K3 #170 CW Filter oddity

[Rajiv Dewan, N2RD]

I have 250Hz, 400Hz and 2.8KHz roofing filters installed.  After update
to the latest firm ware I am noticing that the radio goes really deaf
when the 250Hz or the 400Hz filters are used.  I have set the
appropriate gain of 4db and 2db, respectively for the 250Hz and 400Hz
filters.  The FLX FRQ is 0.0 for all.  But the deafness is much more
profound than a few dB.

I noticed that the peak in my signal is not where CWT indicates perfect tune
While I am tuned to a CW signal at 7.02706KHz, I turned on CONFIG:DDS
FRQ and noticed that this frequency changes from 3.581367 MHz to
3.581579 MHz and the radio goes deaf.  No change in tuned frequency.  I
checked that the FL FREQ for these filters is 0.0.  What gives?

Does any of you have the same behavior?

Regards,
Raj, N2RD


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[Rajiv Dewan, N2RD]

Added note: the change in the DDS frequency occurs by just changing the
filter width or selecting the narrower filters.

Raj

Rajiv Dewan, N2RD wrote:

> I have 250Hz, 400Hz and 2.8KHz roofing filters installed.  After
> update to the latest firm ware I am noticing that the radio goes
> really deaf when the 250Hz or the 400Hz filters are used.  I have set
> the appropriate gain of 4db and 2db, respectively for the 250Hz and
> 400Hz filters.  The FLX FRQ is 0.0 for all.  But the deafness is much
> more profound than a few dB.
>
> I noticed that the peak in my signal is not where CWT indicates
> perfect tune
> While I am tuned to a CW signal at 7.02706KHz, I turned on CONFIG:DDS
> FRQ and noticed that this frequency changes from 3.581367 MHz to
> 3.581579 MHz and the radio goes deaf.  No change in tuned frequency.  
> I checked that the FL FREQ for these filters is 0.0.  What gives?
>
> Does any of you have the same behavior?
>
> Regards,
> Raj, N2RD
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com

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