hfmodemDocumentation

PACTOR-3 mail through VE1YZ — 2026-09-24

W9SSJ called VE1YZ on 40 m with hfmodem's PACTOR modem, logged in, sent one Winlink message and received two. The gateway accepted outbound message PV5D0KLB6XUN, and the session closed with FF and FQ. The operator reported its arrival in the destination inbox; the audio does not establish delivery. Acknowledged local transmit reached PACTOR-3 SL6; peer data received here reached SL2. The session lasted 11 minutes 45 seconds.

FieldValue
Start2026-09-24 04:10:20 UTC
Channel7095.0 kHz USB dial; 7096.5 kHz centre
Transmit power60 W
Mail1 sent, accepted by the gateway; 2 received complete
Replay110 CRC-valid peer data frames from the station receiver

Three recordings ship with the site example:

RecordingSourceRateLengthSHA-256
ReceiverStation receive audio48 kHz603.0 s914101c090bcaa8a21b529c1541b5ef70d0ad0c2eb12b07f3c9a666f42a2e8ac
MonitorLocal transmit-monitor tap, +36.09 s48 kHz693.4 s2ebac0630d50ed829bd632337b2048e568d76587fcf98905358378a3cc8d5937
WitnessRemote SDR, +3.50 s12 kHz613.9 sa6de8dcc8e990e754a6f983970800dbf0a70fe6bc5bb9027ebc9e91cbc00a163

The monitor is aligned to the receiver clock by 12 receive-window envelopes and the witness by 30 unique CRC-valid packet payloads; each shares 48 distinct CRC-valid payloads with the receiver. The witness hears both stations, so it shows that this station's PACTOR-3 transmissions were on the air; the monitor alone shows only what was sent. The example manifest records offsets, residuals and replay limits.

Limits