I ended up replacing Q5, the keyline output transistor on the KX3 RF board. It had a hole in it and apparently the magic smoke had come out. Keyline is now working. This KX3 was purchased used and I had never used an amp or the keyline.
Steve N9SZ On Sat, Nov 21, 2020 at 8:13 PM Steve Zabarnick <zabarn...@gmail.com> wrote: > I'm pretty sure that I am measuring the ring to ground for ACC2. The amp > is not connected. Is there a menu setting I could have wrong? If not is the > keyline output transistor bad? How do I diagnose the problem in the KX3? > > Steve N9SZ > > Steve, > > Are you sure you're looking at the ACC2 ring contact? Ring is KEY OUT; tip is > GPIO, a \ > logic signal configurable in the ACC2 IO Menu entry. > > Wayne > N6KR > > > On Sat, Nov 21, 2020 at 4:12 PM Steve Zabarnick <zabarn...@gmail.com> > wrote: > >> I'm exploring using my KX3 with the QRP-Labs 50W Amplifier. In measuring >> the keyline output, I get zero volts to ground when in receive and about >> 0.5 volts in transmit. When measuring resistance across the keyline I get >> about 70 ohms in receive and 5K ohms in transmit. >> >> Isn't the keyline supposed to be open in receive and grounded in transmit? >> >> Steve N9SZ >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
