I use this four position AV switch to select the keying line. Since it can switch three connections (L/R audio, video) you can get creative. Although I don't use ALC it could also be switched along with the keying line.
https://smile.amazon.com/gp/product/B00KXVBB3Q/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Ken WA2LBI On Fri, Jul 30, 2021 at 3:37 PM Jim Brown <[email protected]> wrote: > 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 > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
