On Sat, Jul 1, 2023 at 05:47 PM, KZ7Q Brian Johanson wrote:
My cable looks very similar, but I will try that. I don't think mine has that pin on the bottom that is isolated from the other ones.
Brian;
The DigiRig 1200bps radio interface cable you're using now is wired like so:
Note that the 'RIG_AFOUT' wire ('T' on the TRRS plug) is connected to pin 6 (DATA_OUT_1200) of the mini-DIN-6 plug.
Here is the wiring diagram for the DigiRig 9600bps cable:
On this cable, the 'RIG_AFOUT' wire is connected to pin 3 (DATA_OUT_9600) of the mini-DIN-6 plug.
Except for this one wiring change, the cables are electrically identical, and they should physically look the same.
When you have your FT-7900R configured for 1200bps data, the received audio is output on pin 6 of the radio's mini-DIN-6 'data' connector. This is normal FM radio (de-emphasis filtered) 3KHz bandwidth receive audio, as delivered to the radio speaker.
When you configure the FT-7900R for 9600bps data, unfiltered 6KHz bandwidth receive audio, direct from the radio's discriminator, is output on pin 3 of the mini-DIN-6 'data' connector, and receive audio on pin 6 is disabled.?
This is common behavior on VHF/UHF transceivers that have a mini-DIN-6 'data' connector.
Mark - AD7EF
Mark Davis