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TK-790H intercom problems

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KF7PHU

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Dec 26, 2016
Messages
5
Location
Tucson, Az
Howdy,
Found some amazing info on here. I have a TK-790H Remote head unit in my Baja Bug. I'm trying to program it to use with an intercom. The radio transmits and receives with the mic that plugs into the head unit. I can also hear audio via intercom and transmitted from another radio through the headsets but when I push the PTT and talk through the mic on the headsets you can hear it key up on the other radio but when you talk no audio. I know it's simple what am I missing? Please and Thank you in advance.
 
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toastycookies

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Joined
May 29, 2010
Messages
726
Location
the far east
Howdy,
Found some amazing info on here. I have a TK-790H Remote head unit in my Baja Bug. I'm trying to program it to use with an intercom. The radio transmits and receives with the mic that plugs into the head unit. I can also head audio transmitted through the headsets but hen I push the PTT and talk through the mic on the headsets you can hear it key up on the other radio but when you talk no audio. I know it's simple what am I missing? Please and Thank you in advance.
I got one too! Works exactly the same. Got a couple of CPI terminals to connect it to as well.
 

ramal121

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Dec 5, 2008
Messages
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Sonoma, CA
Do you have the headsets connected to the back of the control head or to the DB-25 connector at the back of the radio?
 

ramal121

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Dec 5, 2008
Messages
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Location
Sonoma, CA
When using the DB-25 connector there is a set of jumpers to swap inside the radio to enable mic audio from external accessories. I'll get you more info.
 

HummerMike

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Jul 22, 2015
Messages
95
Location
Abbeville, S.C.
Hello ......... I have a bunch of these Radios. Great Radios. Built like a tank.
OK, your audio in on the back 25 pin connector should be on pin 13. Take the bottom cover off of the radio. You will see two jumpers marked 640 and 641. There is a zero ohm resistor on 641. Take that jumper loose. Put the jumper resistor or just solder jump 640 together. You should now have audio.

Mike
 
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