Saturday, November 22, 2014

Disabling internal controller on TKR-820

From Mark, N9WYS:

Remove the internal signaling unit. (I'm looking at the TX/RX Unit in the service manual, Page 83, and the Signaling Unit, Page 76.) Unplug both cables from the signaling unit and add the jumpers to the connector.

On CN6 of the repeater TX/RX Unit, or at the cable connector end for CN1 of the Signaling Unit, apply a jumper to pins 2&3, 8&9, 10&11.
Pin 2  = PTT
Pin 3  = KEY
Pin 8  = AFD
Pin 9  = DET
Pin 10 = AC
Pin 11 = GND

That way, if the external crashes, you can plug the internal back in and still be operational.  If the external controller is wired CORRECTLY to the 15 pin accessory plug, it WILL work properly. 
I've used the solid copper 24g telephone wire to short the connections, secured with black tape.  My personal preference was to insert the jumper wires into CN1 connector at the Signaling Unit end of the cable… to reverse the modification, all one needs to do it remove the jumpers and plug the Signaling Unit back in.

NEVER use the internal controller with an external controller. You are
asking for problems.

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