Andy, You'll find the band outputs on the KPA500 aux connector (BAND0-3) are quite reliable and fast when it comes to detecting band change outputs. They appear to be flipped/set quite early in the band change sequence/exchange between the K3 and amp, certainly before RF is applied (yay !). At least I've not caught my K3/KPA500(s) doing anything silly in this regard yet.
My only gripe with the BAND outputs is that 60m was encoded as 0000 and not 1111 on this 4-bit interface, which means telling the difference between the amp being physically OFF and/or on 60m requires a separate monitoring circuit... >:| 73 Matthew VK5ZM On 30 April 2018 at 09:07, ANDY DURBIN <a.dur...@msn.com> wrote: > Don, > > > Thanks for the reply. > > > I'm familiar with the PC interface and have, in the hope of tracking down > a problem, built a logger that uses that bus to interrogate the KPA500 at > 10 Hz. I was hoping the AUX bus would give a faster detection of a > spurious band change than my 10 Hz interrogation ^bn;. I'll look at the > bus with my DSO but I have already been given information than suggests its > data rate will be too low to be useful. > > > I may have to resort to instrumenting the shift register signals from the > front panel to the LPF but I was hoping to avoid that. > > > 73, > > Andy > > > > > ________________________________ > From: Don Wilhelm <donw...@embarqmail.com> > Sent: Sunday, April 29, 2018 2:45 PM > To: ANDY DURBIN; elecraft@mailman.qth.net > Subject: Re: [Elecraft] KPA500/K3 AUX bus specification > > The AUXBUS protocol is Elecraft proprietary and is not published. > It is the single wire communications between the K3 and its options, > both internal and external. > > The K3 Programmers Reference and KPA500 Programmers Reference gives you > commands that can be issued from a PC or other connected computer - > those commands are quite extensive and can give you complete control > from a PC. > > 73, > Don W3FPR > > > > From: elecraft-boun...@mailman.qth.net [elecraft-boun...@mailman.qth.net] > on behalf of ANDY DURBIN [a.dur...@msn.com] > > Sent: Sunday, April 29, 2018 3:59 PM > > To: elecraft@mailman.qth.net > > Subject: [Elecraft] KPA500/K3 AUX bus specification > > > > Can someone please point me to a definition or specification for the > KPA500 - K3 AUX Bus. I have the KPA500 Programmer's Reference but this > appears to only cover the KPA500 - PC interface. > ______________________________________________________________ > 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 vk...@bistre.net > ______________________________________________________________ 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
