[Elecraft] K3: KXV3 Rx termination

[Edward R. Cole]

While setting up a transverter for PTT over the coax line with a 
bias-T ckt, I encountered a surprise when I connected the transverter 
to the Rx connection of the KXV3.  The line went low every time I 
connected it to the K3.  I measured 75-ohms resistance across the Rx 
BNC on the KXV3!  I would have expected it to be capacitively coupled 
and show infinite resistance.

It is not a problem as a custom interface is being built to key the 
transverter PTT thru a bias-T interface.  The interface incorporates 
dc blocking capacitors to the K3 on both Tx and Rx coax lines.

The customer wants a single coax line between the K3 and the 
transverter, thus PTT over the shared coax line (I suspect the 
transverter is to be placed remotely from the radio and run on a 
separate dc power source).


73, Ed - KL7UW, WD2XSH/45
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