From 993a7d2626c0443df1bcb711f06a3326ef7a8e02 Mon Sep 17 00:00:00 2001
From: Smittix <jamessmith1@outlook.com>
Date: Wed, 4 Feb 2026 12:30:13 +0000
Subject: [PATCH] Stabilize sweep display and lower SNR default

---
 routes/listening_post.py          |  8 ++++----
 static/js/modes/listening-post.js | 12 +++++++-----
 templates/index.html              |  4 ++--
 3 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/routes/listening_post.py b/routes/listening_post.py
index 0575434..40df5ce 100644
--- a/routes/listening_post.py
+++ b/routes/listening_post.py
@@ -64,7 +64,7 @@ scanner_config = {
     'bias_t': False,  # Bias-T power for external LNA
     'sdr_type': 'rtlsdr',  # SDR type: rtlsdr, hackrf, airspy, limesdr, sdrplay
     'scan_method': 'power',  # power (rtl_power) or classic (rtl_fm hop)
-    'snr_threshold': 12,
+    'snr_threshold': 8,
 }
 
 # Activity log
@@ -529,7 +529,7 @@ def scanner_loop_power():
             if total_bins <= 0:
                 time.sleep(0.2)
                 continue
-            global_index = 0
+            segment_offset = 0
 
             for sweep_start, sweep_end, sweep_bin, bin_values in segments:
                 # Noise floor (median)
@@ -550,7 +550,7 @@ def scanner_loop_power():
                     snr = val - noise_floor
                     level = int(max(0, snr) * 100)
                     threshold = int(snr_threshold * 100)
-                    progress = min(1.0, global_index / max(1, total_bins - 1))
+                    progress = min(1.0, (segment_offset + idx) / max(1, total_bins - 1))
                     try:
                         scanner_queue.put_nowait({
                             'type': 'scan_update',
@@ -562,7 +562,7 @@ def scanner_loop_power():
                         })
                     except queue.Full:
                         pass
-                    global_index += emit_stride
+                segment_offset += len(bin_values)
 
                 # Detect peaks (clusters above threshold)
                 peaks = []
diff --git a/static/js/modes/listening-post.js b/static/js/modes/listening-post.js
index bc2cb96..be5e3d9 100644
--- a/static/js/modes/listening-post.js
+++ b/static/js/modes/listening-post.js
@@ -28,7 +28,7 @@ let audioQueue = [];
 let isWebSocketAudio = false;
 let audioFetchController = null;
 let audioUnlockRequested = false;
-let scannerSnrThreshold = 12;
+let scannerSnrThreshold = 8;
 
 // Visualizer state
 let visualizerContext = null;
@@ -570,7 +570,11 @@ function handleScannerEvent(data) {
 }
 
 function handleFrequencyUpdate(data) {
-    const freqStr = data.frequency.toFixed(3);
+    const progressValue = (data.progress !== undefined)
+        ? data.progress
+        : ((data.frequency - scannerStartFreq) / (scannerEndFreq - scannerStartFreq));
+    const displayFreq = scannerStartFreq + (progressValue * (scannerEndFreq - scannerStartFreq));
+    const freqStr = displayFreq.toFixed(3);
 
     const currentFreq = document.getElementById('scannerCurrentFreq');
     if (currentFreq) currentFreq.textContent = freqStr + ' MHz';
@@ -579,9 +583,7 @@ function handleFrequencyUpdate(data) {
     if (mainFreq) mainFreq.textContent = freqStr;
 
     // Update progress bar
-    const progress = (data.progress !== undefined)
-        ? (data.progress * 100)
-        : ((data.frequency - scannerStartFreq) / (scannerEndFreq - scannerStartFreq)) * 100;
+    const progress = Math.max(0, Math.min(100, progressValue * 100));
     const progressBar = document.getElementById('scannerProgressBar');
     if (progressBar) progressBar.style.width = Math.max(0, Math.min(100, progress)) + '%';
 
diff --git a/templates/index.html b/templates/index.html
index 8d99eff..31d9acc 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -1073,10 +1073,10 @@
                                     </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"
+                                        <input type="range" id="snrThresholdSlider" min="6" max="20" step="1" value="8"
                                             style="flex: 1;" />
                                         <span id="snrThresholdValue"
-                                            style="font-size: 8px; color: var(--text-muted); min-width: 26px; text-align: right;">12</span>
+                                            style="font-size: 8px; color: var(--text-muted); min-width: 26px; text-align: right;">8</span>
                                     </div>
                                     <!-- Signal Alert inline -->
                                     <div id="mainSignalAlert"