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Motorola GTX & MFJ1279 sound card interface

Posted: Wed Sep 05, 2012 2:36 pm
by WF8S
Hello,

I am trying to setup my MFJ-1279 Sound Card Interface to a Motorola GTX radio for use as the transmit side of a repeater using "pcrepeatercontroller" software.

I have followed the 1279's manual and set it up for the following pinout:

6 PTT
5 Mic Audio
4 Ground

No other pins are connected.

The computer keys the interface with no problems, but the 1279 does not key the radio?

As I understand it the GTX uses the same mic. pinout as the Maxtrac so is there something I am missing???

Jacob Tennant - WF8S

Re: Motorola GTX & MFJ1279 sound card interface

Posted: Thu Sep 06, 2012 12:28 pm
by kcbooboo
Those are the correct pins but perhaps you're counting them from the wrong end.

Looking into the front of the GTX radio, the tab is on the bottom and pin 1 is on the right. This is probably NOT the same way other manufacturers number the pins on a modular connector.

Bob M.