QSO inspector
Loading recorded exchange…
W9SSJ ↔ KQ4QWH · 20 m · October 25, 2026, about 21:33 UTC. A complete BBS bulletin received over VARA BW500, with CRC-valid receive frames up to L11. Follow the file request, offer, data and completion reply in this 118-second excerpt. Connection and QSY occurred earlier. Some packet bodies are compressed; the saved file and application journal establish completion. Recording and download provenance.
Recorded session
Transfer excerpt · original application outcomeAudio is optional. These recordings contain modem tones and radio noise, not a spoken conversation. The event list describes identified activity, sender, timing and decode results; unidentified intervals are unknown. Decoded bytes can be incomplete or compressed and are not a complete transcript of the recording. Focus a packet control to pause playback for inspection.
At the playhead
Recording waterfall
0–3000 Hz · fixed −100 to 0 dBFS scale · outlines identify the sender; brightness shows the recorded spectrum · TX rail at top, RX rail at bottom · use Playback position to seek with a keyboard
Waterfall measurements in text
Strongest retained frequency bin in each time slice of the current view. These quantized audio measurements do not identify a transmitter or imply a successful decode; use the packet events for that evidence.
Packet signal
Select any packet to inspect its signal.
Modulation guide
DBPSK: differential binary phase. DQPSK: differential quadrature phase. QAM uses both amplitude and phase. OFDM describes how the carriers are arranged.
| Level | Waveform | Carriers |
|---|
Exchange timeline
Following playbackLocal station is the caller · green = CRC verified, amber = failed or partial decode, blue = checked control, grey = candidate, purple = local TX · outlined TX = host record
Exchange ladder
Packet anatomy
Decoded bytes
Traffic at the playhead
Same packet · different receivers
Frames & observations
Frame inspection
Whole-frame replay result · independent of playhead state