diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/ft2.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/ft2.js
index c682b6d6..583fcf06 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/ft2.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/ft2.js
@@ -1,195 +1,170 @@
 "use strict";
-function ft8RenderMessageFt2(message) {
-  if (typeof renderFt8Message === "function") return renderFt8Message(message);
-  if (typeof ft8EscapeHtml === "function") return ft8EscapeHtml(message);
-  return message;
-}
-const ft2Status = document.getElementById("ft2-status");
-const ft2PeriodEl = document.getElementById("ft2-period");
-const ft2MessagesEl = document.getElementById("ft2-messages");
-const ft2FilterInput = document.getElementById("ft2-filter");
-const FT2_PERIOD_MS = 3750;
-const FT2_MAX_DOM_ROWS = 200;
-let ft2FilterText = "";
-let ft2MessageHistory = [];
-function currentFt2HistoryRetentionMs() {
-  return typeof window.getDecodeHistoryRetentionMs === "function" ? window.getDecodeHistoryRetentionMs() : 24 * 60 * 60 * 1e3;
-}
-function pruneFt2MessageHistory() {
-  const cutoffMs = Date.now() - currentFt2HistoryRetentionMs();
-  ft2MessageHistory = ft2MessageHistory.filter((msg) => Number(msg?._tsMs ?? msg?.ts_ms) >= cutoffMs);
-}
-function scheduleFt2Ui(key, job) {
-  if (typeof window.trxScheduleUiFrameJob === "function") {
-    window.trxScheduleUiFrameJob(key, job);
-    return;
+(() => {
+  // src/plugins/ftx-family.ts
+  var bridge = window;
+  function finiteNumber(value) {
+    const number = typeof value === "number" ? value : Number(value);
+    return Number.isFinite(number) ? number : null;
   }
-  job();
-}
-function scheduleFt2HistoryRender() {
-  scheduleFt2Ui("ft2-history", () => renderFt2History());
-}
-function normalizeFt2DisplayFreqHz(freqHz) {
-  const rawHz = Number(freqHz);
-  if (!Number.isFinite(rawHz)) return null;
-  const baseHz = Number.isFinite(window.ft8BaseHz) ? Number(window.ft8BaseHz) : null;
-  if (Number.isFinite(baseHz) && baseHz > 0 && rawHz >= 0 && rawHz < 1e5) {
-    return baseHz + rawHz;
+  function initializeFtxDecoder(config) {
+    const { id, label, periodMs } = config;
+    const status = document.getElementById(`${id}-status`);
+    const period = document.getElementById(`${id}-period`);
+    const messagesElement = document.getElementById(`${id}-messages`);
+    const filterInput = document.getElementById(`${id}-filter`);
+    let filterText = "";
+    let history = [];
+    const renderMessage = (message) => {
+      if (bridge.renderFt8Message) return bridge.renderFt8Message(message);
+      if (bridge.ft8EscapeHtml) return bridge.ft8EscapeHtml(message);
+      return message;
+    };
+    const retentionMs = () => bridge.getDecodeHistoryRetentionMs?.() ?? 864e5;
+    const prune = () => {
+      const cutoff = Date.now() - retentionMs();
+      history = history.filter((message) => (finiteNumber(message._tsMs ?? message.ts_ms) ?? 0) >= cutoff);
+    };
+    const schedule = (job) => {
+      if (bridge.trxScheduleUiFrameJob) bridge.trxScheduleUiFrameJob(`${id}-history`, job);
+      else job();
+    };
+    const displayFrequency = (value) => {
+      const raw = finiteNumber(value);
+      if (raw === null) return null;
+      const base = finiteNumber(bridge.ft8BaseHz);
+      return base !== null && base > 0 && raw >= 0 && raw < 1e5 ? base + raw : raw;
+    };
+    const renderRow = (message) => {
+      const row = document.createElement("div");
+      row.className = "ft8-row";
+      const raw = message.message ?? "";
+      row.dataset.message = raw.toUpperCase();
+      row.dataset.decoder = id;
+      const storedFrequency = finiteNumber(message.freq_hz);
+      row.dataset.storedFreqHz = storedFrequency === null ? "" : String(storedFrequency);
+      const snr = finiteNumber(message.snr_db);
+      const delta = finiteNumber(message.dt_s);
+      const frequency = displayFrequency(message.freq_hz);
+      const timestamp = finiteNumber(message._tsMs ?? message.ts_ms);
+      const time = timestamp === null ? "--:--:--" : new Date(timestamp).toLocaleTimeString([], {
+        hour: "2-digit",
+        minute: "2-digit",
+        second: "2-digit"
+      });
+      row.innerHTML = `<span class="ft8-time">${time}</span><span class="ft8-snr">${snr?.toFixed(1) ?? "--"}</span><span class="ft8-dt">${delta?.toFixed(2) ?? "--"}</span><span class="ft8-freq">${frequency?.toFixed(0) ?? "--"}</span><span class="ft8-msg">${renderMessage(raw)}</span>`;
+      return row;
+    };
+    const render = () => {
+      prune();
+      if (!messagesElement) return;
+      const fragment = document.createDocumentFragment();
+      let count = 0;
+      for (const message of history) {
+        if (count >= 200) break;
+        if (filterText && !(message.message ?? "").toUpperCase().includes(filterText)) continue;
+        fragment.appendChild(renderRow(message));
+        count += 1;
+      }
+      messagesElement.replaceChildren(fragment);
+    };
+    const normalize = (message) => {
+      const raw = message.message ?? "";
+      const locatorDetails = bridge.ft8ExtractLocatorDetails?.(raw) ?? [];
+      const grids = locatorDetails.length > 0 ? locatorDetails.map(({ grid }) => grid) : bridge.ft8ExtractAllGrids?.(raw) ?? [];
+      const station = bridge.ft8ExtractLikelyCallsign?.(raw) ?? null;
+      const frequency = displayFrequency(message.freq_hz);
+      if (grids.length > 0) {
+        bridge.mapAddLocator?.(raw, grids, id, station, {
+          ...message,
+          freq_hz: frequency ?? message.freq_hz,
+          locator_details: locatorDetails
+        });
+      }
+      return {
+        receiver: bridge.getDecodeRigMeta?.() ?? null,
+        ts_ms: message.ts_ms,
+        snr_db: message.snr_db,
+        dt_s: message.dt_s,
+        freq_hz: frequency ?? message.freq_hz,
+        message: message.message,
+        _tsMs: finiteNumber(message.ts_ms) ?? Date.now()
+      };
+    };
+    const receiveBatch = (messages) => {
+      if (messages.length === 0) return;
+      if (status) status.textContent = "Receiving";
+      history = messages.map(normalize).reverse().concat(history);
+      prune();
+      bridge.setFt8FamilyBarDecoder?.(id);
+      bridge.updateFt8Bar?.();
+      schedule(render);
+    };
+    const reset = () => {
+      history = [];
+      bridge.updateFt8Bar?.();
+      render();
+    };
+    const barFrames = () => {
+      const recent = history.filter((message) => (finiteNumber(message._tsMs ?? message.ts_ms) ?? 0) >= Date.now() - 9e5).slice(0, 8);
+      let html = "";
+      for (const message of recent) {
+        const timestamp = finiteNumber(message._tsMs ?? message.ts_ms);
+        const time = timestamp === null ? "" : `<span class="aprs-bar-time">${bridge.fmtTime?.(timestamp) ?? ""}</span>`;
+        const snr = finiteNumber(message.snr_db);
+        const delta = finiteNumber(message.dt_s);
+        const frequency = displayFrequency(message.freq_hz);
+        const detail = [snr === null ? "-- dB" : `${snr.toFixed(1)} dB`, delta === null ? null : `dt ${delta.toFixed(2)}`, frequency === null ? null : `${frequency.toFixed(0)} Hz`].filter((part) => part !== null).join(" · ");
+        html += `<div class="aprs-bar-frame"><div class="aprs-bar-frame-main">${time}<span class="aprs-bar-call">${renderMessage(message.message ?? "")}</span>${detail ? ` · ${detail}` : ""}</div></div>`;
+      }
+      return { count: recent.length, newestTsMs: recent.reduce((latest, message) => Math.max(latest, finiteNumber(message._tsMs ?? message.ts_ms) ?? 0), 0), html };
+    };
+    const capitalized = `${id[0]?.toUpperCase() ?? ""}${id.slice(1)}`;
+    bridge[`onServer${capitalized}Batch`] = (messages) => {
+      if (Array.isArray(messages)) receiveBatch(messages);
+    };
+    bridge[`restore${capitalized}History`] = receiveBatch;
+    bridge[`prune${capitalized}HistoryView`] = () => {
+      prune();
+      render();
+    };
+    bridge[`reset${capitalized}HistoryView`] = reset;
