[Elecraft] 2m internal transverter PTT out

[w4sc]

This is disappointing news.  I just purchased a K3S-10 to use mainly as a uWave IF.

I looked at the K144XV and KXV3B schematics.  The fix will need to be implemented on the KXV3B.

The K144XV uController monitors the 7R voltage from the baseboard, that is routed through KXV3B, and when this voltage is 0, the 5R voltage is turned off, and 5T ON, sending +5V out the BNC if it is strapped in.  There is not a way for the K144XV to determine the transition out of the RX to the TX state was NOT intended for it.  So the K144XV is being cycled RX/TX, enabled or not.

I have determined a fix that would require 1 trace cut, 2 diodes, and 2 resistors, and 4 connections on the KXV3B.  It is rather simple in circuit design concept, but may be physically difficult to implement.  Possibly with SMT components and a very small PCB.  I do not know how much room is available, or if the trace cut mentioned can be made.

Ben W4SC

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