CW filter weirdness

[Kenneth G. Gordon]

On 12 Feb 2008 at 11:54, Emil Dular wrote:

> OK, I am in need of some erudite advice on a crystal filter anomoly in
> an SB-101.  I used to look at crystal filters as pretty much a "box of
> rocks" put them in like they are marked and they work.

Usually, that is the case, all right.

> Switching the CW filter in, the background noise diminishes, but now
> tuning to zero beat, there is no abrupt cutoff nor is there the narrow
> notch on would expect. For those familiar with Direct Conversion
> receivers the blasted thing is just about like tuning an HW-7.  

I have experienced almost the same thing with a bad crystal 
filter in an HW-101. Replacing the filter cured the problem.

Ken Gordon W7EKB

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