[feat](trx-rs): rename AMC (AM C-QUAM) to SAM (Stereo AM) with stereo width and carrier sync controls

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-core/src/rig/command.rs

@@ -47,5 +47,7 @@ pub enum RigCommand {
     SetWfmDeemphasis(u32),
     SetWfmStereo(bool),
     SetWfmDenoise(WfmDenoiseLevel),
+    SetSamStereoWidth(f32),
+    SetSamCarrierSync(bool),
     GetSpectrum,
 }

src/trx-core/src/rig/controller/handlers.rs

@@ -529,6 +529,8 @@ pub fn command_from_rig_command(cmd: RigCommand) -> Box<dyn RigCommandHandler> {
         | RigCommand::SetWfmDeemphasis(_)
         | RigCommand::SetWfmStereo(_)
         | RigCommand::SetWfmDenoise(_)
+        | RigCommand::SetSamStereoWidth(_)
+        | RigCommand::SetSamCarrierSync(_)
         | RigCommand::GetSpectrum => Box::new(GetSnapshotCommand),
     }
 }

src/trx-core/src/rig/mod.rs

@@ -268,6 +268,26 @@ pub trait RigSdr: Send {
         )))
     }
 
+    fn set_sam_stereo_width<'a>(
+        &'a mut self,
+        _width: f32,
+    ) -> Pin<Box<dyn Future<Output = DynResult<()>> + Send + 'a>> {
+        Box::pin(std::future::ready(Err(
+            Box::new(response::RigError::not_supported("set_sam_stereo_width"))
+                as Box<dyn std::error::Error + Send + Sync>,
+        )))
+    }
+
+    fn set_sam_carrier_sync<'a>(
+        &'a mut self,
+        _enabled: bool,
+    ) -> Pin<Box<dyn Future<Output = DynResult<()>> + Send + 'a>> {
+        Box::pin(std::future::ready(Err(
+            Box::new(response::RigError::not_supported("set_sam_carrier_sync"))
+                as Box<dyn std::error::Error + Send + Sync>,
+        )))
+    }
+
     /// Return the current filter state if this backend supports filter controls.
     fn filter_state(&self) -> Option<state::RigFilterState> {
         None

src/trx-core/src/rig/state.rs

@@ -87,8 +87,8 @@ pub enum RigMode {
     CW,
     CWR,
     AM,
-    /// AM C-QUAM stereo (Compatible Quadrature Amplitude Modulation).
-    AMC,
+    /// Synchronous AM (Stereo AM) — carrier-locked stereo demodulation.
+    SAM,
     WFM,
     FM,
     AIS,
@@ -338,6 +338,12 @@ pub struct RigFilterState {
     pub wfm_stereo_detected: bool,
     #[serde(default = "default_wfm_denoise_level")]
     pub wfm_denoise: WfmDenoiseLevel,
+    /// SAM stereo width (0.0 = mono, 1.0 = full stereo).
+    #[serde(default = "default_sam_stereo_width")]
+    pub sam_stereo_width: f32,
+    /// SAM carrier synchronization enabled.
+    #[serde(default = "default_sam_carrier_sync")]
+    pub sam_carrier_sync: bool,
 }
 
 #[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
@@ -358,6 +364,14 @@ fn default_wfm_stereo() -> bool {
     true
 }
 
+fn default_sam_stereo_width() -> f32 {
+    1.0
+}
+
+fn default_sam_carrier_sync() -> bool {
+    true
+}
+
 fn default_wfm_denoise_level() -> WfmDenoiseLevel {
     WfmDenoiseLevel::Auto
 }