+    bridge[`onServer${capitalized}`] = (message) => {
+      receiveBatch([message]);
+    };
+    bridge.registerFt8FamilyBarRenderer?.(id, barFrames);
+    const updatePeriod = () => {
+      if (period) period.textContent = `Next slot ${((periodMs - Date.now() % periodMs) / 1e3).toFixed(1)}s`;
+    };
+    updatePeriod();
+    window.setInterval(updatePeriod, 250);
+    filterInput?.addEventListener("input", () => {
+      filterText = filterInput.value.trim().toUpperCase();
+      render();
+    });
+    const toggle = document.getElementById(`${id}-decode-toggle-btn`);
+    toggle?.addEventListener("click", () => {
+      void (async () => {
+        try {
+          await bridge.takeSchedulerControlForDecoderDisable?.(toggle);
+          await bridge.postPath?.(`/toggle_${id}_decode`);
+        } catch (error) {
+          console.error(`${label} toggle failed`, error);
+        }
+      })();
+    });
+    document.getElementById(`settings-clear-${id}-history`)?.addEventListener("click", () => {
+      void (async () => {
+        if (!await bridge.trxUi.confirm({ title: `Clear ${label} history?`, message: `All stored ${label} decodes will be permanently removed.`, confirmLabel: "Clear history" })) return;
+        try {
+          await bridge.postPath?.(`/clear_${id}_decode`);
+          reset();
+        } catch (error) {
+          console.error(`${label} history clear failed`, error);
+        }
+      })();
+    });
   }
-  return rawHz;
-}
-function updateFt2PeriodTimer() {
-  if (!ft2PeriodEl) return;
-  const nowMs = Date.now();
-  const remaining = (FT2_PERIOD_MS - nowMs % FT2_PERIOD_MS) / 1e3;
-  ft2PeriodEl.textContent = `Next slot ${remaining.toFixed(1)}s`;
-}
-updateFt2PeriodTimer();
-setInterval(updateFt2PeriodTimer, 250);
-function renderFt2Row(msg) {
-  const row = document.createElement("div");
-  row.className = "ft8-row";
-  const rawMessage = (msg.message || "").toString();
-  row.dataset.message = rawMessage.toUpperCase();
-  row.dataset.decoder = "ft2";
-  row.dataset.storedFreqHz = Number.isFinite(msg.freq_hz) ? String(msg.freq_hz) : "";
-  const snr = Number.isFinite(msg.snr_db) ? msg.snr_db.toFixed(1) : "--";
-  const dt = Number.isFinite(msg.dt_s) ? msg.dt_s.toFixed(2) : "--";
-  const displayFreqHz = normalizeFt2DisplayFreqHz(msg.freq_hz);
-  const freq = Number.isFinite(displayFreqHz) ? displayFreqHz.toFixed(0) : "--";
-  const renderedMessage = ft8RenderMessageFt2(rawMessage);
-  const tsMs = msg._tsMs ?? msg.ts_ms;
-  const timeStr = tsMs ? new Date(tsMs).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit", second: "2-digit" }) : "--:--:--";
-  row.innerHTML = `<span class="ft8-time">${timeStr}</span><span class="ft8-snr">${snr}</span><span class="ft8-dt">${dt}</span><span class="ft8-freq">${freq}</span><span class="ft8-msg">${renderedMessage}</span>`;
-  return row;
-}
-function renderFt2History() {
-  pruneFt2MessageHistory();
-  if (!ft2MessagesEl) return;
-  const filter = ft2FilterText;
-  const fragment = document.createDocumentFragment();
-  let rendered = 0;
-  for (let i = 0; i < ft2MessageHistory.length && rendered < FT2_MAX_DOM_ROWS; i++) {
-    const msg = ft2MessageHistory[i];
-    if (filter && !(msg.message || "").toString().toUpperCase().includes(filter)) continue;
-    fragment.appendChild(renderFt2Row(msg));
-    rendered++;
-  }
-  ft2MessagesEl.replaceChildren(fragment);
-}
-function addFt2Message(msg) {
-  msg._tsMs = Number.isFinite(msg?.ts_ms) ? Number(msg.ts_ms) : Date.now();
-  ft2MessageHistory.unshift(msg);
-  pruneFt2MessageHistory();
-  window.setFt8FamilyBarDecoder?.("ft2");
-  window.updateFt8Bar?.();
-  scheduleFt2HistoryRender();
-}
-function normalizeServerFt2Message(msg) {
-  const raw = (msg.message || "").toString();
-  const locatorDetails = typeof ft8ExtractLocatorDetails === "function" ? ft8ExtractLocatorDetails(raw) : [];
-  const grids = locatorDetails.length > 0 ? locatorDetails.map((d) => d.grid) : typeof ft8ExtractAllGrids === "function" ? ft8ExtractAllGrids(raw) : [];
-  const station = typeof ft8ExtractLikelyCallsign === "function" ? ft8ExtractLikelyCallsign(raw) : null;
-  const rfHz = normalizeFt2DisplayFreqHz(msg.freq_hz);
-  return {
-    raw,
-    grids,
-    station,
-    rfHz,
-    locatorDetails,
-    history: {
-      receiver: window.getDecodeRigMeta ? window.getDecodeRigMeta() : null,
-      ts_ms: msg.ts_ms,
-      snr_db: msg.snr_db,
-      dt_s: msg.dt_s,
-      freq_hz: Number.isFinite(rfHz) ? rfHz : msg.freq_hz,
-      message: msg.message
-    }
-  };
-}
-window.onServerFt2Batch = function(messages) {
-  if (!Array.isArray(messages) || messages.length === 0) return;
-  if (ft2Status) ft2Status.textContent = "Receiving";
-  const normalized = [];
-  for (const msg of messages) {
-    const next = normalizeServerFt2Message(msg);
-    if (next.grids.length > 0 && window.mapAddLocator) {
-      window.mapAddLocator(next.raw, next.grids, "ft2", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
-    }
-    next.history._tsMs = Number.isFinite(next.history?.ts_ms) ? Number(next.history.ts_ms) : Date.now();
-    normalized.push(next.history);
-  }
-  normalized.reverse();
-  ft2MessageHistory = normalized.concat(ft2MessageHistory);
-  pruneFt2MessageHistory();
-  window.setFt8FamilyBarDecoder?.("ft2");
-  window.updateFt8Bar?.();
-  scheduleFt2HistoryRender();
-};
-window.restoreFt2History = function(messages) {
-  window.onServerFt2Batch(messages);
-};
-window.pruneFt2HistoryView = function() {
-  pruneFt2MessageHistory();
-  renderFt2History();
-};
-window.resetFt2HistoryView = function() {
-  if (ft2MessagesEl) ft2MessagesEl.innerHTML = "";
-  ft2MessageHistory = [];
-  window.updateFt8Bar?.();
-  renderFt2History();
-};
-function buildFt2BarFrames() {
-  const cutoffMs = Date.now() - 15 * 60 * 1e3;
-  const messages = ft2MessageHistory.filter((msg) => Number(msg._tsMs ?? msg.ts_ms) >= cutoffMs).slice(0, 8);
-  const newestTsMs = messages.reduce((latest, msg) => Math.max(latest, Number(msg._tsMs ?? msg.ts_ms) || 0), 0);
-  if (messages.length === 0) {
-    return { count: 0, newestTsMs: 0, html: "" };
-  }
-  let html = "";
-  for (const msg of messages) {
-    const tsMs = msg._tsMs ?? msg.ts_ms;
-    const ts = tsMs ? `<span class="aprs-bar-time">${fmtTime(tsMs)}</span>` : "";
-    const snr = Number.isFinite(msg.snr_db) ? `${msg.snr_db.toFixed(1)} dB` : "-- dB";
-    const dt = Number.isFinite(msg.dt_s) ? `dt ${msg.dt_s.toFixed(2)}` : null;
-    const displayFreqHz = normalizeFt2DisplayFreqHz(msg.freq_hz);
-    const rf = Number.isFinite(displayFreqHz) ? `${displayFreqHz.toFixed(0)} Hz` : null;
-    const detail = [snr, dt, rf].filter(Boolean).join(" · ");
-    const text = ft8RenderMessageFt2((msg.message || "").toString());
-    html += `<div class="aprs-bar-frame"><div class="aprs-bar-frame-main">${ts}<span class="aprs-bar-call">${text}</span>${detail ? ` · ${detail}` : ""}</div></div>`;
-  }
-  return { count: messages.length, newestTsMs, html };
-}
-window.registerFt8FamilyBarRenderer?.("ft2", buildFt2BarFrames);
-if (ft2FilterInput) {
-  ft2FilterInput.addEventListener("input", () => {
-    ft2FilterText = ft2FilterInput.value.trim().toUpperCase();
-    renderFt2History();
-  });
-}
-const ft2DecodeToggleBtn = document.getElementById("ft2-decode-toggle-btn");
-ft2DecodeToggleBtn?.addEventListener("click", async () => {
-  try {
-    await window.takeSchedulerControlForDecoderDisable?.(ft2DecodeToggleBtn);
-    await postPath("/toggle_ft2_decode");
-  } catch (e) {
-    console.error("FT2 toggle failed", e);
-  }
-});
-document.getElementById("settings-clear-ft2-history")?.addEventListener("click", async () => {
-  if (!await window.trxUi.confirm({ title: "Clear FT2 history?", message: "All stored FT2 decodes will be permanently removed.", confirmLabel: "Clear history" })) return;
-  try {
-    await postPath("/clear_ft2_decode");
-    window.resetFt2HistoryView();
-  } catch (e) {
-    console.error("FT2 history clear failed", e);
-  }
-});
-window.onServerFt2 = function(msg) {
