Files
repo-smod-atsc/src/web/www/sys_spectrum.html
T
rfeng 92b155499d V131R-260725:修正FSSI/FWD显示并优化8VSB频谱分析
修正FSSI/FWD标定、存储和LCD显示;增强8VSB场同步、MER分析及网页频谱展示;更新版本号与修改记录。
2026-07-28 14:05:40 +08:00

745 lines
35 KiB
HTML
Executable File

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title id="webtitle"></title>
<link href="css/styles.css" rel="stylesheet" media="screen">
<script src="js/auth.js"></script>
<script src="js/jquery.js"></script>
<script src="js/dashboard.js"></script>
<style>
/* inherit the page's colours: styles.css themes this shell light or dark */
.spec-toolbar { display:flex; flex-wrap:wrap; gap:18px; align-items:center; margin-bottom:10px; }
.spec-toolbar label { font-size:13px; color:inherit; }
.spec-readouts { display:flex; flex-wrap:wrap; gap:10px; margin-top:12px; }
.spec-readout { min-width:130px; padding:8px 12px; border:1px solid rgba(148,163,184,0.35); border-radius:6px; }
.spec-readout .k { display:block; font-size:11px; letter-spacing:.04em; text-transform:uppercase; opacity:.7; }
.spec-readout .v { display:block; font-size:18px; font-weight:600; }
#spec_canvas { width:100%; height:420px; display:block; background:#0b1220; border-radius:6px; }
#eye_canvas { width:100%; height:380px; display:block; background:#0b1220; border-radius:6px; }
#eye_state { font-size:13px; opacity:.7; margin-left:auto; }
#spec_state { font-size:13px; opacity:.7; margin-left:auto; }
</style>
<script>
var lastTime = new Date().getTime();
var currentTime = new Date().getTime();
var timeOut = 20 * 60 * 1000; // 20 minutes
$(function(){
$(document).on('mousemove keydown click scroll touchstart', function(){
lastTime = new Date().getTime();
});
});
function testTime(){
currentTime = new Date().getTime();
if(currentTime - lastTime > timeOut){
window.location.href="login.cgi?logout=1";
}
}
window.setInterval(testTime, 1000);
setInterval(refreshDashboard, 3000);
function get_remote_local_ctrl()
{
$.get("atsc_status_cfg.cgi?sys_cfg=&", function(data, status){
if (typeof data === 'object' && data !== null) return;
var table = String(data).split("|");
document.title = table[0].split("#")[11];
});
}
function refresh_show(){
get_remote_local_ctrl();
refreshDashboard();
specInit();
}
/* ================= ORx IQ spectrum =================
* iq_spectrum.cgi hands back the newest window analysed by the app's iq_rx
* thread: a 1024-point Welch over one 26.2 ms window of the 10 MSPS complex
* ORx stream. psd[] is in dB relative to the mean in-band flat density
* (|f| < 2.5 MHz) -- the only shoulder yardstick that does not move when the
* FFT length changes. See Notes/Result06-5.md section 7.
*/
var SPEC_TIMER = null;
var specPeak = null; // peak-hold trace
var specLast = null;
var specFails = 0;
var Y_TOP = 30, Y_BOT = -80; // dB rel in-band flat density
var SH_LO = 3.5, SH_HI = 4.8; // shoulder band the app takes the median over
function specInit(){
window.addEventListener('resize', function(){ if (specLast) drawSpectrum(specLast); else drawGrid(); });
drawGrid();
specRestart();
eyeRestart();
}
/* PR12: the Refresh/Pause/Peak-hold toolbar and the status lines were
* removed on request, so these helpers tolerate the elements being absent
* (fixed 1 s refresh, never paused, no peak-hold). */
function elChecked(id){ var e = document.getElementById(id); return !!(e && e.checked); }
function specRateMs(){ var e = document.getElementById('spec_rate'); return e ? Number(e.value) : 1000; }
function specRestart(){
if (SPEC_TIMER) clearInterval(SPEC_TIMER);
if (elChecked('spec_pause')) { setState('paused'); return; }
specFetch();
SPEC_TIMER = setInterval(specFetch, specRateMs());
}
function setState(s){ var e = document.getElementById('spec_state'); if (e) e.innerText = s; }
function setEyeState(s){ var e = document.getElementById('eye_state'); if (e) e.innerText = s; }
function specFetch(){
$.ajax({url: 'iq_spectrum.cgi?t=' + Date.now(), dataType: 'json', cache: false})
.done(function(d){
if (!d || d.error){
if (d && d.redirect) { window.location.href = d.redirect; return; }
setState(d && d.error === 'nodata' ? 'no window captured yet' : 'error');
return;
}
specFails = 0;
specLast = d;
updateReadouts(d);
drawSpectrum(d);
setState('window ' + d.wid + ' | updated ' + new Date().toLocaleTimeString());
})
.fail(function(){ specFails++; setState('fetch failed (' + specFails + ')'); });
}
function updateReadouts(d){
/* PR12: the readout cards under the spectrum were removed; d.shoulder
* and d.pilot are still drawn on the plot itself in drawSpectrum(). */
}
/* ================= 8VSB eye =================
* iq_eye.cgi returns the newest window demodulated by the app's iq_vsb thread:
* matched filter -> j^k derotation -> 130 x 192 persistence map (base64, log-scaled).
