I don’t think your point #1 is valid. The K3 will cause the KPA to change bands when it does a band change and sends out changed bits on the BAND signals. If you don’t change bands on the K3, then the KPA won’t have a reason to change. The problem with this, when RADIO = K3, is that tapping a band button on the KPA _will_ send an Auxbus command to the K3 indicating that a band button has been pressed. The key here is then to set the RADIO setting to something else. If you do not use the KPA to select a band on the K3, then try setting RADIO to BCD. Then, when the K3 changes bands, it will tell the KPA about the new band by changing the BAND signals, but the KPA will not send anything on the AUXBUS that causes the K3 to perform a band change.
The KPA500 is very versatile. If you make the right selection of its settings, it will do what you want. But it cannot overcome that PTT signal being held low by the K3. Use the KPA manual as a guide to tell you what you need to set and try it. And, for more information on this specific subject, get Fred Cady’s book on the KPA500. It has a lot of good info. I still think that the use of the key block adapter along with a switch to select which PTT signal goes to the KPA500 & KAT500 would be your best bet. Also, buying a house without those restrictions… ;-) For the those lurking, Jim and I have been friends for a long time, both members of the Northern California Contest Club. We escaped CA about the same time, commiserating on how expensive it was to move. At least I don’t have any restrictions now. It helps to be married to a ham who understands these things… ;-) Keep at it, Jim. I am sure we can devise a good solution for using both rigs. 73, Jack, W6FB PS. Watch for us in the La QSO Party on Saturday. It should be fun! > On Apr 1, 2022, at 6:47 PM, James Bennett via Elecraft > <elecraft@mailman.qth.net> wrote: > > Chuck, > > Just gave it a try. No joy, same result - lowered rx signal strength on the > IC-705. Jack indicated that the K3 sets the Vcc rail to zero volts on power > off, and that is causing the amp to go into Operate mode. > > I see the following options - > > 1. Always put the K3 on the same band as the IC-705 if I want to run QRO with > the 705. > > 2. Never use the 705 in QRO mode. > > 3. Disconnect the K3 from the system, sell it, wait for the K4D to be > delivered, and use the 705 all by itself with the amp and tuner in the mean > time. > > Option #1 works but is a minor PITA. Option #2 - maybe. Option #3 - probably > the choice to make, as the K3/P3 was going to be sold anyway, in anticipation > of the K4D arrival. Just hoping I’ll live long enough to see the new radio > delivered. > > Oh well, nothing in life is simple. At least I’ve got options and am able to > get on the air. :-) > > > > >> On Apr 1, 2022, at 3:51 PM, Chuck Chandler <chandler...@gmail.com> wrote: >> >> Hhhmmm... I'm coming late to this thread, as I wasn't paying attention >> before. >> >> Please forgive me if I have missed something but - >> >> I have, in the past, used both a K3S AND an old Yaesu FT-101ZD with my >> KPA/KAT 500 power combo. I *THINK* that is similar to what Jim is trying >> to do. >> >> Here is what I found, if it helps. >> >> When the K3S is on, it communicates with the KAT/KPA. However, when it is >> turned off, it leaves the KPA/KAT in a state where they are not prepared to >> accept input. I forget the specifics, because I have since provided the >> 101ZD with it's own amp. >> >> Try this - Turn off the K3S. Turn off the KPA. >> >> Turn the KPA back on, with the other radio connected to the RF input and at >> least an RCA keyline connected for the PTT. See if it works. >> >> IIRC, this was what I had to do. >> >> If anyone needs the specifics as to WHY it works that way, I can try to dig >> out the old emails with Elecraft. And, it's been a while so I may be >> mis-remembering the details. But, I know it worked. >> >> I hope this helps... >> >> 73 de Chuck, WS1L >> > ______________________________________________________________ > 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 jackbrin...@me.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
