From eb97d8379d77b17cb8c7d80b8315391ffa575f25 Mon Sep 17 00:00:00 2001
From: Stan Grams <sjg@haxx.space>
Date: Sun, 22 Mar 2026 14:15:25 +0100
Subject: [PATCH] [chore](trx-rs): remove MANUAL.md - moved to docs/ (wiki
 submodule)

Signed-off-by: Stan Grams <sjg@haxx.space>
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-# trx-rs Manual
-
-## SDR Noise Blanker
-
-The noise blanker suppresses impulse noise (clicks, pops, ignition interference)
-on raw IQ samples before any mixing or filtering takes place.  It works by
-tracking a running RMS level of the signal and replacing any sample whose
-magnitude exceeds **threshold x RMS** with the last known clean sample.
-
-### Configuration (server-side)
-
-The noise blanker is configured per rig.  In a multi-rig setup each
-`[[rigs]]` entry has its own `[rigs.sdr.noise_blanker]` section:
-
-```toml
-[[rigs]]
-id = "hf"
-
-[rigs.rig]
-type = "sdr"
-
-[rigs.sdr.noise_blanker]
-enabled = true
-threshold = 10.0     # 1 – 100; lower = more aggressive blanking
-```
-
-For the legacy single-rig (flat) config the path is `[sdr.noise_blanker]`:
-
-```toml
-[sdr.noise_blanker]
-enabled = true
-threshold = 10.0
-```
-
-| Field       | Type  | Default | Range   | Description |
-|-------------|-------|---------|---------|-------------|
-| `enabled`   | bool  | false   | —       | Turn the noise blanker on or off. |
-| `threshold` | float | 10.0    | 1 – 100 | Multiplier applied to the running RMS. A sample whose magnitude exceeds this multiple is replaced. Lower values blank more aggressively; higher values only catch strong impulses. |
-
-The noise blanker is off by default.
-
-### Choosing a threshold
-
-The threshold controls how aggressively the blanker suppresses impulses.
-A value of **N** means: blank any sample whose magnitude exceeds **N times**
-the running average signal level.
-
-| Threshold | Behavior | Use case |
-|-----------|----------|----------|
-| 3 – 5    | Very aggressive — blanks frequently | Dense impulse noise (motors, power lines, LED drivers nearby) |
-| 8 – 12   | Moderate — catches clear spikes without touching normal signals | Typical HF conditions with occasional ignition or switching noise |
-| 15 – 25  | Conservative — only blanks strong impulses well above the noise floor | Light interference, or when you want minimal artifacts on weak signals |
-| 30 – 100 | Very light — rarely triggers | Faint, infrequent clicks; mostly a safety net |
-
-**Start at 10** (the default) and adjust while listening:
-
-- If impulse noise is still audible, lower the threshold.
-- If weak signals sound choppy or distorted, raise it — the blanker may be
-  mistaking signal peaks for noise.
-- On bands with steady atmospheric noise (e.g. 160 m / 80 m), a threshold of
-  **5 – 8** usually works well.
-- On quieter VHF/UHF bands where the noise floor is low, values of **15 – 25**
-  avoid false triggers from strong signals.
-
-### Web UI
-
-When the server reports noise-blanker support, two controls appear in the
-**SDR Settings** row of the web interface:
-
-- **Noise Blanker** checkbox — enables or disables the blanker in real time.
-- **NB Threshold** number input (1–100) with a **Set** button — adjusts the
-  detection threshold.  Press Enter or click Set to apply.
-
-Both controls stay hidden until the server sends filter state containing NB
-fields, so they only appear when connected to an SDR backend.
-
-### HTTP API
-
-```
-POST /set_sdr_noise_blanker?enabled=true&threshold=10
-```
-
-| Parameter   | Type   | Required | Description |
-|-------------|--------|----------|-------------|
-| `enabled`   | bool   | yes      | `true` or `false` |
-| `threshold` | float  | yes      | Value between 1 and 100 |
-
-### How it works
-
-The blanker runs on every IQ block (4096 samples) *before* the mixer stage in
-the DSP pipeline:
-
-1. For each sample, compute magnitude² (`re² + im²`).
-2. Compare against `threshold² × mean_sq` (the exponentially-smoothed running
-   mean of magnitude²).
-3. If the sample exceeds the threshold, replace it with the previous clean
-   sample.
-4. Otherwise, update the running mean with smoothing factor α = 1/128 and store
-   the sample as the last clean value.
-
-Because the blanker operates on raw IQ before frequency translation, it removes
-impulse noise across the entire captured bandwidth regardless of the tuned
-channel offset.