-  if (ft2Status) ft2Status.textContent = "Receiving";
-  const next = normalizeServerFt2Message(msg);
-  if (next.grids.length > 0 && window.mapAddLocator) {
-    window.mapAddLocator(next.raw, next.grids, "ft2", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
-  }
-  addFt2Message(next.history);
-};
+
+  // src/plugins/ft2.ts
+  initializeFtxDecoder({ id: "ft2", label: "FT2", periodMs: 3750 });
+})();
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/ft4.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/ft4.js
index 4387020e..4c03f942 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/ft4.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/ft4.js
@@ -1,195 +1,170 @@
 "use strict";
-function ft8RenderMessage(message) {
-  if (typeof renderFt8Message === "function") return renderFt8Message(message);
-  if (typeof ft8EscapeHtml === "function") return ft8EscapeHtml(message);
-  return message;
-}
-const ft4Status = document.getElementById("ft4-status");
-const ft4PeriodEl = document.getElementById("ft4-period");
-const ft4MessagesEl = document.getElementById("ft4-messages");
-const ft4FilterInput = document.getElementById("ft4-filter");
-const FT4_PERIOD_MS = 7500;
-const FT4_MAX_DOM_ROWS = 200;
-let ft4FilterText = "";
-let ft4MessageHistory = [];
-function currentFt4HistoryRetentionMs() {
-  return typeof window.getDecodeHistoryRetentionMs === "function" ? window.getDecodeHistoryRetentionMs() : 24 * 60 * 60 * 1e3;
-}
-function pruneFt4MessageHistory() {
-  const cutoffMs = Date.now() - currentFt4HistoryRetentionMs();
-  ft4MessageHistory = ft4MessageHistory.filter((msg) => Number(msg?._tsMs ?? msg?.ts_ms) >= cutoffMs);
-}
-function scheduleFt4Ui(key, job) {
-  if (typeof window.trxScheduleUiFrameJob === "function") {
-    window.trxScheduleUiFrameJob(key, job);
-    return;
+(() => {
+  // src/plugins/ftx-family.ts
+  var bridge = window;
+  function finiteNumber(value) {
+    const number = typeof value === "number" ? value : Number(value);
+    return Number.isFinite(number) ? number : null;
   }
-  job();
-}
-function scheduleFt4HistoryRender() {
-  scheduleFt4Ui("ft4-history", () => renderFt4History());
-}
-function normalizeFt4DisplayFreqHz(freqHz) {
-  const rawHz = Number(freqHz);
-  if (!Number.isFinite(rawHz)) return null;
-  const baseHz = Number.isFinite(window.ft8BaseHz) ? Number(window.ft8BaseHz) : null;
-  if (Number.isFinite(baseHz) && baseHz > 0 && rawHz >= 0 && rawHz < 1e5) {
-    return baseHz + rawHz;
+  function initializeFtxDecoder(config) {
+    const { id, label, periodMs } = config;
+    const status = document.getElementById(`${id}-status`);
+    const period = document.getElementById(`${id}-period`);
+    const messagesElement = document.getElementById(`${id}-messages`);
+    const filterInput = document.getElementById(`${id}-filter`);
+    let filterText = "";
+    let history = [];
+    const renderMessage = (message) => {
+      if (bridge.renderFt8Message) return bridge.renderFt8Message(message);
+      if (bridge.ft8EscapeHtml) return bridge.ft8EscapeHtml(message);
+      return message;
+    };
+    const retentionMs = () => bridge.getDecodeHistoryRetentionMs?.() ?? 864e5;
+    const prune = () => {
+      const cutoff = Date.now() - retentionMs();
+      history = history.filter((message) => (finiteNumber(message._tsMs ?? message.ts_ms) ?? 0) >= cutoff);
+    };
+    const schedule = (job) => {
+      if (bridge.trxScheduleUiFrameJob) bridge.trxScheduleUiFrameJob(`${id}-history`, job);
+      else job();
+    };
+    const displayFrequency = (value) => {
+      const raw = finiteNumber(value);
+      if (raw === null) return null;
+      const base = finiteNumber(bridge.ft8BaseHz);
+      return base !== null && base > 0 && raw >= 0 && raw < 1e5 ? base + raw : raw;
+    };
+    const renderRow = (message) => {
+      const row = document.createElement("div");
+      row.className = "ft8-row";
+      const raw = message.message ?? "";
+      row.dataset.message = raw.toUpperCase();
+      row.dataset.decoder = id;
+      const storedFrequency = finiteNumber(message.freq_hz);
+      row.dataset.storedFreqHz = storedFrequency === null ? "" : String(storedFrequency);
+      const snr = finiteNumber(message.snr_db);
+      const delta = finiteNumber(message.dt_s);
+      const frequency = displayFrequency(message.freq_hz);
+      const timestamp = finiteNumber(message._tsMs ?? message.ts_ms);
+      const time = timestamp === null ? "--:--:--" : new Date(timestamp).toLocaleTimeString([], {
+        hour: "2-digit",
+        minute: "2-digit",
+        second: "2-digit"
+      });
+      row.innerHTML = `<span class="ft8-time">${time}</span><span class="ft8-snr">${snr?.toFixed(1) ?? "--"}</span><span class="ft8-dt">${delta?.toFixed(2) ?? "--"}</span><span class="ft8-freq">${frequency?.toFixed(0) ?? "--"}</span><span class="ft8-msg">${renderMessage(raw)}</span>`;
+      return row;
+    };
+    const render = () => {
+      prune();
+      if (!messagesElement) return;
+      const fragment = document.createDocumentFragment();
+      let count = 0;
+      for (const message of history) {
+        if (count >= 200) break;
+        if (filterText && !(message.message ?? "").toUpperCase().includes(filterText)) continue;
+        fragment.appendChild(renderRow(message));
+        count += 1;
+      }
+      messagesElement.replaceChildren(fragment);
+    };
+    const normalize = (message) => {
+      const raw = message.message ?? "";
+      const locatorDetails = bridge.ft8ExtractLocatorDetails?.(raw) ?? [];
+      const grids = locatorDetails.length > 0 ? locatorDetails.map(({ grid }) => grid) : bridge.ft8ExtractAllGrids?.(raw) ?? [];
+      const station = bridge.ft8ExtractLikelyCallsign?.(raw) ?? null;
+      const frequency = displayFrequency(message.freq_hz);
+      if (grids.length > 0) {
+        bridge.mapAddLocator?.(raw, grids, id, station, {
+          ...message,
+          freq_hz: frequency ?? message.freq_hz,
+          locator_details: locatorDetails
+        });
+      }
+      return {
+        receiver: bridge.getDecodeRigMeta?.() ?? null,
+        ts_ms: message.ts_ms,
+        snr_db: message.snr_db,
+        dt_s: message.dt_s,
+        freq_hz: frequency ?? message.freq_hz,
+        message: message.message,
+        _tsMs: finiteNumber(message.ts_ms) ?? Date.now()
+      };
+    };
+    const receiveBatch = (messages) => {
+      if (messages.length === 0) return;
+      if (status) status.textContent = "Receiving";
+      history = messages.map(normalize).reverse().concat(history);
+      prune();
+      bridge.setFt8FamilyBarDecoder?.(id);
+      bridge.updateFt8Bar?.();
+      schedule(render);
+    };
+    const reset = () => {
+      history = [];
+      bridge.updateFt8Bar?.();
+      render();
+    };
+    const barFrames = () => {
+      const recent = history.filter((message) => (finiteNumber(message._tsMs ?? message.ts_ms) ?? 0) >= Date.now() - 9e5).slice(0, 8);
+      let html = "";
+      for (const message of recent) {
+        const timestamp = finiteNumber(message._tsMs ?? message.ts_ms);
+        const time = timestamp === null ? "" : `<span class="aprs-bar-time">${bridge.fmtTime?.(timestamp) ?? ""}</span>`;
+        const snr = finiteNumber(message.snr_db);
+        const delta = finiteNumber(message.dt_s);
+        const frequency = displayFrequency(message.freq_hz);
+        const detail = [snr === null ? "-- dB" : `${snr.toFixed(1)} dB`, delta === null ? null : `dt ${delta.toFixed(2)}`, frequency === null ? null : `${frequency.toFixed(0)} Hz`].filter((part) => part !== null).join(" · ");
+        html += `<div class="aprs-bar-frame"><div class="aprs-bar-frame-main">${time}<span class="aprs-bar-call">${renderMessage(message.message ?? "")}</span>${detail ? ` · ${detail}` : ""}</div></div>`;
+      }
+      return { count: recent.length, newestTsMs: recent.reduce((latest, message) => Math.max(latest, finiteNumber(message._tsMs ?? message.ts_ms) ?? 0), 0), html };
+    };
