Does anyone know a way around the problem that gpredict can only control the FT-817 downlink frequency. I suspect there is a limitation in the hamlib control for this rig. The gpredict manual says 'the TX frequency can not be adjusted via the CAT interface (e.g. Yaesu FT-817)' but SatPC32 on windows manages to handle TX and RX so it must be possible. Dick G4BBH
Hello, To adjust the TX frequency via CATcontrol a program first has to toggle the VFOs (command hex. 81) to get access to the TX VFO. After adjusting the TX frequency it has to toggle the VFOs back, of course.
Also, it is necessary to check the TX status (command hex. F7) before sending frequency commands. The frequencies must not be changed during TX. The adjusment has to be suspended until the radio is in RX again.
73s, Erich, DK1TB
----- Original Message ----- From: "Richard Ferryman" [email protected] To: [email protected] Sent: Tuesday, March 26, 2013 2:00 AM Subject: [amsat-bb] gpredict and ft-817 cat control
Does anyone know a way around the problem that gpredict can only control the FT-817 downlink frequency. I suspect there is a limitation in the hamlib control for this rig. The gpredict manual says 'the TX frequency can not be adjusted via the CAT interface (e.g. Yaesu FT-817)' but SatPC32 on windows manages to handle TX and RX so it must be possible. Dick G4BBH _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
What happens if you do try to change frequencies during transmit? There is a race condition between the status check and frequency programming where the mike PTT button could be pressed. Greg. KO6TH
participants (3)
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Erich Eichmann -
Greg Dolkas -
Richard Ferryman