[Elecraft] Problems with KRX3A

Thu May 28 08:24:42 EDT 2020

Thanks, Clark
Switching the SUB between main and Aux makes no difference: there is no AF other than noise and nothing on the S meter when B SET is pressed.

Gareth

From: Clark Macaulay <clark.macaulay at gmail.com>
Date: Wednesday, 27 May 2020 at 16:49
To: Gareth M5KVK <gareth.m5kvk at gmail.com>
Cc: Grant Youngman <ghyoungman at gmail.com>, "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] Problems with KRX3A

Gareth,

I had a similar problem when my K3 returned from the factory after a few updates.  In my case, I had to press and HOLD the RX ANT button.  Don't remember where I read this but it worked.  Toggling this switch changes the Sub Rcvr between the main antenna and the receive antenna as the signal source.

The K3 is a remarkable flexible radio.  With that flexibility comes complexity at times that is hard to fathom--at least for me.

On Wed, May 27, 2020 at 9:50 AM Gareth M5KVK <gareth.m5kvk at gmail.com<mailto:gareth.m5kvk at gmail.com>> wrote:
Great minds, Grant. That's my next step.

As I said in the OP, this was a rig bought secondhand.

Gareth M5KVK

On 27/05/2020, 14:35, "Grant Youngman" <ghyoungman at gmail.com<mailto:ghyoungman at gmail.com>> wrote:

    Have you checked the installation of the receiver module?  Meaning that the two small riser modules that it plugs into are properly seated to the main RF board and the KRX3.  I had a dead sub-receiver problem once.  I had been in the radio at some point to install an update.  When reinstalling the KRX3, I had pinched one of the coax cables that’s in the vicinity of the riser nearest the front of the radio and pulled the cable out of it’s socket when reinserting the KRX3,  far enough not to work, but not so far that I noticed it until the next time I tried using the sub.

    Just one more idea of something to look at.

    Grant NQ5T

    > On May 27, 2020, at 9:21 AM, Gareth M5KVK <gareth.m5kvk at gmail.com<mailto:gareth.m5kvk at gmail.com>> wrote:
    >
    > I tried that, Richard.
    > ANT definitely says MAIN but still no signal.
    >
    > Gareth
    >
    > On 26/05/2020, 18:40, "Richard Thorne" <rthorne at rthorne.net<mailto:rthorne at rthorne.net>> wrote:
    >
    >    Gareth,
    >
    >    Try this.
    >
    >    - Turn on the sub receiver by pushing sub
    >    - Push and hold B Set so the display shows b set
    >    - Be sure the ant shows Main and not AUX.  If it shows AUX push the ANT
    >    button to toggle between the two.
    >
    >    May not be the problem but I've found for some reason my sub receiver is
    >    on the Aux antenna.  My rig doesn't have the ant tuner either.
    >
    >    Rich - N5ZC
    >
    >    On 5/26/2020 11:21 AM, Gareth M5KVK wrote:
    >> Thanks, Richard
    >> There is no ATU, so there is only the one ANT to select. However, I have checked that CONFIG KRX3 has Ant=ATu (even though there is no ATU, only this or BNC are offered as options)
    >>
    >> Gareth
    >>
    >> On 26/05/2020, 16:31, "Richard Thorne" <rthorne at rthorne.net<mailto:rthorne at rthorne.net>> wrote:
    >>
    >>     Gareth,
    >>
    >>     You probably don't have the correct antenna port assigned to the sub
    >>     receiver.  I'm not in front of my rig, but I believe you need to push
    >>     and hold A/B (B Set) to get to the sub receiver, at that point be sure
    >>     the correct antenna port is selected.
    >>
    >>     Rich - N5ZC
    >>
    >>     On 5/26/2020 10:05 AM, Gareth M5KVK wrote:
    >>> 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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Clark, WU4B
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