* The demod is expensive and nice'd, so a new eye lands roughly every 10 s; the page
* polls at the same rate as the spectrum and redraws only when the window id changes.
*/
var EYE_TIMER = null, eyeWid = -1, eyeFails = 0;
var eyeLastData = null; // newest iq_eye.json, for the in-band noise line
function eyeRestart(){
if (EYE_TIMER) clearInterval(EYE_TIMER);
if (elChecked('spec_pause')) return;
eyeFetch();
EYE_TIMER = setInterval(eyeFetch, specRateMs());
}
function eyeFetch(){
$.ajax({url: 'iq_eye.cgi?t=' + Date.now(), dataType: 'json', cache: false})
.done(function(d){
if (!d || d.error){
if (d && d.redirect) { window.location.href = d.redirect; return; }
setEyeState((d && d.error === 'nodata') ? 'no window demodulated yet' : 'error');
return;
}
if (!d.sync){ setEyeState('no symbol lock'); return; }
eyeFails = 0;
eyeLastData = d;
eyeReadouts(d);
if (d.wid !== eyeWid){ eyeWid = d.wid; drawEye(d); }
setEyeState('window ' + d.wid + ' | ' + d.nsym + ' symbols');
})
.fail(function(){ eyeFails++; setEyeState('fetch failed (' + eyeFails + ')'); });
}
function eyeReadouts(d){
/* PR12: only SNR/MER and SNR raw remain on request. */
document.getElementById('rd_snr').innerText = d.snr_db.toFixed(2);
document.getElementById('rd_snrraw').innerText = (d.snr_raw_db === undefined) ? '--' : d.snr_raw_db.toFixed(2);
var sn = document.getElementById('rd_snr');
sn.style.color = (d.snr_db >= 27) ? '#22c55e' : (d.snr_db >= 20 ? '#f59e0b' : '#ef4444');
}
function drawEye(d){
var c = document.getElementById('eye_canvas');
var dpr = window.devicePixelRatio || 1;
var W = c.clientWidth, H = c.clientHeight;
if (c.width !== Math.round(W*dpr) || c.height !== Math.round(H*dpr)){
c.width = Math.round(W*dpr); c.height = Math.round(H*dpr);
}
var g = c.getContext('2d');
g.setTransform(dpr,0,0,dpr,0,0);
g.clearRect(0,0,W,H);
g.fillStyle = '#0b1220'; g.fillRect(0,0,W,H);
var cols = d.eye.cols, rows = d.eye.rows, amp = d.eye.amp;
var bin = atob(d.eye.data), x, y;
/* Build the histogram off-screen at its native size and let the browser scale it:
* one putImageData beats stroking a thousand paths. */
var off = document.createElement('canvas');
off.width = cols; off.height = rows;
var og = off.getContext('2d');
var img = og.createImageData(cols, rows);
for (x = 0; x < cols; x++){
for (y = 0; y < rows; y++){
var v = bin.charCodeAt(x * rows + y) / 255; /* column-major, row 0 = -amp */
var p = ((rows - 1 - y) * cols + x) * 4; /* canvas y grows downward */
img.data[p] = Math.min(255, 40 + 255 * Math.pow(v, 0.75));
img.data[p + 1] = Math.min(255, 20 + 200 * Math.pow(v, 1.6));
img.data[p + 2] = Math.min(255, 60 + 120 * Math.pow(v, 2.6));
img.data[p + 3] = v > 0 ? 255 : 0;
}
}
og.putImageData(img, 0, 0);
var L = 46, R = 12, T = 10, B = 28;
g.imageSmoothingEnabled = true;
g.drawImage(off, L, T, W - L - R, H - T - B);
function yOfLvl(v){ return T + (amp - v) / (2 * amp) * (H - T - B); }
g.strokeStyle = 'rgba(57,208,255,0.45)'; g.lineWidth = 0.7;
[-7,-5,-3,-1,1,3,5,7].forEach(function(v){
var yy = yOfLvl(v);
g.beginPath(); g.moveTo(L,yy); g.lineTo(W-R,yy); g.stroke();
});
var xc = L + (W - L - R) / 2; /* decision instant = centre column */
g.strokeStyle = '#a3e635'; g.setLineDash([4,3]);
g.beginPath(); g.moveTo(xc,T); g.lineTo(xc,H-B); g.stroke();
g.setLineDash([]);
g.fillStyle = '#94a3b8'; g.font = '11px sans-serif';
g.textAlign = 'right'; g.textBaseline = 'middle';
[-7,-5,-3,-1,1,3,5,7].forEach(function(v){ g.fillText(v.toFixed(0), L-6, yOfLvl(v)); });
g.textAlign = 'center'; g.textBaseline = 'top';
[-1,-0.5,0,0.5,1].forEach(function(u){
g.fillText(u.toFixed(1), L + (u+1)/2*(W-L-R), H-B+5);
});
g.fillStyle = '#64748b'; g.textBaseline = 'bottom';
g.fillText('symbol periods (UI) - decision instant at 0', (L+W-R)/2, H-2);
g.save(); g.translate(12,(T+H-B)/2); g.rotate(-Math.PI/2);
