Hi, Gareth. Well...you certainly have a mystery here. I found the documentation in the Elecraft manual on this subject a little hard to follow; the book by Fred Cady on the K3 is better and, if you'd don't have have it, I highly recommend it.
I think you said on a previous post that you can hear the noise of the SUB when enabling it, then you are correct that there is something blocking the signal from the antenna. Assuming the configuration is correct, it might be the cable inside the K3 that feeds the signal to the SUB. When I opened up my K3 a while back to add a filter to the SUB. I noticed that one of the little coax cables entered the SUB at a pinched right angle (at least it was in mine). While I didn't have a problem, it seemed like it could be a problem if I didn't make sure the little connector was firmly inserted. I'm afraid I'm now beyond my pay grade on this... On Thu, May 28, 2020 at 11:36 AM Gareth M5KVK <[email protected]> wrote: > Thanks Mark > Sadly, Changing the CONFIG KRX3 to be ANT=ATU makes no difference. > > Gareth > > On 28/05/2020, 16:08, "Mark Musick" <[email protected]> wrote: > > HI Gareth, > Sorry, I sent my previous e-mail to you before seeing this one. > You have jogged my memory. > I still believe KRX3 ANT= ATU is correct, but what jogged my memory > Gareth is I believe, and I'll have to check, is that if you have the ATU > installed with the two antenna ports you can use the non-transmit port for > a receive antenna. In other words if you have the ATU and have ANT1 > selected as the transmit antenna you can select ANT2 for receive. It may be > that setting is set to ANT2 when it should be ANT1. However, I believe the > K3 is smart enough to know that ANT1 is the only one available when there > is no ATU installed. > > 73, > Mark, WB9CIF > > -----Original Message----- > From: [email protected] < > [email protected]> On Behalf Of Gareth M5KVK > Sent: Thursday, May 28, 2020 14:53 > To: Nr4c <[email protected]> > Cc: [email protected] > Subject: Re: [Elecraft] Problems with KRX3A > > Hi Bill > The documentation around this is a bit confusing, but my understanding > is that this setting defines where the SUB gets its AUX antenna feed from. > It can either be BNC (the Aux RF socket on the back panel), or (if you have > the ATU installed and therefore two ANT sockets) it can get it from > whichever ANT socket is not being used by MAIN. As I do not have ATU > installed, the only option that works is bnc. > > I can choose either MAIN or AUX ant for the SUB by pressing RX ANT > > Does this make sense? > > Gareth, M5KVK > > On 28/05/2020, 14:03, "Nr4c" <[email protected]> wrote: > > Sorry! > > KRX3 Ant=bnc does not agree with both on MAIN. > > Sent from my iPhone > ...nr4c. bill > > > > On May 28, 2020, at 8:54 AM, Gareth M5KVK < > [email protected]> wrote: > > > > I spent last evening checking the installation of the KRX3A. I > did find one bit of incorrect plumbing (in the cables that connect the > KRX3A to the rest of the K3S): however correcting it made no discernible > difference. > > > > The post-installation setup instructions pass OK and all the > CONFIG menu options seem to be correct: though it is difficult to be sure. > > > > With SUB on, SUB AF/RF at Max and Main AF at min: I get noise > out of the speaker, but no signal: even though A and B are equal and the > Main is definitely receiving a signal. > > CONFIG > > KRX3 Ant=bnc > > L-MIX-R A B > > SPKRS 1 > > SUB AF nor > > > > Looks like an email to support is next. > > > > Gareth, M5KVK > > > > From: Gareth M5KVK <[email protected]> > > Date: Tuesday, 26 May 2020 at 16:05 > > To: "[email protected]" <[email protected]> > > Subject: Problems with KRX3A > > > > Hi there > > I bought a s/h K3S a couple of years ago (SN 10901). It has a > KRX3A installed, but I’ve never tried to use it until now. When I enabled > the sub receiver this morning, I found I was getting no signal. > > > > I’ve checked various CONFIG settings and it’s set to use the > MAIN ANT and it’s AF is independent of the K3S. In an attempt to make > progress, I reviewed the installation instructions. > > > > Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to > display SYN1 and SYN2. I do not see these items. Any idea how to debug this? > > > > 73 > > > > Gareth, M5KVK > > ______________________________________________________________ > > Elecraft mailing list > > Home: > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056307492&sdata=Uo54AiGfy1m5ISLWyMpnApNSzZBOYfX25kdNs0mztTI%3D&reserved=0 > > Help: > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056307492&sdata=F74Vsiv1DxRfd9JHksPBhSXL17%2F4s0egq3SUy%2BetNlY%3D&reserved=0 > > Post: mailto:[email protected] > > > > This list hosted by: > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2F&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056307492&sdata=fg97KwBCsPu7v4bPQHXb1OXSF5s%2FGXcz0TSMgsXsNFo%3D&reserved=0 > > Please help support this email list: > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2Fdonate.html&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056307492&sdata=N0AqFb%2BOeCBuITpoOqjqbyGE%2FXPPwQbpar2sDgeXTEo%3D&reserved=0 > > Message delivered to [email protected] > ______________________________________________________________ > Elecraft mailing list > Home: > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056307492&sdata=Uo54AiGfy1m5ISLWyMpnApNSzZBOYfX25kdNs0mztTI%3D&reserved=0 > Help: > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056317483&sdata=KKSQsBY9oSKfy%2F6Ty5MHzyciBHU8lEGN2GHfFt11mcA%3D&reserved=0 > Post: mailto:[email protected] > > This list hosted by: > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2F&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056317483&sdata=io1Awr3goeS7tsbYuTH1MGolJzUfA33A%2Ftj7p4mALeg%3D&reserved=0 > Please help support this email list: > https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.qsl.net%2Fdonate.html&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056317483&sdata=yQw4SHIq%2BQFrgLtMbWwQY5b8f64B16Lu3muQoMiSxkc%3D&reserved=0 > 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] -- 73, Clark, WU4B Little Pistol With Wires QRPARCI #10815 SKCC #3892 NAQCC #5055 CWOPS #1869 Collins Collectors #AC90-12432 Southeastern DX Club <http://www.sedxc.org> North Georgia QRP Club <http://www.nogaqrp.org> *"It is vain to do with more what can be done with less."* *Attributed to *William of Occam (1288 AD - 1348 AD) ______________________________________________________________ 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]