+    const capitalized = `${id[0]?.toUpperCase() ?? ""}${id.slice(1)}`;
+    bridge[`onServer${capitalized}Batch`] = (messages) => {
+      if (Array.isArray(messages)) receiveBatch(messages);
+    };
+    bridge[`restore${capitalized}History`] = receiveBatch;
+    bridge[`prune${capitalized}HistoryView`] = () => {
+      prune();
+      render();
+    };
+    bridge[`reset${capitalized}HistoryView`] = reset;
+    bridge[`onServer${capitalized}`] = (message) => {
+      receiveBatch([message]);
+    };
+    bridge.registerFt8FamilyBarRenderer?.(id, barFrames);
+    const updatePeriod = () => {
+      if (period) period.textContent = `Next slot ${((periodMs - Date.now() % periodMs) / 1e3).toFixed(1)}s`;
+    };
+    updatePeriod();
+    window.setInterval(updatePeriod, 250);
+    filterInput?.addEventListener("input", () => {
+      filterText = filterInput.value.trim().toUpperCase();
+      render();
+    });
+    const toggle = document.getElementById(`${id}-decode-toggle-btn`);
+    toggle?.addEventListener("click", () => {
+      void (async () => {
+        try {
+          await bridge.takeSchedulerControlForDecoderDisable?.(toggle);
+          await bridge.postPath?.(`/toggle_${id}_decode`);
+        } catch (error) {
+          console.error(`${label} toggle failed`, error);
+        }
+      })();
+    });
+    document.getElementById(`settings-clear-${id}-history`)?.addEventListener("click", () => {
+      void (async () => {
+        if (!await bridge.trxUi.confirm({ title: `Clear ${label} history?`, message: `All stored ${label} decodes will be permanently removed.`, confirmLabel: "Clear history" })) return;
+        try {
+          await bridge.postPath?.(`/clear_${id}_decode`);
+          reset();
+        } catch (error) {
+          console.error(`${label} history clear failed`, error);
+        }
+      })();
+    });
   }
-  return rawHz;
-}
-function updateFt4PeriodTimer() {
-  if (!ft4PeriodEl) return;
-  const nowMs = Date.now();
-  const remaining = (FT4_PERIOD_MS - nowMs % FT4_PERIOD_MS) / 1e3;
-  ft4PeriodEl.textContent = `Next slot ${remaining.toFixed(1)}s`;
-}
-updateFt4PeriodTimer();
-setInterval(updateFt4PeriodTimer, 250);
-function renderFt4Row(msg) {
-  const row = document.createElement("div");
-  row.className = "ft8-row";
-  const rawMessage = (msg.message || "").toString();
-  row.dataset.message = rawMessage.toUpperCase();
-  row.dataset.decoder = "ft4";
-  row.dataset.storedFreqHz = Number.isFinite(msg.freq_hz) ? String(msg.freq_hz) : "";
-  const snr = Number.isFinite(msg.snr_db) ? msg.snr_db.toFixed(1) : "--";
-  const dt = Number.isFinite(msg.dt_s) ? msg.dt_s.toFixed(2) : "--";
-  const displayFreqHz = normalizeFt4DisplayFreqHz(msg.freq_hz);
-  const freq = Number.isFinite(displayFreqHz) ? displayFreqHz.toFixed(0) : "--";
-  const renderedMessage = ft8RenderMessage(rawMessage);
-  const tsMs = msg._tsMs ?? msg.ts_ms;
-  const timeStr = tsMs ? new Date(tsMs).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit", second: "2-digit" }) : "--:--:--";
-  row.innerHTML = `<span class="ft8-time">${timeStr}</span><span class="ft8-snr">${snr}</span><span class="ft8-dt">${dt}</span><span class="ft8-freq">${freq}</span><span class="ft8-msg">${renderedMessage}</span>`;
-  return row;
-}
-function renderFt4History() {
-  pruneFt4MessageHistory();
-  if (!ft4MessagesEl) return;
-  const filter = ft4FilterText;
-  const fragment = document.createDocumentFragment();
-  let rendered = 0;
-  for (let i = 0; i < ft4MessageHistory.length && rendered < FT4_MAX_DOM_ROWS; i++) {
-    const msg = ft4MessageHistory[i];
-    if (filter && !(msg.message || "").toString().toUpperCase().includes(filter)) continue;
-    fragment.appendChild(renderFt4Row(msg));
-    rendered++;
-  }
-  ft4MessagesEl.replaceChildren(fragment);
-}
-function addFt4Message(msg) {
-  msg._tsMs = Number.isFinite(msg?.ts_ms) ? Number(msg.ts_ms) : Date.now();
-  ft4MessageHistory.unshift(msg);
-  pruneFt4MessageHistory();
-  window.setFt8FamilyBarDecoder?.("ft4");
-  window.updateFt8Bar?.();
-  scheduleFt4HistoryRender();
-}
-function normalizeServerFt4Message(msg) {
-  const raw = (msg.message || "").toString();
-  const locatorDetails = typeof ft8ExtractLocatorDetails === "function" ? ft8ExtractLocatorDetails(raw) : [];
-  const grids = locatorDetails.length > 0 ? locatorDetails.map((d) => d.grid) : typeof ft8ExtractAllGrids === "function" ? ft8ExtractAllGrids(raw) : [];
-  const station = typeof ft8ExtractLikelyCallsign === "function" ? ft8ExtractLikelyCallsign(raw) : null;
-  const rfHz = normalizeFt4DisplayFreqHz(msg.freq_hz);
-  return {
-    raw,
-    grids,
-    station,
-    rfHz,
-    locatorDetails,
-    history: {
-      receiver: window.getDecodeRigMeta ? window.getDecodeRigMeta() : null,
-      ts_ms: msg.ts_ms,
-      snr_db: msg.snr_db,
-      dt_s: msg.dt_s,
-      freq_hz: Number.isFinite(rfHz) ? rfHz : msg.freq_hz,
-      message: msg.message
-    }
-  };
-}
-window.onServerFt4Batch = function(messages) {
-  if (!Array.isArray(messages) || messages.length === 0) return;
-  if (ft4Status) ft4Status.textContent = "Receiving";
-  const normalized = [];
-  for (const msg of messages) {
-    const next = normalizeServerFt4Message(msg);
-    if (next.grids.length > 0 && window.mapAddLocator) {
-      window.mapAddLocator(next.raw, next.grids, "ft4", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
-    }
-    next.history._tsMs = Number.isFinite(next.history?.ts_ms) ? Number(next.history.ts_ms) : Date.now();
-    normalized.push(next.history);
-  }
-  normalized.reverse();
-  ft4MessageHistory = normalized.concat(ft4MessageHistory);
-  pruneFt4MessageHistory();
-  window.setFt8FamilyBarDecoder?.("ft4");
-  window.updateFt8Bar?.();
-  scheduleFt4HistoryRender();
-};
-window.restoreFt4History = function(messages) {
-  window.onServerFt4Batch(messages);
-};
-window.pruneFt4HistoryView = function() {
-  pruneFt4MessageHistory();
-  renderFt4History();
-};
-window.resetFt4HistoryView = function() {
-  if (ft4MessagesEl) ft4MessagesEl.innerHTML = "";
-  ft4MessageHistory = [];
-  window.updateFt8Bar?.();
-  renderFt4History();
-};
-function buildFt4BarFrames() {
-  const cutoffMs = Date.now() - 15 * 60 * 1e3;
-  const messages = ft4MessageHistory.filter((msg) => Number(msg._tsMs ?? msg.ts_ms) >= cutoffMs).slice(0, 8);
-  const newestTsMs = messages.reduce((latest, msg) => Math.max(latest, Number(msg._tsMs ?? msg.ts_ms) || 0), 0);
-  if (messages.length === 0) {
-    return { count: 0, newestTsMs: 0, html: "" };
-  }
-  let html = "";
-  for (const msg of messages) {
-    const tsMs = msg._tsMs ?? msg.ts_ms;
-    const ts = tsMs ? `<span class="aprs-bar-time">${fmtTime(tsMs)}</span>` : "";
-    const snr = Number.isFinite(msg.snr_db) ? `${msg.snr_db.toFixed(1)} dB` : "-- dB";
-    const dt = Number.isFinite(msg.dt_s) ? `dt ${msg.dt_s.toFixed(2)}` : null;
-    const displayFreqHz = normalizeFt4DisplayFreqHz(msg.freq_hz);
-    const rf = Number.isFinite(displayFreqHz) ? `${displayFreqHz.toFixed(0)} Hz` : null;
-    const detail = [snr, dt, rf].filter(Boolean).join(" · ");
-    const text = ft8RenderMessage((msg.message || "").toString());
-    html += `<div class="aprs-bar-frame"><div class="aprs-bar-frame-main">${ts}<span class="aprs-bar-call">${text}</span>${detail ? ` · ${detail}` : ""}</div></div>`;
-  }
-  return { count: messages.length, newestTsMs, html };
-}
-window.registerFt8FamilyBarRenderer?.("ft4", buildFt4BarFrames);
-if (ft4FilterInput) {
-  ft4FilterInput.addEventListener("input", () => {
-    ft4FilterText = ft4FilterInput.value.trim().toUpperCase();
-    renderFt4History();
-  });
-}
-const ft4DecodeToggleBtn = document.getElementById("ft4-decode-toggle-btn");
-ft4DecodeToggleBtn?.addEventListener("click", async () => {
-  try {
-    await window.takeSchedulerControlForDecoderDisable?.(ft4DecodeToggleBtn);
-    await postPath("/toggle_ft4_decode");
-  } catch (e) {
-    console.error("FT4 toggle failed", e);
-  }
-});
