Add SNR threshold control for power scan

routes/listening_post.py

@@ -467,7 +467,7 @@ def scanner_loop_power():
                 noise_floor = sorted_vals[mid]
 
                 # SNR threshold (dB) based on squelch
-                snr_threshold = 8 + (squelch * 0.3)
+                snr_threshold = float(scanner_config.get('snr_threshold', 12))
 
                 # Emit progress updates (throttled)
                 emit_stride = max(1, len(bin_values) // 60)
@@ -800,6 +800,8 @@ def start_scanner() -> Response:
         scanner_config['bias_t'] = bool(data.get('bias_t', False))
         scanner_config['sdr_type'] = str(data.get('sdr_type', 'rtlsdr')).lower()
         scanner_config['scan_method'] = str(data.get('scan_method', '')).lower().strip()
+        if data.get('snr_threshold') is not None:
+            scanner_config['snr_threshold'] = float(data.get('snr_threshold'))
     except (ValueError, TypeError) as e:
         return jsonify({
             'status': 'error',

static/js/modes/listening-post.js

@@ -28,6 +28,7 @@ let audioQueue = [];
 let isWebSocketAudio = false;
 let audioFetchController = null;
 let audioUnlockRequested = false;
+let scannerSnrThreshold = 12;
 
 // Visualizer state
 let visualizerContext = null;
@@ -154,6 +155,7 @@ function startScanner() {
     const dwellSelect = document.getElementById('radioScanDwell');
     const dwell = dwellSelect ? parseInt(dwellSelect.value) : 10;
     const device = getSelectedDevice();
+    const snrThreshold = scannerSnrThreshold || 12;
 
     // Check if using agent mode
     const isAgentMode = typeof currentAgent !== 'undefined' && currentAgent !== 'local';
@@ -215,7 +217,9 @@ function startScanner() {
             gain: gain,
             dwell_time: dwell,
             device: device,
-            bias_t: typeof getBiasTEnabled === 'function' ? getBiasTEnabled() : false
+            bias_t: typeof getBiasTEnabled === 'function' ? getBiasTEnabled() : false,
+            snr_threshold: snrThreshold,
+            scan_method: 'power'
         })
     })
     .then(r => r.json())
@@ -1721,6 +1725,7 @@ function getStreamUrl(freq, mod) {
 function initListeningPost() {
     checkScannerTools();
     checkAudioTools();
+    initSnrThresholdControl();
 
     // WebSocket audio disabled for now - using HTTP streaming
     // initWebSocketAudio();
@@ -1824,6 +1829,29 @@ function initListeningPost() {
     checkIncomingTuneRequest();
 }
 
+function initSnrThresholdControl() {
+    const slider = document.getElementById('snrThresholdSlider');
+    const valueEl = document.getElementById('snrThresholdValue');
+    if (!slider || !valueEl) return;
+
+    const stored = localStorage.getItem('scannerSnrThreshold');
+    if (stored) {
+        const parsed = parseInt(stored, 10);
+        if (!Number.isNaN(parsed)) {
+            scannerSnrThreshold = parsed;
+        }
+    }
+
+    slider.value = scannerSnrThreshold;
+    valueEl.textContent = String(scannerSnrThreshold);
+
+    slider.addEventListener('input', () => {
+        scannerSnrThreshold = parseInt(slider.value, 10);
+        valueEl.textContent = String(scannerSnrThreshold);
+        localStorage.setItem('scannerSnrThreshold', String(scannerSnrThreshold));
+    });
+}
+
 /**
  * Check for incoming tune request from Spy Stations or other pages
  */

templates/index.html

@@ -1071,6 +1071,13 @@
                                             style="font-size: 8px; color: var(--text-muted); min-width: 40px; text-align: right;">--
                                             dB</span>
                                     </div>
+                                    <div style="display: flex; align-items: center; gap: 8px; margin-top: 8px;">
+                                        <span style="font-size: 7px; color: var(--text-muted); letter-spacing: 1px;">SNR THRESH</span>
+                                        <input type="range" id="snrThresholdSlider" min="6" max="20" step="1" value="12"
+                                            style="flex: 1;" />
+                                        <span id="snrThresholdValue"
+                                            style="font-size: 8px; color: var(--text-muted); min-width: 26px; text-align: right;">12</span>
+                                    </div>
                                     <!-- Signal Alert inline -->
                                     <div id="mainSignalAlert"
                                         style="display: none; background: rgba(0, 255, 100, 0.2); border: 1px solid var(--accent-green); border-radius: 4px; padding: 5px; text-align: center; margin-top: 8px;">