g.textBaseline = 'top'; g.fillText('normalised I level', 0, 0); g.restore();
}
/* ---- canvas ---- */
function specGeom(){
var c = document.getElementById('spec_canvas');
var dpr = window.devicePixelRatio || 1;
var w = c.clientWidth, h = c.clientHeight;
if (c.width !== Math.round(w*dpr) || c.height !== Math.round(h*dpr)){
c.width = Math.round(w*dpr); c.height = Math.round(h*dpr);
}
var g = c.getContext('2d');
g.setTransform(dpr,0,0,dpr,0,0);
return {g:g, w:w, h:h, l:56, r:14, t:14, b:30};
}
function xOf(m, f, fmin, fmax){ return m.l + (f - fmin)/(fmax - fmin) * (m.w - m.l - m.r); }
function yOf(m, db){ return m.t + (Y_TOP - db)/(Y_TOP - Y_BOT) * (m.h - m.t - m.b); }
function drawGrid(fmin, fmax){
if (fmin === undefined){ fmin = -5; fmax = 5; }
var m = specGeom(), g = m.g, f, db;
g.clearRect(0,0,m.w,m.h);
g.fillStyle = '#0b1220'; g.fillRect(0,0,m.w,m.h);
g.fillStyle = 'rgba(56,189,248,0.10)'; // the band the shoulder is measured in
[[SH_LO,SH_HI],[-SH_HI,-SH_LO]].forEach(function(b){
var x0 = xOf(m,Math.max(b[0],fmin),fmin,fmax), x1 = xOf(m,Math.min(b[1],fmax),fmin,fmax);
g.fillRect(x0, m.t, x1-x0, m.h-m.t-m.b);
});
g.lineWidth = 1;
g.font = '11px sans-serif';
g.textAlign = 'center'; g.textBaseline = 'top';
for (f = Math.ceil(fmin); f <= fmax; f++){
var x = Math.round(xOf(m,f,fmin,fmax)) + 0.5;
g.strokeStyle = '#1e293b';
g.beginPath(); g.moveTo(x,m.t); g.lineTo(x,m.h-m.b); g.stroke();
g.fillStyle = '#94a3b8'; g.fillText(f.toFixed(0), x, m.h-m.b+5);
}
g.textAlign = 'right'; g.textBaseline = 'middle';
for (db = Y_TOP; db >= Y_BOT; db -= 10){
var y = Math.round(yOf(m,db)) + 0.5;
g.strokeStyle = (db === 0) ? '#334155' : '#1e293b';
g.beginPath(); g.moveTo(m.l,y); g.lineTo(m.w-m.r,y); g.stroke();
g.fillStyle = '#94a3b8'; g.fillText(db.toFixed(0), m.l-6, y);
}
g.fillStyle = '#64748b'; g.textAlign = 'center'; g.textBaseline = 'bottom';
g.fillText('MHz from carrier', (m.l+m.w-m.r)/2, m.h-2);
g.save(); g.translate(12,(m.t+m.h-m.b)/2); g.rotate(-Math.PI/2);
g.textBaseline = 'top'; g.fillText('dB rel. in-band flat density', 0, 0); g.restore();
return m;
}
function trace(m, psd, f0, df, fmin, fmax, color, width){
var g = m.g, i, started = false;
g.strokeStyle = color; g.lineWidth = width; g.beginPath();
for (i = 0; i < psd.length; i++){
var f = f0 + i*df;
if (f < fmin || f > fmax) continue;
var x = xOf(m,f,fmin,fmax), y = yOf(m, Math.max(Math.min(psd[i],Y_TOP),Y_BOT));
if (!started){ g.moveTo(x,y); started = true; } else g.lineTo(x,y);
}
g.stroke();
}
function drawSpectrum(d){
var fmin = d.f0, fmax = d.f0 + (d.n-1)*d.df;
var m = drawGrid(fmin, fmax), i;
if (elChecked('spec_hold')){
if (!specPeak || specPeak.length !== d.psd.length) specPeak = d.psd.slice();
else for (i = 0; i < d.psd.length; i++) if (d.psd[i] > specPeak[i]) specPeak[i] = d.psd[i];
trace(m, specPeak, d.f0, d.df, fmin, fmax, '#f59e0b', 1);
} else specPeak = null;
trace(m, d.psd, d.f0, d.df, fmin, fmax, '#38bdf8', 1.2);
var y = yOf(m, d.shoulder); // measured shoulder level
m.g.strokeStyle = '#f87171'; m.g.setLineDash([5,4]); m.g.lineWidth = 1;
m.g.beginPath(); m.g.moveTo(m.l,y); m.g.lineTo(m.w-m.r,y); m.g.stroke();
m.g.setLineDash([]);
m.g.fillStyle = '#f87171'; m.g.textAlign = 'left'; m.g.textBaseline = 'bottom';
m.g.fillText('shoulder ' + d.shoulder.toFixed(1) + ' dB', m.l+6, y-3);
/* PR12: pilot vertical marker removed on request (it covered the pilot
* peak). The pilot frequency is still available in d.pilot. */
/* PR12: error signal spectrum (yellow) = reshaped decisions subtracted
* from the actual IQ, in the channel frame so it lines up with the blue
* trace. Full-band residual (shows in-band distortion AND out-of-band
* shoulder). Drawn only where it stays below the blue PSD -- any point
* above the signal breaks the segment (clip, not clamp). */
