[Elecraft] Problems with KRX3A
Clark Macaulay
clark.macaulay at gmail.com
Thu May 28 11:47:16 EDT 2020
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 <gareth.m5kvk at gmail.com>
wrote:
> Thanks Mark
> Sadly, Changing the CONFIG KRX3 to be ANT=ATU makes no difference.
>
> Gareth
>
> On 28/05/2020, 16:08, "Mark Musick" <markmusick at outlook.com> 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: elecraft-bounces at mailman.qth.net <
> elecraft-bounces at mailman.qth.net> On Behalf Of Gareth M5KVK
> Sent: Thursday, May 28, 2020 14:53
> To: Nr4c <nr4c at widomaker.com>
> Cc: elecraft at mailman.qth.net
> 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" <nr4c at widomaker.com> 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 <
> gareth.m5kvk at gmail.com> 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 <gareth.m5kvk at gmail.com>
> > Date: Tuesday, 26 May 2020 at 16:05
> > To: "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
> > 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
> > ______________________________________________________________
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--
73,
Clark, WU4B
Little Pistol With Wires
QRPARCI #10815
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