Batboard

I am trying interface a Maxtrac 100 to a NOMIC soundcard adapter and hving the following p
problem.

I can get the radio to key up but cannot get any TX audio into the radio.

I have tested everything involved on another radio so I know all of my cables and device is working.

I followed the wiring pinouts I use for TNC cables and they work.
Pins: 6 = PTT, 5 = TxAudio, 4 = Ground

Any ideas as this was to be my clubs Echolink system.

WF8S wrote:I am trying interface a Maxtrac 100 to a NOMIC soundcard adapter and hving the following p
problem.

I can get the radio to key up but cannot get any TX audio into the radio.

I have tested everything involved on another radio so I know all of my cables and device is working.

I followed the wiring pinouts I use for TNC cables and they work.
Pins: 6 = PTT, 5 = TxAudio, 4 = Ground

Any ideas as this was to be my clubs Echolink system.

As with most people trying to jury rig a Motorola radio from some off the shelf black box, have you investigated the circuitry of both devices? My point here is that the Motorola radio has a DC bias on the mic high line. Does the sound card have a cap in series with the audio output to keep from shorting out the bias voltage? If you short it out, you don't get any TX audio.

Jim

WF8S wrote: I followed the wiring pinouts I use for TNC cables and they work.
Pins: 6 = PTT, 5 = TxAudio, 4 = Ground

PTT should be pin 3, for starters. Pin 5 is 'flat audio TX', but I'm not certain it worked in older 100's. Pin 2 is the 'regular' TX audio pin.