/* DISABLED on request (2026-07-25): drop the leading `false &&` to restore */
if (false && eyeLastData && eyeLastData.err && eyeLastData.err.db){
var er = eyeLastData.err, g2 = m.g, started = false, ei;
g2.strokeStyle = '#eab308'; g2.lineWidth = 1.4; g2.beginPath();
for (ei = 0; ei < er.db.length; ei++){
var ef = er.f0 + ei*er.df;
if (ef < fmin || ef > fmax){ started = false; continue; }
/* blue signal level at this frequency (nearest published bin) */
var bi = Math.round((ef - d.f0)/d.df);
var sig = (bi >= 0 && bi < d.psd.length) ? d.psd[bi] : 99;
if (er.db[ei] > sig){ started = false; continue; } /* above signal: hide */
var ex = xOf(m, ef, fmin, fmax),
ey = yOf(m, Math.max(Math.min(er.db[ei], Y_TOP), Y_BOT));
if (!started){ g2.moveTo(ex, ey); started = true; } else g2.lineTo(ex, ey);
}
g2.stroke();
/* PR12: yellow error trace has no text label on request */
}
}
// Opens the modal - gets current username from server
function openAccountModal() {
// Fetch current username from server
$.get("login.cgi?action=get_user", function(data) {
var trimmedData = (data || "").trim();
if (trimmedData && trimmedData !== "UNAUTHORIZED") {
document.getElementById('current_user').value = trimmedData;
}
document.getElementById('accountModal').style.display = 'block';
setTimeout(function() { document.getElementById('current_pwd').focus(); }, 100);
}).fail(function() {
document.getElementById('accountModal').style.display = 'block';
setTimeout(function() { document.getElementById('current_pwd').focus(); }, 100);
});
}
// Closes the modal and clears the sensitive inputs
function closeAccountModal() {
document.getElementById('accountModal').style.display = 'none';
document.getElementById('current_pwd').value = '';
document.getElementById('new_pwd').value = '';
document.getElementById('confirm_pwd').value = '';
}
// Validates that a string contains only printable characters (excluding space)
function isValidPrintableString(str) {
// Regular expression to check for printable characters (ASCII 33-126), excluding space
// Space is ASCII 32, and we want to exclude it
var printableCharRegex = /^[!-~]+$/; // ! is ASCII 33, ~ is ASCII 126
return printableCharRegex.test(str);
}
// Validates the passwords match before submitting to the CGI script - All required fields must be filled
function validateAccountForm() {
var currentUser = document.getElementById('current_user').value;
var currentPwd = document.getElementById('current_pwd').value;
var newUsername = document.getElementById('new_user').value;
var newPwd = document.getElementById('new_pwd').value;
var confirmPwd = document.getElementById('confirm_pwd').value;
// Current password is required (cannot be empty)
if (!currentPwd || currentPwd.trim() === "") {
alert("Current password is required");
return false;
}
// Validate current password contains only printable characters
if (!isValidPrintableString(currentPwd)) {
alert("Current password contains invalid characters. Only printable characters (excluding space) are allowed.");
return false;
}
// New password is required (cannot be empty)
if (!newPwd || newPwd.trim() === "") {
alert("New password is required");
return false;
}
// Validate new password contains only printable characters
if (!isValidPrintableString(newPwd)) {
alert("New password contains invalid characters. Only printable characters (excluding space) are allowed.");
return false;
}
// Validate new password length (max 16 chars)
if (newPwd.length > 16) {
alert("New password must be no more than 16 characters");
return false;
}
// Validate new password length
if (newPwd.length < 6) {
alert("New password must be at least 6 characters");
return false;
}
// Confirm password must match new password
if (newPwd !== confirmPwd) {
alert("New passwords do not match");
