This sounds like a 15-pin ACC cable problem. Iain's suggestion to isolate a defective cable sounds right to me.
RS-232 speeds aren't relevant here. This is the 15-pin ACC connector. Your K3, KAT500 and KPA500 do not communicate with one another via RS-232. If you can connect your PC to the KAT500 and start the KAT500 Utility, it can tell you if it's seeing the K3's band lines; perform band changes on the K3 and see if the KAT500 Utility operate page shows the right band. Or connect the K3 to the KPA500 directly and see if the K3 follows the KPA500 band changes. 73 de Dick, K6KR -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of iain macdonnell - N6ML Sent: Thursday, May 01, 2014 22:00 PM To: Ben Collins-Sussman Cc: Elecraft Reflector Subject: Re: [Elecraft] KPA500 not responding to K3 On Thu, May 1, 2014 at 9:11 PM, Ben Collins-Sussman <suss...@red-bean.com> wrote: > Hello friends, > > I've been using my tiny KX3 with a KPA500 and KAT500 for many months now. > The KX3 only puts out 12 watts, but the KPA500 translates it > successfully into about 200W. The KPA500 and KAT500 have been > connected via the official DB15 cable sold by Elecraft, and the KX3 > triggers the amp via RCA cable into the amp's PA-key connector. > > Fast-forward to today: I just received a K3, and I'm really excited > to see the K3, KPA500, and KAT500 all just "work together" magically. > Except they're not. > > I've connected everything exactly as shown in the KAT500 manual: > > - K3's ACC port is connected to the tuner's XCVR port, via the official > KPAK3AUX cable. > - The tuner's AMP port is connected to the amp's AUX port, via the > official E850463 cable. > > I'm definitely able to use the K3 and tuner together when the amp is off. > But when I turn on the amp, there appears to be no communication > between amp and K3. > > - The amp doesn't notice when I change bands on the K3. > - The amp won't let me change bands at all, even when I push its band > buttons! > - When I put the amp into OPER and transmit 15 or 20W from the K3, the > amp doesn't appear to "key" and amplify. It just shows the exact 20W as > passing through (on it's 'power' display.) > > I've verified that the amp's RADIO option is set to 'K3'. > > Does anyone have any ideas? What happens if you connect the K3 directly to the KPA500 (i.e. remove the KAT500 from the picture, temporarily) ? If they still don't cooperate, try the other cable.... 73, ~iain / N6ML ______________________________________________________________ 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 d...@elecraft.com ______________________________________________________________ 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
