[Elecraft] K3s Low sub receiver volume

[Don Wilhelm]

Tom,

Yes, cut those traces if it has not already been done.\
That may or may not solve your problem.

73,
Don W3FPR

On 2/27/2018 9:40 AM, Thomas Doligalski wrote:
> Larry W0LRF wrote earlier this month:
> 
>> There have been a few posts on this subject, but none had answers.
>>
>>   
>>
>>
>> Both my main and sub receiver are on the same antenna.
>>
>> The audio volume from the sub is much lower.
>>
>> The AF for the main is…… let’s say at 9 o’clock….. to get equal volume level from the sum… Sub AF has to be at 3-4 o’clock.
>>
>> RF on both are the same.
>>
>> Any suggestions? Is this normal?
>>
> 
> I have the same problem with K3 #969.
> 
> All was fine when I first installed the KRX3, right after it was released. However, when I installed the new K3SYNA boards the audio problem for the sub receiver manifested itself.
> 
> I have verified that the settings and filters for the sub receiver are the same as the main receiver. Note that the RF signal between the two receivers is identical, as shown on the K3 S-meter and the P3 display.
> 
> Recently I noted the latest KRX3 installation manual (downloaded from electraft.com) has a section entitled "Checking and Modifying Resistor R91 and DAC Input Circuits”. The manual I followed when installing my KRX3 only had a similar section entitled “Checking and Modifying Resister R91”.
> 
> The latest KRX3 installation manual states that the missing step involves cutting two traces on the main board board to the left of R91, with the justification that “This modification ensures the digital-to-analog converters (DACs) always receive the proper signal levels. It has been incorporated into all later K3s.”
> 
> Could this be the cause of my Low sub receiver volume problems? Should I cut these traces now?
> 
> Thanks and 73!
> 
> Tom W4KX
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to donwilh at embarqmail.com
>