K3: Sub receiver goes silent at narrow bandwidth

[Elecraft mailing list]

My first post on this didn't make it to the list due to clerical error on my part, so here is attempt two.
The sub-receiver in my K3 is equipped with a 2.7 5 pole filter in position 1, and a 400Hz 8 pole in position 5.  All works well until I narrow the bandwidth to 400 Hz, then the sub-receiver goes quiet (the main continues to work normally.)  I used the K3 utility to set filter 5 bandwidth both narrower and wider, and wherever it is configured is where the receiver goes quiet.
I can't find anything in the archives about this particular problem, but thought I would seek the group collective wisdom before tearing into the radio. Thanks,
Chuck Teague, NN7U
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[wayne burdick]

This could be a bug. Are you using new synths? Diversity mode?

Wayne
N6KR



On Mar 12, 2015, at 9:25 AM, Chuck Teague via Elecraft <[hidden email]> wrote:

> My first post on this didn't make it to the list due to clerical error on my part, so here is attempt two.
> The sub-receiver in my K3 is equipped with a 2.7 5 pole filter in position 1, and a 400Hz 8 pole in position 5.  All works well until I narrow the bandwidth to 400 Hz, then the sub-receiver goes quiet (the main continues to work normally.)  I used the K3 utility to set filter 5 bandwidth both narrower and wider, and wherever it is configured is where the receiver goes quiet.
> I can't find anything in the archives about this particular problem, but thought I would seek the group collective wisdom before tearing into the radio. Thanks,
> Chuck Teague, NN7U
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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[Chuck Teague]

Hi Wayne,
No new synth.  I first noticed the problem when using diversity, but it persists when the receivers are separated.  I'm thinking it is probably a construction or installation problem and wanted to know if there are known errors that would cause this.

NN7U