[Elecraft] K3 & KX3 with KPA500/KAT500

[Jim Brown]

On 7/30/2021 9:43 AM, Phil Hystad via Elecraft wrote:
> Can this be done and if so has this been written up or documented someplace?

The KAT500, KPA500, and KPA1500 have excellent frequency sensing, so 
nothing more than a SPDT coax switch is required. I suspect that the key 
lines from the KX3 and K3 can be paralleled. For many years, I've run 
the Key inputs of a KPA500 (and now KPA1500) wired in parallel.

In my station, a K3 is switched between an 87A and a KPA1500. I'm doing 
it with a pair of Tohtsu SPDT coax relays on input and output. Before 
the KPA1500, the KPA500 gave me 500W on 6M, while the 87A was the HF 
contesting amp. Now the 87A is standby.

73, Jim K9YC