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AB
10
-120
-40
-- dB
160m
80m
60m
40m
30m
20m
17m
15m
12m
10m
kHz
drag to tune
00.000.000MHz
S0
Instant
S0
Hold
--
SNR
100%
Off
-60-40-20-10-50
100%
Extension
↕ drag to resize
Extension
100%
Audio Visualisation
▼
-60-40-20-10-50
RMS:-∞ dB
Peak:-∞ dB
-- ms
Audio Filters
▼
0msDISABLED
No notch filters added yet
Right click on audio spectrum to add notches
0msDISABLED
Left click on audio spectrum to set bandpass filter. Double click to remove
0msDISABLED⚠ CLIPPING
Auto-learns noise on startup and frequency changes. Continuously adapts to slow variations. Higher strength = more aggressive. Adaptation rate controls how quickly the filter tracks changing noise.
VAD Threshold: lower = more sensitive (triggers on weaker signals). Peak Strength: higher = more aggressive gating. Squelch: outputs silence when no signal detected.
Runs server-side as a DSP insert
0msDISABLED
OPENLevel: -- dB
0msDISABLED⚠ CLIPPING
0msDISABLED⚠ CLIPPING
Creates a wider stereo image from mono audio. Width controls overall effect, Delay adds spatial depth, Separation controls channel independence.
0msDISABLED⚠ CLIPPING
0 dB
0 dB
0 dB
0 dB
0 dB
0 dB
0 dB
0 dB
0 dB
0 dB
0 dB
0 dB
Active Channels
Loading...
Audio Recorder
Stopped
00:00
Note: Recording captures the processed audio output including all active filters and effects.
WebM (Opus codec) — small file, re-encodes audio. WAV — uncompressed PCM capture of decoded audio, larger file.
Set Frequency Offset
What frequency do you expect the tone to be at?
Enter the expected frequency in Hz (e.g., 0 for DC, 1000 for 1 kHz tone).
The system will adjust the dial so this signal appears at 1 kHz.
Clear Filter Settings
Are you sure you want to clear all saved filter settings?
This will remove all saved filter configurations from your browser. This action cannot be undone.
Audio Settings
Select the maximum audio buffer before frames are dropped:
The buffer indicator colors adjust dynamically based on your selection.
Shows playback controls on the lock screen and in the OS media tray.
Disable if you experience issues with audio visualisations. Takes effect immediately.
Baseband Power
N/A
Noise Density
N/A
SNR
N/A
SNR History (Last 10 Seconds)
Country Spots
Callsign
Country
Mode
SNR
Grid
Distance
Bearing
Age
Message
Country Spots
Callsign
Country
SNR
WPM
Distance
Bearing
Age
Comment
Download Client
Download the native client for your operating system:
Enter a bypass password to override connection limits. The password will be saved in your browser for future visits.
✉ Chat message — rotate to portrait
HFDL AIRCRAFT MAP
…
MAPS CURRENTLY UNAVAILABLE
Please try again later
ⓘ
▲
AIRCRAFT AGE
< 2 min
< 5 min
< 15 min
older
GND STATION
strong
medium
weak
no sig
▼
Tap ⓘ anytime for map legend
DIGITAL SPOTS MAP
📡…
MODEBANDAGE
🚫 Map unavailableDigital Spots addon not detected
ⓘ
▲
BAND COLOUR
2200m
630m
160m
80m
60m
40m
30m
20m
17m
15m
12m
11m
10m
SNR / SIZE
Strong (≥0 dB)
Medium (-20 to 0)
Weak (< -20 dB)
▼
📊
Tap ⓘ for legend • 📊 for stats
▲
DIGITAL SPOTS — STATISTICS
RANGE
Closest—
Farthest—
TOP COUNTRIES
SPOTS BY BAND
SPOTS BY MODE
▼
CW SPOTS MAP
…
BANDAGE
🚫 Map unavailableCW Skimmer addon not detected
ⓘ
▲
BAND COLOUR
2200m
630m
160m
80m
60m
40m
30m
20m
17m
15m
12m
11m
10m
SNR / SIZE
Strong (≥0 dB)
Medium (-20 to 0)
Weak (< -20 dB)
▼
Tap ⓘ for legend • 📊 for stats
📊
▲
CW SPOTS — STATISTICS
RANGE
Closest—
Farthest—
TOP COUNTRIES
SPOTS BY BAND
▼
RESTORE CONTROLS
CHOOSE DISPLAY MODE
Select how the controls appear on your device. You can change this any time from the menu.
Please note that after 30 seconds of inactivity the spectrum will slow down and may appear jerky. This is done to save power and data. This can be disabled in the menu.
Continue with default
⚡ POWER SAVING TIP
Please note that after 30 seconds of inactivity the spectrum will slow down and may appear jerky. This is done to save power and data. This can be disabled in the menu.
7100.000kHz
REC0:00:00
REC0:00:00☰
CHAT
Enter a callsign or handle to join
↻ Rotate to portrait to use chat
Station
Spectrum / Waterfall
CONTRAST10
Spectrum Smoothness
⚡ Smooth mode uses more data — device may run warm in extended use
After 30 seconds of no interaction, the spectrum and waterfall will drop to the slowest rate to save power.
🔊
AUDIO ONLY MODE
Spectrum & waterfall paused All tuning controls remain active
Zoom not responding?
On slower connections zoom may need a fresh page load to
connect. Tap Reload to restart — it may
take several attempts before zoom connects.