[Elecraft] K3 - NO SSB TX

[Bruce Meier]

Joe,

After I found out that by changing the Width beyond 3.0kc SSB RX came back,
I suspected a problem with filter configuration,  so I checked via the K3
Utility (Configure Crystal Filters) and via the K3 itself.  In both cases
FL1 was ON, FLTx SB = FL1, FL1 FRQ = -.88, FL1 BW = 2.7.     

However, I did not try to reset anything, just verify the settings were
correct.

73,
Bruce - N1LN



Date: Sat, 17 Jul 2010 12:08:06 -0400
From: "Joe Subich, W4TV" <lists at subich.com>
Subject: Re: [Elecraft] K3 - NO SSB RX
To: elecraft at mailman.qth.net
Message-ID: <4C41D566.6060606 at subich.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed



Sounds like something is wiping out (or changing) the SSB filter
Offset.  Before restoring the configuration, check the offset
(CONFIG: FLx FRQ) and see if it is correct.  You can also try
resetting just the filter offset (from the radio) and see if
that restores SSB Receive.

73,

    ... Joe, W4TV

On 7/17/2010 9:15 AM, Terry Posey wrote:
> I think you are not alone, Bruce.  I have experienced a similar SSB RX
audio
> loss on several occasions. And there seems to be no recovery other than a
> RESTORE CONFIGURATION.
>
> In my case, I keep my K3 M1 memory loaded with VFO A 50.110 USB and VFO B
> 50.125 USB, and M2 memory loaded with VFO A 50.100 CW ALT and VFO B
50.110.5
> CW ALT. My loss of SSB RX audio seems to occur if I am working CW with the
> K3, then press the M1 memory and hurry-press the A/B button before the M1
> memory change sequence is completed (the K3's frequency and mode changes
> from memory is not instantaneous).  After the K3 settles down, the USB RX
> audio is completely dead, but the CW, DATA, AM, FM modes audio still work.
> I have also cycled through the bands, and the USB RX audio is dead on each
> band.  The USB TX audio seems to work; however, I have not tested for that
> extensively.  I have found no way to restore the USB RX audio other than
to
> RESTORE CONFIGURATION.  This problem would be most inconvenient if it
occurs
> during a contest or a DXpedition.  Do not leave home without your K3
> Utility.
>
> Something for Wayne to ponder over the weekend.
>
> 73, Terry K4RX
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bruce Meier
> Sent: Saturday, July 17, 2010 8:04 AM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 - NO SSB RX
>
>
> Now that this problem has occurred twice it is time to ask if I am alone.
>
> One of my K3s lost all audio on SSB RX.  It still worked fine on CW.  TX
was
> fine on both modes.  However, if I increased the Width beyond 3.0kc SSB RX
> audio came back.  When the Width was decreased below 3.0kc the audio was
> again gone.  The problem was not band specific - it occurred on all bands.
> This happened last week during the IARU and again about 10 minutes ago.
> Last week it occurred while the K3 was powered up and being used.   This
> week, when I it was powered on, it came up in this condition.
>
> The fix appears to be a RESET.  (Push NORM - power up - EE INIT) Then I
run
> the RESTORE CONFIGURATION from the K3 utility program.    The K3 is then
> back to normal.
>
> My concern here is two fold.  1. This should not be happening. 2. This
issue
> could be the beginning of a larger issue that won't be fixable with a
RESET.
>
> Has anyone else had this issue?
>
> K3 # 1193
> Firmware: 3.97
> Filters: 2.7kc, 400hz, 250hz
>
>
> 73,
> Bruce - N1LN