« Reply #2 on: November 03, 2001, 08:41:26 AM »
I work PSK portable and /MM as well as from Ascension Island all on the 706MK2G. Here is what I do:
I took that accessory plug that came with the radio and wired it up to a homebrew interface. The circuit is in the Digipan help file and requires wires, 2 stereo plugs, a serial plug, a few resistors, a transistor, and a diode. Next break out the Icom manual and get the color codes for all of the pigtails. Solder the correct pigtails to the circuit, and plug the accessory plug into the rig, the the two audio connectors and the serial plug into your computer and you are good to go.
A few notes however. Unplug the mic when you use the interface as Icom has the bad habit of keying the mic plug along with the accessory circuit. Stray audio from the mic will cause the signal to be overdriven which is a no-no in PSK.
The accessory port has fixed audio in and out, so the mic gain has no effect on the signal. I leave the power level at "H" and adjust the audio drive from my laptop to keep the signal clean, and adust the power out. Keep the "ALC" setting on the meter to ensure that the signal is clean. If the radio kicks in the ALC, reduce the volume out of the soundcard until it disappears.
One last thing, the 706 is a pretty compact radio, obviously, and PSK is a 100% duty cycle mode, so I would recommend to keep the power out lower than 50 watts. I again control this by soundcard drive rather than radio settings. This ensures I have a good, clean signals.
I can answer any other questions if you catch me today or tommorrow. I am taking that rig to sea with me Monday.