K3 - Volume loss through filter???

[Al Dynarski]

I recently installed the sub-receiver in my K3 and when comparing the filter performance between the two I realized that I have a
problem with one of the filters in the main receiver.  All filters are 8-pole and each receiver has a 2.8khz, 1.8khz and 250hz
filter.  The filter configuration is exactly the same for both receivers.  

 

Listening to the sub-receiver and narrowing with the Width control I can hear the change as I pass from filter to filter and the
volume stays the same for each filter.  However on the main receiver as I pass from to 2.8khz  to the 1.8khz, the volume drops by
about 2/3 and as I pass from the 1.8khz to the 250hz, the volume returns to the same level as the 2.8khz filter.  I suspect that
either the 1.8khz filter has a problem or I may have a problem with dirty contacts.

 

Before I open up the radio and try swapping the 1.8khz filters to see if the problem follows the filter, I wanted to be sure I was
not missing some other cause or configuration issue. Any comments would be appreciated.

 

Thanks,

Al  W7SYK

 

 

 

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[Vic Rosenthal]

There is a separate gain setting for each filter, which you can see in the K3 Utility
configuration function (you can use the menu too, but the utility is easier). If this is
significantly different you might have a problem.

On 2/3/2012 10:05 AM, Al Dynarski wrote:

> I recently installed the sub-receiver in my K3 and when comparing the filter performance between the two I realized that I have a
> problem with one of the filters in the main receiver.  All filters are 8-pole and each receiver has a 2.8khz, 1.8khz and 250hz
> filter.  The filter configuration is exactly the same for both receivers.
>
>
>
> Listening to the sub-receiver and narrowing with the Width control I can hear the change as I pass from filter to filter and the
> volume stays the same for each filter.  However on the main receiver as I pass from to 2.8khz  to the 1.8khz, the volume drops by
> about 2/3 and as I pass from the 1.8khz to the 250hz, the volume returns to the same level as the 2.8khz filter.  I suspect that
> either the 1.8khz filter has a problem or I may have a problem with dirty contacts.
>
>
>
> Before I open up the radio and try swapping the 1.8khz filters to see if the problem follows the filter, I wanted to be sure I was
> not missing some other cause or configuration issue. Any comments would be appreciated.
>
>
>
> Thanks,
>
> Al  W7SYK
>
>
>
>
>
>
>
> ______________________________________________________________
> 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

--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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[WE5ST]

Is the pre-amp in the same state for both receivers?




________________________________
From: Al Dynarski <[hidden email]>
To: [hidden email]
Sent: Fri, February 3, 2012 12:05:12 PM
Subject: [Elecraft] K3 - Volume loss through filter???

I recently installed the sub-receiver in my K3 and when comparing the filter
performance between the two I realized that I have a
problem with one of the filters in the main receiver.  All filters are 8-pole
and each receiver has a 2.8khz, 1.8khz and 250hz
filter.  The filter configuration is exactly the same for both receivers.  



Listening to the sub-receiver and narrowing with the Width control I can hear
the change as I pass from filter to filter and the
volume stays the same for each filter.  However on the main receiver as I pass
from to 2.8khz  to the 1.8khz, the volume drops by
about 2/3 and as I pass from the 1.8khz to the 250hz, the volume returns to the
same level as the 2.8khz filter.  I suspect that
either the 1.8khz filter has a problem or I may have a problem with dirty
contacts.



Before I open up the radio and try swapping the 1.8khz filters to see if the
problem follows the filter, I wanted to be sure I was
not missing some other cause or configuration issue. Any comments would be
appreciated.



Thanks,

Al  W7SYK







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