-document.getElementById("settings-clear-ft4-history")?.addEventListener("click", async () => {
-  if (!await window.trxUi.confirm({ title: "Clear FT4 history?", message: "All stored FT4 decodes will be permanently removed.", confirmLabel: "Clear history" })) return;
-  try {
-    await postPath("/clear_ft4_decode");
-    window.resetFt4HistoryView();
-  } catch (e) {
-    console.error("FT4 history clear failed", e);
-  }
-});
-window.onServerFt4 = function(msg) {
-  if (ft4Status) ft4Status.textContent = "Receiving";
-  const next = normalizeServerFt4Message(msg);
-  if (next.grids.length > 0 && window.mapAddLocator) {
-    window.mapAddLocator(next.raw, next.grids, "ft4", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
-  }
-  addFt4Message(next.history);
-};
+
+  // src/plugins/ft4.ts
+  initializeFtxDecoder({ id: "ft4", label: "FT4", periodMs: 7500 });
+})();
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/build.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/build.mjs
index bd20a092..8a1825ef 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/build.mjs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/build.mjs
@@ -27,8 +27,6 @@ await build({
     "background-decode": path.join(sourceDir, "plugins", "background-decode.js"),
     bookmarks: path.join(sourceDir, "plugins", "bookmarks.js"),
     cw: path.join(sourceDir, "plugins", "cw.js"),
-    ft2: path.join(sourceDir, "plugins", "ft2.js"),
-    ft4: path.join(sourceDir, "plugins", "ft4.js"),
     ft8: path.join(sourceDir, "plugins", "ft8.js"),
     "hf-aprs": path.join(sourceDir, "plugins", "hf-aprs.js"),
     sat: path.join(sourceDir, "plugins", "sat.js"),
@@ -48,6 +46,22 @@ await build({
   logLevel: "info",
 });
 
+await build({
+  entryPoints: {
+    ft2: path.join(sourceDir, "plugins", "ft2.ts"),
+    ft4: path.join(sourceDir, "plugins", "ft4.ts"),
+  },
+  outdir: outputDir,
+  bundle: true,
+  format: "iife",
+  platform: "browser",
+  target: "es2022",
+  sourcemap: false,
+  legalComments: "inline",
+  charset: "utf8",
+  logLevel: "info",
+});
+
 await build({
   entryPoints: [path.join(sourceDir, "decode-history-worker.ts")],
   outfile: path.join(outputDir, "decode-history-worker.js"),
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft2.js b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft2.js
deleted file mode 100644
index cc27230a..00000000
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft2.js
+++ /dev/null
@@ -1,207 +0,0 @@
-// --- FT2 Decoder Plugin (server-side decode) ---
-// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-function ft8RenderMessageFt2(message) {
-  if (typeof renderFt8Message === "function") return renderFt8Message(message);
-  if (typeof ft8EscapeHtml === "function") return ft8EscapeHtml(message);
-  return message;
-}
-
-const ft2Status = document.getElementById("ft2-status");
-const ft2PeriodEl = document.getElementById("ft2-period");
-const ft2MessagesEl = document.getElementById("ft2-messages");
-const ft2FilterInput = document.getElementById("ft2-filter");
-const FT2_PERIOD_MS = 3750;
-const FT2_MAX_DOM_ROWS = 200;
-let ft2FilterText = "";
-let ft2MessageHistory = [];
-
-function currentFt2HistoryRetentionMs() {
-  return typeof window.getDecodeHistoryRetentionMs === "function"
-    ? window.getDecodeHistoryRetentionMs()
-    : 24 * 60 * 60 * 1000;
-}
-
-function pruneFt2MessageHistory() {
-  const cutoffMs = Date.now() - currentFt2HistoryRetentionMs();
-  ft2MessageHistory = ft2MessageHistory.filter((msg) => Number(msg?._tsMs ?? msg?.ts_ms) >= cutoffMs);
-}
-
-function scheduleFt2Ui(key, job) {
-  if (typeof window.trxScheduleUiFrameJob === "function") {
-    window.trxScheduleUiFrameJob(key, job);
-    return;
-  }
-  job();
-}
-
-function scheduleFt2HistoryRender() { scheduleFt2Ui("ft2-history", () => renderFt2History()); }
-
-function normalizeFt2DisplayFreqHz(freqHz) {
-  const rawHz = Number(freqHz);
-  if (!Number.isFinite(rawHz)) return null;
-  const baseHz = Number.isFinite(window.ft8BaseHz) ? Number(window.ft8BaseHz) : null;
-  if (Number.isFinite(baseHz) && baseHz > 0 && rawHz >= 0 && rawHz < 100000) {
-    return baseHz + rawHz;
-  }
-  return rawHz;
-}
-
-function updateFt2PeriodTimer() {
-  if (!ft2PeriodEl) return;
-  const nowMs = Date.now();
-  const remaining = (FT2_PERIOD_MS - nowMs % FT2_PERIOD_MS) / 1000;
-  ft2PeriodEl.textContent = `Next slot ${remaining.toFixed(1)}s`;
-}
-
-updateFt2PeriodTimer();
-setInterval(updateFt2PeriodTimer, 250);
-
-function renderFt2Row(msg) {
-  const row = document.createElement("div");
-  row.className = "ft8-row";
-  const rawMessage = (msg.message || "").toString();
-  row.dataset.message = rawMessage.toUpperCase();
-  row.dataset.decoder = "ft2";
-  row.dataset.storedFreqHz = Number.isFinite(msg.freq_hz) ? String(msg.freq_hz) : "";
-  const snr = Number.isFinite(msg.snr_db) ? msg.snr_db.toFixed(1) : "--";
-  const dt = Number.isFinite(msg.dt_s) ? msg.dt_s.toFixed(2) : "--";
-  const displayFreqHz = normalizeFt2DisplayFreqHz(msg.freq_hz);
-  const freq = Number.isFinite(displayFreqHz) ? displayFreqHz.toFixed(0) : "--";
-  const renderedMessage = ft8RenderMessageFt2(rawMessage);
-  const tsMs = msg._tsMs ?? msg.ts_ms;
-  const timeStr = tsMs ? new Date(tsMs).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit", second: "2-digit" }) : "--:--:--";
-  row.innerHTML = `<span class="ft8-time">${timeStr}</span><span class="ft8-snr">${snr}</span><span class="ft8-dt">${dt}</span><span class="ft8-freq">${freq}</span><span class="ft8-msg">${renderedMessage}</span>`;
-  return row;
-}
-
-function renderFt2History() {
-  pruneFt2MessageHistory();
-  if (!ft2MessagesEl) return;
-  const filter = ft2FilterText;
-  const fragment = document.createDocumentFragment();
-  let rendered = 0;
-  for (let i = 0; i < ft2MessageHistory.length && rendered < FT2_MAX_DOM_ROWS; i++) {
-    const msg = ft2MessageHistory[i];
-    if (filter && !(msg.message || "").toString().toUpperCase().includes(filter)) continue;
-    fragment.appendChild(renderFt2Row(msg));
-    rendered++;
-  }
-  ft2MessagesEl.replaceChildren(fragment);
-}
-
-function addFt2Message(msg) {
-  msg._tsMs = Number.isFinite(msg?.ts_ms) ? Number(msg.ts_ms) : Date.now();
-  ft2MessageHistory.unshift(msg);
-  pruneFt2MessageHistory();
-  window.setFt8FamilyBarDecoder?.("ft2");
-  window.updateFt8Bar?.();
-  scheduleFt2HistoryRender();
-}
-
-function normalizeServerFt2Message(msg) {
-  const raw = (msg.message || "").toString();
-  const locatorDetails = typeof ft8ExtractLocatorDetails === "function" ? ft8ExtractLocatorDetails(raw) : [];
-  const grids = locatorDetails.length > 0
-    ? locatorDetails.map((d) => d.grid)
-    : (typeof ft8ExtractAllGrids === "function" ? ft8ExtractAllGrids(raw) : []);
-  const station = typeof ft8ExtractLikelyCallsign === "function" ? ft8ExtractLikelyCallsign(raw) : null;
-  const rfHz = normalizeFt2DisplayFreqHz(msg.freq_hz);
-  return {
-    raw, grids, station, rfHz, locatorDetails,
-    history: {
-      receiver: window.getDecodeRigMeta ? window.getDecodeRigMeta() : null,
-      ts_ms: msg.ts_ms, snr_db: msg.snr_db, dt_s: msg.dt_s,
-      freq_hz: Number.isFinite(rfHz) ? rfHz : msg.freq_hz,
-      message: msg.message,
-    },
-  };
-}
-
-window.onServerFt2Batch = function(messages) {
-  if (!Array.isArray(messages) || messages.length === 0) return;
-  if (ft2Status) ft2Status.textContent = "Receiving";
-  const normalized = [];
-  for (const msg of messages) {
-    const next = normalizeServerFt2Message(msg);
-    if (next.grids.length > 0 && window.mapAddLocator) {
-      window.mapAddLocator(next.raw, next.grids, "ft2", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
-    }
-    next.history._tsMs = Number.isFinite(next.history?.ts_ms) ? Number(next.history.ts_ms) : Date.now();
-    normalized.push(next.history);
-  }
-  normalized.reverse();
-  ft2MessageHistory = normalized.concat(ft2MessageHistory);
-  pruneFt2MessageHistory();
-  window.setFt8FamilyBarDecoder?.("ft2");
-  window.updateFt8Bar?.();
-  scheduleFt2HistoryRender();