return false;
}
// Validate confirm password contains only printable characters
if (!isValidPrintableString(confirmPwd)) {
alert("Confirm password contains invalid characters. Only printable characters (excluding space) are allowed.");
return false;
}
// Validate confirm password length (max 16 chars)
if (confirmPwd.length > 16) {
alert("Confirm password must be no more than 16 characters");
return false;
}
// Validate new username if provided
if (newUsername && newUsername.trim() !== "") {
// Validate new username contains only printable characters
if (!isValidPrintableString(newUsername)) {
alert("New username contains invalid characters. Only printable characters (excluding space) are allowed.");
return false;
}
// Validate new username length (max 16 chars)
if (newUsername.length > 16) {
alert("New username must be no more than 16 characters");
return false;
}
}
return true; // Allows the form to submit
}
// Form submission handler using fetch API
document.addEventListener('DOMContentLoaded', function() {
var accountForm = document.getElementById('accountForm');
if (accountForm) {
accountForm.addEventListener('submit', function(e) {
e.preventDefault();
if (!validateAccountForm()) return;
var formData = new URLSearchParams({
Username: document.getElementById('current_user').value,
OldPassword: document.getElementById('current_pwd').value,
NewUsername: document.getElementById('new_user').value,
NewPassword: document.getElementById('new_pwd').value,
ConfirmPassword: document.getElementById('confirm_pwd').value
});
fetch('login.cgi?action=change_account', {
method: 'POST',
body: formData
})
.then(r => r.json())
.then(data => {
if (data.success) {
alert("Update successful! Please login again.");
closeAccountModal();
// Redirect to login page after 1.5 seconds
setTimeout(function() {
window.location.href = 'login.cgi?logout=1';
}, 1500);
} else {
alert(data.error || "Update failed");
}
})
.catch(function(err) {
alert("Network error: " + err);
});
});
}
});
// Optional: Closes the modal if the user clicks the dark background outside the box
window.onclick = function(event) {
var modal = document.getElementById('accountModal');
if (event.target == modal) {
closeAccountModal();
}
}
</script>
</head>
<body onload="refresh_show()">
<div class="app-layout">
<aside class="app-sidebar">
<ul class="items">
<li><a href="status_info.html" title="Status">Status</a></li>
<li><a href="sys_set.html" title="Settings">Settings</a></li>
<li><a href="sys_rf.html" title="RF Control">RF Control</a></li>
<li><a href="sys_psip.html" title="TSID&PSIP">TSID&PSIP</a></li>
<li><a href="sys_ts.html" title="TSoIP">TSoIP</a></li>
<li class="active"><a href="sys_spectrum.html" title="Spectrum">Spectrum</a></li>
<li><a href="log_output.html" title="Log">Log</a></li>
</ul>
<div class="sidebar-footer">
<h4>Anywave Broadcast Inc.</h4>
<p>Copyright 2026<br><br><span class="redbox-label">Technical Support</span><br>+1 847 415 2258<br><a href="mailto:support@anywaveus.com">support@anywaveus.com</a></p>
</div>
</aside>
<div class="sidebar-overlay" onclick="toggleSidebar()"></div>
<header class="app-header">
<button class="menu-toggle" onclick="toggleSidebar()" aria-label="Toggle menu">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
<line x1="3" y1="12" x2="21" y2="12"></line>
<line x1="3" y1="6" x2="21" y2="6"></line>
<line x1="3" y1="18" x2="21" y2="18"></line>
</svg>
</button>
<h1><a href="https://anywavecom.net/" class="logo-bg" title="Anywave Broadcast Inc."></a></h1>
<h2 id="webtitle_header"><span></span></h2>
<h3>
<div class="dropdown">
<button class="dropbtn-modern">Admin &#9662;</button>
<div class="dropdown-content">
<a href="#" onclick="openAccountModal(); return false;">
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<div class="summary-card">
