Add SNR column to signal hits table

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

routes/listening_post.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import json
+import math
 import os
 import queue
 import select
@@ -287,6 +288,7 @@ def scanner_loop():
                         _start_audio_stream(current_freq, mod)
 
                     try:
+                        snr_db = round(10 * math.log10(rms / effective_threshold), 1) if rms > 0 and effective_threshold > 0 else 0.0
                         scanner_queue.put_nowait({
                             'type': 'signal_found',
                             'frequency': current_freq,
@@ -294,6 +296,7 @@ def scanner_loop():
                             'audio_streaming': True,
                             'level': int(rms),
                             'threshold': int(effective_threshold),
+                            'snr': snr_db,
                             'range_start': scanner_config['start_freq'],
                             'range_end': scanner_config['end_freq']
                         })
@@ -606,6 +609,7 @@ def scanner_loop_power():
                             'audio_streaming': False,
                             'level': level,
                             'threshold': threshold,
+                            'snr': round(snr, 1),
                             'range_start': scanner_config['start_freq'],
                             'range_end': scanner_config['end_freq']
                         })

static/js/modes/listening-post.js

@@ -985,11 +985,15 @@ function addSignalHit(data) {
     }
 
     const mod = data.modulation || 'fm';
+    const snr = data.snr != null ? data.snr : null;
+    const snrText = snr != null ? `${snr > 0 ? '+' : ''}${snr.toFixed(1)} dB` : '---';
+    const snrColor = snr != null ? (snr >= 10 ? 'var(--accent-green)' : snr >= 3 ? 'var(--accent-cyan)' : 'var(--accent-orange, #f0a030)') : 'var(--text-muted)';
     const row = document.createElement('tr');
     row.style.borderBottom = '1px solid var(--border-color)';
     row.innerHTML = `
         <td style="padding: 4px; color: var(--text-secondary); font-size: 9px;">${timestamp}</td>
         <td style="padding: 4px; color: var(--accent-green); font-weight: bold;">${data.frequency.toFixed(3)}</td>
+        <td style="padding: 4px; color: ${snrColor}; font-weight: bold; font-size: 9px;">${snrText}</td>
         <td style="padding: 4px; color: var(--text-secondary);">${mod.toUpperCase()}</td>
         <td style="padding: 4px; text-align: center;">
             <button class="preset-btn" onclick="tuneToFrequency(${data.frequency}, '${mod}')" style="padding: 2px 6px; font-size: 9px; background: var(--accent-green); border: none; color: #000; cursor: pointer; border-radius: 3px;">Listen</button>

templates/index.html

@@ -1303,13 +1303,14 @@
                                     <tr style="color: var(--text-muted); border-bottom: 1px solid var(--border-color);">
                                         <th style="text-align: left; padding: 4px;">Time</th>
                                         <th style="text-align: left; padding: 4px;">Frequency</th>
+                                        <th style="text-align: left; padding: 4px;">SNR</th>
                                         <th style="text-align: left; padding: 4px;">Mod</th>
                                         <th style="text-align: center; padding: 4px; width: 60px;">Action</th>
                                     </tr>
                                 </thead>
                                 <tbody id="scannerHitsBody">
                                     <tr style="color: var(--text-muted);">
-                                        <td colspan="4" style="padding: 15px; text-align: center; font-size: 10px;">No
+                                        <td colspan="5" style="padding: 15px; text-align: center; font-size: 10px;">No
                                             signals detected</td>
                                     </tr>
                                 </tbody>