TKB-720 Pin 13

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candrist
Posts: 2
Joined: Sun Jul 24, 2005 2:44 pm
Location: Utah

TKB-720 Pin 13

Post by candrist » Mon Aug 05, 2013 4:55 pm

I just purchased a TKB-720 base station. I am trying to to get a cos detector from pin 13. Right now I get 4.75v all the time from pin 13. I know that it is suppose to be active high and goto 3.5v when receiving a signal. I don't have a service manual to see how I would do that.

Any help would be appreciated.

Regards,

Chris Andrist, KC7WSU

n5tbu
Posts: 409
Joined: Fri Aug 30, 2002 7:20 am
Location: Opelousas,La.

Re: TKB-720 Pin 13

Post by n5tbu » Wed Aug 28, 2013 11:33 am

On the TKR repeater,that pin is tied to an internal squelch or tone squelch and it goes active low.
I can't remember if the TKB has this internal board.
mod

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