<div class="summary-label-row">
<span class="status-dot status-neutral" id="dot_freq" aria-hidden="true"></span>
<span class="summary-label">Frequency</span>
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<span class="summary-value value-neutral" id="sum_freq">--</span>
<span class="summary-unit">MHz</span>
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<span class="summary-label">SNR</span>
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<span class="summary-value value-ok" id="sum_snr">--</span>
<span class="summary-unit">dB</span>
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<span class="summary-label">UIMD</span>
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<span class="summary-value value-ok" id="sum_uimd">--</span>
<span class="summary-unit">dBc</span>
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<span class="summary-label">LIMD</span>
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<span class="summary-value value-ok" id="sum_limd">--</span>
<span class="summary-unit">dBc</span>
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<span class="summary-label">RF Switch</span>
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<span class="summary-label">Output Power</span>
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<span class="summary-unit">dBm</span>
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<span class="summary-label">Bitrate</span>
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<span class="summary-unit">Mbps</span>
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<span class="summary-label">Temperature</span>
</div>
<div class="summary-value-wrapper">
<span class="summary-value value-ok" id="sum_temp">--</span>
<span class="summary-unit">&#176;F</span>
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<div class="summary-card">
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<span class="summary-label">AGC</span>
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<div class="summary-value-wrapper">
<span class="summary-value value-muted" id="sum_agc">--</span>
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<span class="summary-label">Control</span>
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<span class="summary-value value-neutral" id="sum_control">--</span>
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<main class="app-main">
<h2>ORx Receive Spectrum</h2>
<div class="box">
<!-- PR12: Refresh/Pause/Peak-hold toolbar + status line removed on
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the on-plot shoulder line and yellow error trace remain. -->
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<h2>8VSB Eye Diagram</h2>
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<!-- PR12: eye caption + status line removed on request. -->
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<div class="spec-readouts">
<div class="spec-readout" title="MER, I-path definition: 10log10(sum d^2 / sum (r-d)^2)"><span class="k">SNR / MER</span><span class="v"><span id="rd_snr">--</span> dB</span></div>
<div class="spec-readout" title="MER before the ORx AGC gain steps are tracked out. The gap to SNR/MER is what the observation receiver costs you, not the transmitter."><span class="k">SNR raw</span><span class="v"><span id="rd_snrraw">--</span> dB</span></div>
<!-- PR13: FSSI from the ORx FAGC gain index (255->0%, 195->100%).
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<div class="spec-readout" title="ORx front-end signal strength from the FAGC gain index (gain index 255 -> 0%, 195 -> 100%). A path; A / B when the FSSI refresh switch is on."><span class="k">FSSI</span><span class="v"><span id="rd_fssi">--</span> %</span></div>
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