-};
-
-window.restoreFt2History = function(messages) { window.onServerFt2Batch(messages); };
-window.pruneFt2HistoryView = function() { pruneFt2MessageHistory(); renderFt2History(); };
-
-window.resetFt2HistoryView = function() {
-  if (ft2MessagesEl) ft2MessagesEl.innerHTML = "";
-  ft2MessageHistory = [];
-  window.updateFt8Bar?.();
-  renderFt2History();
-};
-
-function buildFt2BarFrames() {
-  const cutoffMs = Date.now() - 15 * 60 * 1000;
-  const messages = ft2MessageHistory.filter((msg) => Number(msg._tsMs ?? msg.ts_ms) >= cutoffMs).slice(0, 8);
-  const newestTsMs = messages.reduce((latest, msg) => Math.max(latest, Number(msg._tsMs ?? msg.ts_ms) || 0), 0);
-  if (messages.length === 0) {
-    return { count: 0, newestTsMs: 0, html: "" };
-  }
-  let html = "";
-  for (const msg of messages) {
-    const tsMs = msg._tsMs ?? msg.ts_ms;
-    const ts = tsMs ? `<span class="aprs-bar-time">${fmtTime(tsMs)}</span>` : "";
-    const snr = Number.isFinite(msg.snr_db) ? `${msg.snr_db.toFixed(1)} dB` : "-- dB";
-    const dt = Number.isFinite(msg.dt_s) ? `dt ${msg.dt_s.toFixed(2)}` : null;
-    const displayFreqHz = normalizeFt2DisplayFreqHz(msg.freq_hz);
-    const rf = Number.isFinite(displayFreqHz) ? `${displayFreqHz.toFixed(0)} Hz` : null;
-    const detail = [snr, dt, rf].filter(Boolean).join(" · ");
-    const text = ft8RenderMessageFt2((msg.message || "").toString());
-    html += `<div class="aprs-bar-frame"><div class="aprs-bar-frame-main">${ts}<span class="aprs-bar-call">${text}</span>${detail ? ` · ${detail}` : ""}</div></div>`;
-  }
-  return { count: messages.length, newestTsMs, html };
-}
-window.registerFt8FamilyBarRenderer?.("ft2", buildFt2BarFrames);
-
-if (ft2FilterInput) {
-  ft2FilterInput.addEventListener("input", () => {
-    ft2FilterText = ft2FilterInput.value.trim().toUpperCase();
-    renderFt2History();
-  });
-}
-
-const ft2DecodeToggleBtn = document.getElementById("ft2-decode-toggle-btn");
-ft2DecodeToggleBtn?.addEventListener("click", async () => {
-  try {
-    await window.takeSchedulerControlForDecoderDisable?.(ft2DecodeToggleBtn);
-    await postPath("/toggle_ft2_decode");
-  } catch (e) {
-    console.error("FT2 toggle failed", e);
-  }
-});
-
-document.getElementById("settings-clear-ft2-history")?.addEventListener("click", async () => {
-  if (!await window.trxUi.confirm({ title: "Clear FT2 history?", message: "All stored FT2 decodes will be permanently removed.", confirmLabel: "Clear history" })) return;
-  try {
-    await postPath("/clear_ft2_decode");
-    window.resetFt2HistoryView();
-  } catch (e) { console.error("FT2 history clear failed", e); }
-});
-
-window.onServerFt2 = function(msg) {
-  if (ft2Status) ft2Status.textContent = "Receiving";
-  const next = normalizeServerFt2Message(msg);
-  if (next.grids.length > 0 && window.mapAddLocator) {
-    window.mapAddLocator(next.raw, next.grids, "ft2", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
-  }
-  addFt2Message(next.history);
-};
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft2.ts b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft2.ts
new file mode 100644
index 00000000..55646137
--- /dev/null
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft2.ts
@@ -0,0 +1,7 @@
+// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import { initializeFtxDecoder } from "./ftx-family";
+
+initializeFtxDecoder({ id: "ft2", label: "FT2", periodMs: 3_750 });
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft4.js b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft4.js
deleted file mode 100644
index 58a07985..00000000
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft4.js
+++ /dev/null
@@ -1,207 +0,0 @@
-// --- FT4 Decoder Plugin (server-side decode) ---
-// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-function ft8RenderMessage(message) {
-  if (typeof renderFt8Message === "function") return renderFt8Message(message);
-  if (typeof ft8EscapeHtml === "function") return ft8EscapeHtml(message);
-  return message;
-}
-
-const ft4Status = document.getElementById("ft4-status");
-const ft4PeriodEl = document.getElementById("ft4-period");
-const ft4MessagesEl = document.getElementById("ft4-messages");
-const ft4FilterInput = document.getElementById("ft4-filter");
-const FT4_PERIOD_MS = 7500;
-const FT4_MAX_DOM_ROWS = 200;
-let ft4FilterText = "";
-let ft4MessageHistory = [];
-
-function currentFt4HistoryRetentionMs() {
-  return typeof window.getDecodeHistoryRetentionMs === "function"
-    ? window.getDecodeHistoryRetentionMs()
-    : 24 * 60 * 60 * 1000;
-}
-
-function pruneFt4MessageHistory() {
-  const cutoffMs = Date.now() - currentFt4HistoryRetentionMs();
-  ft4MessageHistory = ft4MessageHistory.filter((msg) => Number(msg?._tsMs ?? msg?.ts_ms) >= cutoffMs);
-}
-
-function scheduleFt4Ui(key, job) {
-  if (typeof window.trxScheduleUiFrameJob === "function") {
-    window.trxScheduleUiFrameJob(key, job);
-    return;
-  }
-  job();
-}
-
-function scheduleFt4HistoryRender() { scheduleFt4Ui("ft4-history", () => renderFt4History()); }
-
-function normalizeFt4DisplayFreqHz(freqHz) {
-  const rawHz = Number(freqHz);
-  if (!Number.isFinite(rawHz)) return null;
-  const baseHz = Number.isFinite(window.ft8BaseHz) ? Number(window.ft8BaseHz) : null;
-  if (Number.isFinite(baseHz) && baseHz > 0 && rawHz >= 0 && rawHz < 100000) {
-    return baseHz + rawHz;
-  }
-  return rawHz;
-}
-
-function updateFt4PeriodTimer() {
-  if (!ft4PeriodEl) return;
-  const nowMs = Date.now();
-  const remaining = (FT4_PERIOD_MS - nowMs % FT4_PERIOD_MS) / 1000;
-  ft4PeriodEl.textContent = `Next slot ${remaining.toFixed(1)}s`;
-}
-
-updateFt4PeriodTimer();
-setInterval(updateFt4PeriodTimer, 250);
-
-function renderFt4Row(msg) {
-  const row = document.createElement("div");
-  row.className = "ft8-row";
-  const rawMessage = (msg.message || "").toString();
-  row.dataset.message = rawMessage.toUpperCase();
-  row.dataset.decoder = "ft4";
-  row.dataset.storedFreqHz = Number.isFinite(msg.freq_hz) ? String(msg.freq_hz) : "";
-  const snr = Number.isFinite(msg.snr_db) ? msg.snr_db.toFixed(1) : "--";
-  const dt = Number.isFinite(msg.dt_s) ? msg.dt_s.toFixed(2) : "--";
-  const displayFreqHz = normalizeFt4DisplayFreqHz(msg.freq_hz);
-  const freq = Number.isFinite(displayFreqHz) ? displayFreqHz.toFixed(0) : "--";
-  const renderedMessage = ft8RenderMessage(rawMessage);
-  const tsMs = msg._tsMs ?? msg.ts_ms;
-  const timeStr = tsMs ? new Date(tsMs).toLocaleTimeString([], { hour: "2-digit", minute: "2-digit", second: "2-digit" }) : "--:--:--";
-  row.innerHTML = `<span class="ft8-time">${timeStr}</span><span class="ft8-snr">${snr}</span><span class="ft8-dt">${dt}</span><span class="ft8-freq">${freq}</span><span class="ft8-msg">${renderedMessage}</span>`;
-  return row;
-}
-
-function renderFt4History() {
-  pruneFt4MessageHistory();
-  if (!ft4MessagesEl) return;
-  const filter = ft4FilterText;
-  const fragment = document.createDocumentFragment();
-  let rendered = 0;
-  for (let i = 0; i < ft4MessageHistory.length && rendered < FT4_MAX_DOM_ROWS; i++) {
-    const msg = ft4MessageHistory[i];
-    if (filter && !(msg.message || "").toString().toUpperCase().includes(filter)) continue;
-    fragment.appendChild(renderFt4Row(msg));
-    rendered++;
-  }
-  ft4MessagesEl.replaceChildren(fragment);
-}
-
-function addFt4Message(msg) {
-  msg._tsMs = Number.isFinite(msg?.ts_ms) ? Number(msg.ts_ms) : Date.now();
-  ft4MessageHistory.unshift(msg);
-  pruneFt4MessageHistory();
-  window.setFt8FamilyBarDecoder?.("ft4");
-  window.updateFt8Bar?.();
-  scheduleFt4HistoryRender();
-}
-
-function normalizeServerFt4Message(msg) {
-  const raw = (msg.message || "").toString();
-  const locatorDetails = typeof ft8ExtractLocatorDetails === "function" ? ft8ExtractLocatorDetails(raw) : [];
-  const grids = locatorDetails.length > 0
-    ? locatorDetails.map((d) => d.grid)
-    : (typeof ft8ExtractAllGrids === "function" ? ft8ExtractAllGrids(raw) : []);
