James What happens if you unplug the PTT lead from the KPA500? Does your receive return?
Mike va3mw On Tue, Apr 28, 2020 at 3:02 PM James Bennett via Elecraft < [email protected]> wrote: > I’ve run into an interesting situation that has me puzzled. Probably some > dumb pilot error, but after an hour or so looking through the manuals and > thinking about it - I gotta call in the experts. > > I’ve had a K3 for ten years and the KPA500/KAT500 for maybe four or five > years. They work great. I also have a KX2 and thought “why not hook it to > the KPA500 and give it some punch when I need it?”. Since my antenna > connects through a coax switch between the K3 and the KX2, the output of > the KX2 has been flowing through the KPA500/KAT500 since day one, although > never being amplified. I set the KX2 ATU to bypass and do a “tune” on the > KAT500 - finds a nice 1:1 match. Keying the KX2 with the amp in standby > gives me 10w out on the KX2. > > Now, with a station tuned in that is say, S8 on the KX2, when I put the > amp into operate mode, the received signal strength drops about six > S-units. Going back to standby on the amp restores full receive strength. I > have pressed the proper band switch on the amp. When I have the amp in > operate mode and transmit, I get about 190 watts out, with an SWR of 1:1. > > By the way - the K3 IS connected to the amp as it normally is, but powered > off. > > So, it seems like the amp is not sensing the RF frequency coming out of > the KX2 - but why? > > Jim / W6JHB > > > ______________________________________________________________ > 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]
