[Elecraft] K3S Sub Receiver stopped working

[Peter Dougherty]

This is probably a "101" level thing check, but can you confirm that the
sub-RX setting of "MAIN" has stuck? It's happened to me several times in the
past that it's changed to AUX seemingly on its own. 

I thought I had killed my Sub-RX just a couple of weeks ago and this was
indeed the case.

 - pjd

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of KE8G
Sent: Friday, March 22, 2019 12:00 PM
To: Elecraft-K3 at groups.io; Elecraft <Elecraft at mailman.qth.net>
Subject: [Elecraft] K3S Sub Receiver stopped working

Hi All,
I need some suggestions on where to start trouble shooting.  I looked at
Nabble and I have checked all that is listed there and no luck.

The sub receiver was working perfectly.  I took the radio apart to add some
new filters to the sub receiver.  It originally had two of them; configured
as 2.8Khz, then a 400Hz right next to it, and then 3 blank slots.  I removed
the 400Hz, the the filters are in the following order; 2.8Khz, blank slot,
1.0Hz, 400Hz, and finally 250Hz in the 5th slot.

I used the K3 utility to configure them, with the appropriate settings for
each filter.

When using the radio, I have both the main and sub receiver on the Main
antenna.  If I tune to a strong signal on the band, using just the main
receiver, I hear on both sides of the headphones.  When I engage the sub
receiver, I still hear the signal in the left ear, but the right ear goes to
just white noise.

When the sub receiver is engaged, I can hear sounds in the left ear when
pushing any buttons on the radio.