-  const station = typeof ft8ExtractLikelyCallsign === "function" ? ft8ExtractLikelyCallsign(raw) : null;
-  const rfHz = normalizeFt4DisplayFreqHz(msg.freq_hz);
-  return {
-    raw, grids, station, rfHz, locatorDetails,
-    history: {
-      receiver: window.getDecodeRigMeta ? window.getDecodeRigMeta() : null,
-      ts_ms: msg.ts_ms, snr_db: msg.snr_db, dt_s: msg.dt_s,
-      freq_hz: Number.isFinite(rfHz) ? rfHz : msg.freq_hz,
-      message: msg.message,
-    },
-  };
-}
-
-window.onServerFt4Batch = function(messages) {
-  if (!Array.isArray(messages) || messages.length === 0) return;
-  if (ft4Status) ft4Status.textContent = "Receiving";
-  const normalized = [];
-  for (const msg of messages) {
-    const next = normalizeServerFt4Message(msg);
-    if (next.grids.length > 0 && window.mapAddLocator) {
-      window.mapAddLocator(next.raw, next.grids, "ft4", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
-    }
-    next.history._tsMs = Number.isFinite(next.history?.ts_ms) ? Number(next.history.ts_ms) : Date.now();
-    normalized.push(next.history);
-  }
-  normalized.reverse();
-  ft4MessageHistory = normalized.concat(ft4MessageHistory);
-  pruneFt4MessageHistory();
-  window.setFt8FamilyBarDecoder?.("ft4");
-  window.updateFt8Bar?.();
-  scheduleFt4HistoryRender();
-};
-
-window.restoreFt4History = function(messages) { window.onServerFt4Batch(messages); };
-window.pruneFt4HistoryView = function() { pruneFt4MessageHistory(); renderFt4History(); };
-
-window.resetFt4HistoryView = function() {
-  if (ft4MessagesEl) ft4MessagesEl.innerHTML = "";
-  ft4MessageHistory = [];
-  window.updateFt8Bar?.();
-  renderFt4History();
-};
-
-function buildFt4BarFrames() {
-  const cutoffMs = Date.now() - 15 * 60 * 1000;
-  const messages = ft4MessageHistory.filter((msg) => Number(msg._tsMs ?? msg.ts_ms) >= cutoffMs).slice(0, 8);
-  const newestTsMs = messages.reduce((latest, msg) => Math.max(latest, Number(msg._tsMs ?? msg.ts_ms) || 0), 0);
-  if (messages.length === 0) {
-    return { count: 0, newestTsMs: 0, html: "" };
-  }
-  let html = "";
-  for (const msg of messages) {
-    const tsMs = msg._tsMs ?? msg.ts_ms;
-    const ts = tsMs ? `<span class="aprs-bar-time">${fmtTime(tsMs)}</span>` : "";
-    const snr = Number.isFinite(msg.snr_db) ? `${msg.snr_db.toFixed(1)} dB` : "-- dB";
-    const dt = Number.isFinite(msg.dt_s) ? `dt ${msg.dt_s.toFixed(2)}` : null;
-    const displayFreqHz = normalizeFt4DisplayFreqHz(msg.freq_hz);
-    const rf = Number.isFinite(displayFreqHz) ? `${displayFreqHz.toFixed(0)} Hz` : null;
-    const detail = [snr, dt, rf].filter(Boolean).join(" · ");
-    const text = ft8RenderMessage((msg.message || "").toString());
-    html += `<div class="aprs-bar-frame"><div class="aprs-bar-frame-main">${ts}<span class="aprs-bar-call">${text}</span>${detail ? ` · ${detail}` : ""}</div></div>`;
-  }
-  return { count: messages.length, newestTsMs, html };
-}
-window.registerFt8FamilyBarRenderer?.("ft4", buildFt4BarFrames);
-
-if (ft4FilterInput) {
-  ft4FilterInput.addEventListener("input", () => {
-    ft4FilterText = ft4FilterInput.value.trim().toUpperCase();
-    renderFt4History();
-  });
-}
-
-const ft4DecodeToggleBtn = document.getElementById("ft4-decode-toggle-btn");
-ft4DecodeToggleBtn?.addEventListener("click", async () => {
-  try {
-    await window.takeSchedulerControlForDecoderDisable?.(ft4DecodeToggleBtn);
-    await postPath("/toggle_ft4_decode");
-  } catch (e) {
-    console.error("FT4 toggle failed", e);
-  }
-});
-
-document.getElementById("settings-clear-ft4-history")?.addEventListener("click", async () => {
-  if (!await window.trxUi.confirm({ title: "Clear FT4 history?", message: "All stored FT4 decodes will be permanently removed.", confirmLabel: "Clear history" })) return;
-  try {
-    await postPath("/clear_ft4_decode");
-    window.resetFt4HistoryView();
-  } catch (e) { console.error("FT4 history clear failed", e); }
-});
-
-window.onServerFt4 = function(msg) {
-  if (ft4Status) ft4Status.textContent = "Receiving";
-  const next = normalizeServerFt4Message(msg);
-  if (next.grids.length > 0 && window.mapAddLocator) {
-    window.mapAddLocator(next.raw, next.grids, "ft4", next.station, { ...msg, freq_hz: next.rfHz, locator_details: next.locatorDetails });
-  }
-  addFt4Message(next.history);
-};
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft4.ts b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft4.ts
new file mode 100644
index 00000000..3a9a1816
--- /dev/null
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ft4.ts
@@ -0,0 +1,7 @@
+// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import { initializeFtxDecoder } from "./ftx-family";
+
+initializeFtxDecoder({ id: "ft4", label: "FT4", periodMs: 7_500 });
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ftx-family.ts b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ftx-family.ts
new file mode 100644
index 00000000..0c27c921
--- /dev/null
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/plugins/ftx-family.ts
@@ -0,0 +1,203 @@
+// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+export type FtxDecoderId = "ft2" | "ft4";
+
+interface FtxMessage {
+  message?: string | undefined;
+  ts_ms?: number | undefined;
+  _tsMs?: number | undefined;
+  snr_db?: number | undefined;
+  dt_s?: number | undefined;
+  freq_hz?: number | undefined;
+  receiver?: unknown;
+  [key: string]: unknown;
+}
+
+interface LocatorDetails { grid: string; [key: string]: unknown }
+interface BarFrames { count: number; newestTsMs: number; html: string }
+interface ConfirmApi {
+  confirm(options: { title: string; message: string; confirmLabel: string }): Promise<boolean>;
+}
+interface FtxBridge {
+  ft8BaseHz?: number;
+  getDecodeHistoryRetentionMs?: () => number;
+  trxScheduleUiFrameJob?: (key: string, job: () => void) => void;
+  renderFt8Message?: (message: string) => string;
+  ft8EscapeHtml?: (message: string) => string;
+  ft8ExtractLocatorDetails?: (message: string) => LocatorDetails[];
+  ft8ExtractAllGrids?: (message: string) => string[];
+  ft8ExtractLikelyCallsign?: (message: string) => string | null;
+  getDecodeRigMeta?: () => unknown;
+  mapAddLocator?: (
+    raw: string,
+    grids: string[],
+    decoder: FtxDecoderId,
+    station: string | null,
+    message: FtxMessage,
+  ) => void;
+  setFt8FamilyBarDecoder?: (decoder: FtxDecoderId) => void;
+  updateFt8Bar?: () => void;
+  registerFt8FamilyBarRenderer?: (decoder: FtxDecoderId, renderer: () => BarFrames) => void;
+  takeSchedulerControlForDecoderDisable?: (button: HTMLElement) => Promise<void>;
+  postPath?: (path: string) => Promise<unknown>;
+  fmtTime?: (timestampMs: number) => string;
+  trxUi: ConfirmApi;
+  [key: string]: unknown;
+}
+
+interface FtxConfig {
+  id: FtxDecoderId;
+  label: "FT2" | "FT4";
+  periodMs: number;
+}
+
+const bridge = window as unknown as FtxBridge;
+
+function finiteNumber(value: unknown): number | null {
+  const number = typeof value === "number" ? value : Number(value);
+  return Number.isFinite(number) ? number : null;
+}
+
+export function initializeFtxDecoder(config: FtxConfig): void {
+  const { id, label, periodMs } = config;
+  const status = document.getElementById(`${id}-status`);
+  const period = document.getElementById(`${id}-period`);
+  const messagesElement = document.getElementById(`${id}-messages`);
+  const filterInput = document.getElementById(`${id}-filter`) as HTMLInputElement | null;
+  let filterText = "";
+  let history: FtxMessage[] = [];
+
+  const renderMessage = (message: string): string => {
+    if (bridge.renderFt8Message) return bridge.renderFt8Message(message);
+    if (bridge.ft8EscapeHtml) return bridge.ft8EscapeHtml(message);
+    return message;
+  };
+  const retentionMs = (): number => bridge.getDecodeHistoryRetentionMs?.() ?? 86_400_000;
+  const prune = (): void => {
+    const cutoff = Date.now() - retentionMs();
+    history = history.filter((message) => (finiteNumber(message._tsMs ?? message.ts_ms) ?? 0) >= cutoff);
+  };
+  const schedule = (job: () => void): void => {
