Posted by
Scott Prather-2 on
Feb 07, 2010; 9:37pm
URL: http://elecraft.85.s1.nabble.com/K3-in-a-cw-pileup-needs-work-tp4523884p4531190.html
As a follow-up to the e-mails that were sent to the reflector and those that
I received privately, I wanted to let the group know that last night I
resolved the problem I was having where audio would be lost in LSB, USB and
AM when the K3's bandwidth was set to 2.8 kHz while running FW 3.30.
As I mentioned yesterday, on Friday I received the DSP upgrade, so before
installing it I re-loaded the K3 with FW 3.76. After doing so, the problem
remained but now the audio would cut off at a BW of 3.0 kHz, returning at
3.1 kHz in all three modes. The full range of bandwidths available in the CW
and DATA modes were unaffected. I replaced the DSP board and the problem
remained (as expected). However, when I performed an EE Init, I found that
everything began working properly. As soon as I re-loaded my latest
configuration file, the problem returned. Unfortunately, my next-newest
configuration file was dated August 09 and turned out to be incompatible
with 3.76, so I manually re-configured the radio from scratch. All is well
now.
Thanks to all those who responded.
Scott
N7NB
-----Original Message-----
From: K6LE [mailto:
[hidden email]]
Sent: Sunday, February 07, 2010 8:18 AM
To: WW2PT
Cc: Scott Prather; Elecraft Reflector
Subject: Re: [Elecraft] K3 Loses RX Audio at BW of 2.8 kHz
Bingo!
I restored my last config (from 1/20) and problem is gone..
Now I am trying to noodle over what configuration item may have changed
during the beta upgrade that caused it.
At any rate, all is good now!
Rick
K6LE
On 2/6/2010, at 11:07 , WW2PT wrote:
> My K3 was working fine last time I used it. Tonight I turned it on and
> noticed a similar problem -- no audio in USB or LSB modes whenever I
> set the width to 3.00 kHz or less. Tried downgrading from 3.76 to 3.63
> but no change. Checked all filter settings in the config menu, nothing
> out of place. All other modes were fine.
>
> On a hunch, I restored my last configuration backup file. It worked!
> Everything seems to be behaving well again.
>
> 73 de WW2PT
>
>
>
>
> On Feb 6, 2010, at 12:45 AM, Scott Prather wrote:
>
>> All: This evening when running FW 3.76 I'm seeing a problem with my
>> K3 that
>> I've never seen before.
>>
>> When the K3 is in the LSB, USB or AM mode, adjusting the bandwidth
>> down to
>> 2.8 kHz will result in total loss of audio, even though the S-meter
>> continues to read incoming signal strength. I've tried an EE-Init and
>> reloaded the configuration, but the problem remains. Thinking this
>> might be
>> related to 3.76, I went back to 3.30 and I have exactly the same
>> problem. If
>> I turn on the sub receiver and change its BW using BSET, it loses
>> LSB, USB
>> and AM audio at 2.8 kHz as well. To get audio to return, all I need
>> to do is
>> change the BW to 2.9 kHz or greater on either the main or the sub.
>>
>> Looking through the reflector postings, it looks like someone saw
>> something
>> similar to this in the DATA mode a few months back, and pressing the
>> A/B key
>> would clear it. However, in my case the only way I can restore audio
>> is to
>> change the BW to 2.9 kHz or greater. In the CW and DATA modes, the
>> audio
>> does not drop out at any bandwidth setting.
>>
>> Does anyone have a suggestion as to what might be going on?
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