[Elecraft] K2 Dual Recieve Plans - Comments Wanted

[John Huffman]

I would appreciate comments on my plans to use my K2 for dual receive.

I'd like to use my K2 with my Ten-Tec Pegasus in a dual receive setup.  I would 
listen with either the K2, the Pegasus, or both.  I would transmit with the 
Pegasus.

I can use N4PY software to have the Pegasus track to the frequency set by the 
K2.

For antenna switching I would modify the Pegasus to have an AUX receiver output 
at the "spare" jack on the back of the Pegasus.  Instructions are in the N4PY 
documentation.  The instructions state that "This jack is fully protected from 
high transmit power when transmitting."  For K2 input I would build the K160M 
module to add a second receive port to the K2 and would use that port as input 
for the AUX receiver output from the Pegasus.

My concerns are how to protect the K2 from getting the front end blown up by the 
Pegasus and how to mute the K2.

I plan on hooking a dummy load to the regular K2 antenna input.  I would do the 
"Simple K2 RX mod handles extremely strong on-frequency signals" from the web 
site which puts diodes across the IF amp.

For muting the K2 I can use the Pegasus EXT T/R jack which is an open collector 
transistor switch rated at up to 24v and 200ma.  The delay is adjustable.  But, 
I'm stuck as to how to take that switch and mute the K2.

I could connect the switch to a relay across the headphones.

I could use that switch to trigger the key input of the K2 to switch the K2's 
internal TR switch.

Neither seems like the right solution.

Advice greatly appreciated.

73 de NA8M
John