[Elecraft] [Fwd: K3 #202 - Firmware 3.23, 3.25 Problem and Solution]

[Ken Wagner K3IU]

G'morning, all:

This is an email that I just sent to K3 Support.

If you haven't backed up your K3 using the K3 Utility program, this may 
provide you motivation to do so. I don't know precisely what was wrong 
with my K3 or what in the backed up configuration corrected the problem, 
but restoring the backup fixed the problem.

73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-------- Original Message --------
Subject: 	K3 #202 - Firmware 3.23, 3.25 Problem and Solution
Date: 	Mon, 17 Aug 2009 08:51:24 -0400
From: 	Ken K3IU <kenk3iu at cox.net>
To: 	K3 Support <k3support at elecraft.com>



G'morning, Gents:

An interesting problem reared its head this morning when I turned on the 
K3 with 3.25/2.21 installed.

When I switched mode to SSB (either USB or LSB) this morning there was 
no audio output. S-meter action continued to indicate input and all 
other modes produced normal audio output. It has worked fine in this 
mode because I was checking the Auto-Notch feature using SSB modes 
before this. I disconnected everything from the backplane except the 
power cord and the antenna. Still no audio on SSB modes. I went through 
all the CONFIG menu items and everything was as before. I particularly 
looked at the Squelch items and squelch was set to FM Only with level as 
00.  When I checked CONFIG:PB CTRL, even though I had set it for 
Shift=.05 while in CW mode, it indicates Shift=.01 when in SSB mode. I 
am unable to change that so it is .05 in SSB mode. Not sure if that is 
pertinent or not but it doesn't seem right.

I did a complete reload of all the 3.25 firmware files and still no SSB 
audio. The problem presents itself on both the main and the sub Rx. I 
checked the filter setup using the K3 Utility and there have been no 
changes, i.e., appropriate filters are still set up for SSB. SSB 
Transmission is normal when monitored in my K2.

I decided to regress to 3.23/2.19 and see what happened. No change... 
still no audio in SSB modes.

I regressed to 3.19/2.17 and the SSB mode audio is normal.

I removed the bottom front panel and inspected the resistor/diode 
components and the jumper for Rx Front End Protection that I installed 
per  the Application notes for 3.25 changes.  Everything looks and 
measures correctly.

I have made all mods not excluded by serial number on this K3 (#202).

I just re-loaded 3.25/2.21 and still no SSB Rx audio.

I just remembered that I had done a backup of the configuration 3 days 
ago using the K3 Utility, after installing 3.25. After running the 
Restore program in the K3 Utility just now to restore that backup, I 
have audio on both SSB modes. And... the CONFIG: PB CTRL now indicates 
Shift=.05 in SSB mode and .01 in CW and Data modes.

So whatever happened overnight was corrected by restoring the last 
backup. Of course, I haven't a clue as to what was wrong and what in the 
restore fixed it, but K3 #202 is back to normal ops now.

73.
Ken Wagner K3IU
K3 #202
Portsmouth, RI