[Elecraft] Need coax relay to switch ant between K2 & K3

Randy Farmer w8fn at tx.rr.com
Thu Jul 29 21:35:06 EDT 2010


The Top Ten Devices A/B switch will work very well for this 
application. It even has a lockout so you cannot "steal" the antenna 
from the currently selected port. You will need a control signal that 
pulls to ground to activate the A and B selection. A pair of simple 
open collector transistors controlled by the +12V output on their 
respective radios will do the trick. Run a +12V supply and the two 
control lines to the switch. The power supply commons ("grounds") of 
the two radios must be tied together somewhere to make this scheme 
work, however.

I use one of the A/B switches to switch the output of the B side of 
my Array Solutions SixPak between the Sub receiver on my K3 in single 
radio mode and the second radio in two radio mode. It works great, 
and the switch has very good isolation between the two ports.

73...
Randy, W8FN

>I had a Dow-Key coax relay (just what I want) on my Viking II. Both long
>gone.
>
>Anyone have one or something that'll do the trick? Any extra PL-259's
>with sleeve for smaller coax?



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