From Newsgroup: alt.ham-radio.slowscan
Max's News wrote:
Greetings!
I'm trying to get up and running with a couple of the soundcard-based digital transceive programs. I am running the audio output from my computer to the six-pin data port on the rear of my IC-706 (pin 1, data in). No matter how I configure the audio settings on my computer, I cannot get any signal to transmit. I tried both VOX and manual keying to turn on the transmitter, but no power goes out. When I disconnect the plug from the audio output jack on my computer, I can hear the SSTV warbling very clearly, but it isn't making it out of the transmitter. I've seen it recommended that an audio transformer be inserted between computer and radio as an isolator, but it's also stated that it's only to give clear tones.
Any suggestions? Many thanks in advance!
Jeff, WK3U
maxheadspace@cablespeed.com
Jeff,
Don't use the "DATA" plug, instead use the ACCY2 jack, the 13 pin jack.
Pin 2 - Ground/Mike audio shield
Pin 3 - PTT
Pin 11 - TX Audio Input from Interface/Soundcard Speaker Output through
a 10 to 1 audio pad, 10K in series, 1 K to ground, make the 1 K a pot
and use that as a "rough" setting for audio into the rig, then use
the sound card mixer application for "fine" adjustments.
The pad is not needed if one is built into the interface.
Pin 12 - RX Audio Output to Interface/Soundcard Line Input
You might also need "radio ground" which is the shell of the 13 pin
connector for the shield going into the sound card Line Input and pin 5
of the com port connector (ground). If you plan to use the 706 on 2
meters then use a single pole double throw switch and switch between Pin
3 (HF) and Pin 7 (VHF) for PTT.
If you have problems with RFI getting into the computer, maybe reduce
power and also put some ferrite "beads" these can be purchased at Radio
Shack, they are about half inch thick and one inch long and "clamp" on
to the outside of the cables, may need them at both ends, so buy six to
start with.
rocky
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