Controlling the Yaesu FT-857 radio from gpredict / 2014-07-26

2014-07-26 Controlling the Yaesu FT-857 radio from gpredict 5 years ago
First thing to try with the new Yaesu FT-857 amateur radio: get it working with gpredict for amateur satellites. What gpredict can do is control the radio via rigctld, part of Hamlib to set downlink (receive) and uplink (transmit) frequencies automatically to the doppler-shift correct frequency. I bought a CT-62 USB cable for this which is the cable for the Computer Aided Tuning (CAT) interface on this range of radios with a FTDI based serial interface on the side of the computer. I added a new radio in gpredict with:
  • Radio type: FT817/857/897 (auto)
  • PTT status: Read PTT
  • VFO Up/Down: Not applicable

So I installed libhamlib-utils and tried to get rigctld working. At first it gave errors on communicating:
$ rigctld -m 122 -r /dev/ttyUSB0  -v -v
Opened rig model 122, 'FT-857'
ft857: error reading ack
ft857: error reading ack
And I found out the default baudrate of rigctld is 38400 bps and the FT-857 was set to 4800 bps. I tested first with 4800 bps and later changed the rate on the radio to 38400 bps and tested again. Now running:
$ rigctld -m 122 -r /dev/ttyUSB0 --set-conf=serial_speed=38400  -v -v
Opened rig model 122, 'FT-857'
The radio needs to be in 'split' mode so VFOa and VFOb can be set sepately and receiving is on the VFOa frequency and transmitting on VFOb.

Gpredict radio control set up for the FT-857 The good part, especially for SSB satellite work is that gpredict will follow frequency adjustments on the transciever and will track from the adjusted frequency. With the 'lock' function enabled (L button) this will also make the uplink frequency follow downlink changes. Change the (receiving) frequency on the transciever and the transmitting frequency will be updated accordingly. This should make SSB satellite work with one simplex transciever easier.

Sofar in tests without actual satellite communication things seem to work. Next is a test with SO-50 in FM mode, probably on the high pass I see coming Sunday afternoon. A test with an SSB satellite (first trying to receive) will probably be possible later this week with the Funcube-1 (AO-73). I found a gpredict trsp file for FUNCUBE from G0HWW which has a low and a high swapped and confuses gpredict. The one at Funcube AO-73 transponder file for gpredict has this correct.
[FUNCUBE BPSK Telem]
DOWN_LOW=145935000

[FUNCUBE U/V]
UP_LOW=435130000
UP_HIGH=435150000
DOWN_LOW=145950000
DOWN_HIGH=145970000
INVERT=true

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