+    if (bridge.trxScheduleUiFrameJob) bridge.trxScheduleUiFrameJob(`${id}-history`, job);
+    else job();
+  };
+  const displayFrequency = (value: unknown): number | null => {
+    const raw = finiteNumber(value);
+    if (raw === null) return null;
+    const base = finiteNumber(bridge.ft8BaseHz);
+    return base !== null && base > 0 && raw >= 0 && raw < 100_000 ? base + raw : raw;
+  };
+  const renderRow = (message: FtxMessage): HTMLDivElement => {
+    const row = document.createElement("div");
+    row.className = "ft8-row";
+    const raw = message.message ?? "";
+    row.dataset.message = raw.toUpperCase();
+    row.dataset.decoder = id;
+    const storedFrequency = finiteNumber(message.freq_hz);
+    row.dataset.storedFreqHz = storedFrequency === null ? "" : String(storedFrequency);
+    const snr = finiteNumber(message.snr_db);
+    const delta = finiteNumber(message.dt_s);
+    const frequency = displayFrequency(message.freq_hz);
+    const timestamp = finiteNumber(message._tsMs ?? message.ts_ms);
+    const time = timestamp === null ? "--:--:--" : new Date(timestamp).toLocaleTimeString([], {
+      hour: "2-digit", minute: "2-digit", second: "2-digit",
+    });
+    row.innerHTML = `<span class="ft8-time">${time}</span><span class="ft8-snr">${snr?.toFixed(1) ?? "--"}</span><span class="ft8-dt">${delta?.toFixed(2) ?? "--"}</span><span class="ft8-freq">${frequency?.toFixed(0) ?? "--"}</span><span class="ft8-msg">${renderMessage(raw)}</span>`;
+    return row;
+  };
+  const render = (): void => {
+    prune();
+    if (!messagesElement) return;
+    const fragment = document.createDocumentFragment();
+    let count = 0;
+    for (const message of history) {
+      if (count >= 200) break;
+      if (filterText && !(message.message ?? "").toUpperCase().includes(filterText)) continue;
+      fragment.appendChild(renderRow(message));
+      count += 1;
+    }
+    messagesElement.replaceChildren(fragment);
+  };
+  const normalize = (message: FtxMessage): FtxMessage => {
+    const raw = message.message ?? "";
+    const locatorDetails = bridge.ft8ExtractLocatorDetails?.(raw) ?? [];
+    const grids = locatorDetails.length > 0
+      ? locatorDetails.map(({ grid }) => grid)
+      : bridge.ft8ExtractAllGrids?.(raw) ?? [];
+    const station = bridge.ft8ExtractLikelyCallsign?.(raw) ?? null;
+    const frequency = displayFrequency(message.freq_hz);
+    if (grids.length > 0) {
+      bridge.mapAddLocator?.(raw, grids, id, station, {
+        ...message, freq_hz: frequency ?? message.freq_hz, locator_details: locatorDetails,
+      });
+    }
+    return {
+      receiver: bridge.getDecodeRigMeta?.() ?? null,
+      ts_ms: message.ts_ms,
+      snr_db: message.snr_db,
+      dt_s: message.dt_s,
+      freq_hz: frequency ?? message.freq_hz,
+      message: message.message,
+      _tsMs: finiteNumber(message.ts_ms) ?? Date.now(),
+    };
+  };
+  const receiveBatch = (messages: FtxMessage[]): void => {
+    if (messages.length === 0) return;
+    if (status) status.textContent = "Receiving";
+    history = messages.map(normalize).reverse().concat(history);
+    prune();
+    bridge.setFt8FamilyBarDecoder?.(id);
+    bridge.updateFt8Bar?.();
+    schedule(render);
+  };
+  const reset = (): void => {
+    history = [];
+    bridge.updateFt8Bar?.();
+    render();
+  };
+  const barFrames = (): BarFrames => {
+    const recent = history
+      .filter((message) => (finiteNumber(message._tsMs ?? message.ts_ms) ?? 0) >= Date.now() - 900_000)
+      .slice(0, 8);
+    let html = "";
+    for (const message of recent) {
+      const timestamp = finiteNumber(message._tsMs ?? message.ts_ms);
+      const time = timestamp === null ? "" : `<span class="aprs-bar-time">${bridge.fmtTime?.(timestamp) ?? ""}</span>`;
+      const snr = finiteNumber(message.snr_db);
+      const delta = finiteNumber(message.dt_s);
+      const frequency = displayFrequency(message.freq_hz);
+      const detail = [snr === null ? "-- dB" : `${snr.toFixed(1)} dB`, delta === null ? null : `dt ${delta.toFixed(2)}`, frequency === null ? null : `${frequency.toFixed(0)} Hz`].filter((part): part is string => part !== null).join(" · ");
+      html += `<div class="aprs-bar-frame"><div class="aprs-bar-frame-main">${time}<span class="aprs-bar-call">${renderMessage(message.message ?? "")}</span>${detail ? ` · ${detail}` : ""}</div></div>`;
+    }
+    return { count: recent.length, newestTsMs: recent.reduce((latest, message) => Math.max(latest, finiteNumber(message._tsMs ?? message.ts_ms) ?? 0), 0), html };
+  };
+
+  const capitalized = `${id[0]?.toUpperCase() ?? ""}${id.slice(1)}`;
+  bridge[`onServer${capitalized}Batch`] = (messages: FtxMessage[]) => { if (Array.isArray(messages)) receiveBatch(messages); };
+  bridge[`restore${capitalized}History`] = receiveBatch;
+  bridge[`prune${capitalized}HistoryView`] = () => { prune(); render(); };
+  bridge[`reset${capitalized}HistoryView`] = reset;
+  bridge[`onServer${capitalized}`] = (message: FtxMessage) => { receiveBatch([message]); };
+  bridge.registerFt8FamilyBarRenderer?.(id, barFrames);
+
+  const updatePeriod = (): void => {
+    if (period) period.textContent = `Next slot ${((periodMs - Date.now() % periodMs) / 1000).toFixed(1)}s`;
+  };
+  updatePeriod();
+  window.setInterval(updatePeriod, 250);
+  filterInput?.addEventListener("input", () => { filterText = filterInput.value.trim().toUpperCase(); render(); });
+  const toggle = document.getElementById(`${id}-decode-toggle-btn`);
+  toggle?.addEventListener("click", () => { void (async () => {
+    try {
+      await bridge.takeSchedulerControlForDecoderDisable?.(toggle);
+      await bridge.postPath?.(`/toggle_${id}_decode`);
+    } catch (error: unknown) { console.error(`${label} toggle failed`, error); }
+  })(); });
+  document.getElementById(`settings-clear-${id}-history`)?.addEventListener("click", () => { void (async () => {
+    if (!await bridge.trxUi.confirm({ title: `Clear ${label} history?`, message: `All stored ${label} decodes will be permanently removed.`, confirmLabel: "Clear history" })) return;
+    try { await bridge.postPath?.(`/clear_${id}_decode`); reset(); }
+    catch (error: unknown) { console.error(`${label} history clear failed`, error); }
+  })(); });
+}
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/ftx-family.test.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/ftx-family.test.mjs
new file mode 100644
index 00000000..58e81dc6
--- /dev/null
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/ftx-family.test.mjs
@@ -0,0 +1,41 @@
+// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import assert from "node:assert/strict";
+import { readFile } from "node:fs/promises";
+import test from "node:test";
+import vm from "node:vm";
+
+test("FT2 entry normalizes audio offsets and registers typed callbacks", async () => {
+  let barRenderer;
+  const mapMessages = [];
+  const window = {
+    ft8BaseHz: 14_074_000,
+    trxUi: { confirm: async () => true },
+    ft8ExtractAllGrids: () => ["JO91"],
+    ft8ExtractLikelyCallsign: () => "SP0ABC",
+    mapAddLocator: (...args) => { mapMessages.push(args); },
+    registerFt8FamilyBarRenderer: (_decoder, renderer) => { barRenderer = renderer; },
+    fmtTime: () => "12:00",
+    setInterval() { return 1; },
+  };
+  const context = vm.createContext({
+    window,
+    document: { getElementById: () => null, createElement: () => ({ dataset: {} }), createDocumentFragment: () => ({ appendChild() {} }) },
+    Date,
+    Number,
+    String,
+    Array,
+    console,
+  });
+  const source = await readFile(new URL("../../assets/web/generated/ft2.js", import.meta.url), "utf8");
+  new vm.Script(source).runInContext(context);
+
+  window.onServerFt2({ message: "CQ SP0ABC JO91", freq_hz: 1_250, ts_ms: Date.now(), snr_db: -8 });
+  assert.equal(mapMessages.length, 1);
+  assert.equal(mapMessages[0][4].freq_hz, 14_075_250);
+  const bar = barRenderer();
+  assert.equal(bar.count, 1);
+  assert.match(bar.html, /CQ SP0ABC JO91/);
+});