[Elecraft] Problems with KRX3A

[Gareth M5KVK]

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