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Digital Transmissions

Digital Transmissions

Updated March 15, 2021


Frequencies are 3.5975, 7.095, 14.095, 18.1025, 21.095, 28.095, 50350 kHz, and 147.555 MHz.

Bulletins are sent at 45.45-baud Baudot, PSK31 in BPSK mode and MFSK16 in a daily, revolving schedule.

The regular callup will be made using the mode that is transmitted first.  The digital bulletin times remain at 6 PM and 9 PM Eastern Time - currently 2200 UTC and 0100 UTC, respectively - daily.

The Tuesday and Friday Keplerian data bulletins will continue to be sent using just Baudot and PSK31.

The digital schedule is as follows:

Monday:           Baudot, PSK31, MFSK16

Tuesday:          PSK31, MFSK16, Baudot

Wednesday:     MFSK16, Baudot, PSK31

      Baudot, PSK31, MFSK16

Friday:              PSK31, Baudot, MFSK16

Given time constraints and bulletin lengths, all three modes may not always be transmitted.

Keplerian elements for many amateur satellites will be sent on the regular digital frequencies on Tuesdays and Fridays at 6:30 PM Eastern Time (currently 2230 UTC) using Baudot and PSK31.