Some more work on the digimode interface ... / 2014-08-17

Some more work on the digimode interface for the FT-857 radio: setting it up on a real circuit board, to be built into a plastic casing. This time I heard a strange ticking sound when recording audio from PI3UTR but again it seems this clicking sound is a local problem normally filtered out from the audio path of the radio. When I picked up PI3UTR on the Wouxun KG-UVD1P radio I heard the same ticking noise. New respect for the audio filtering in the FT-857, but things like this make me question the digimode interface every time I'm testing it.

Radio data interface, The interface in its case

The digimode interface is now finished, but now I need to test it with real radio signals. I don't have HF capabilities yet, and I did find PSK31 frequencies for 2m (144.610 MHz) and 70cm (432.610 MHz) but nobody answered a PSK31 CQ on those bands.

Update 2013-08-18: The whole setup together in a somewhat blurry smartphone picture:

Radio working, PC with fldigi controlling the FT-857 radio sending psk31

And fldigi doesn't mind when I control this remote over the network.