CW filter weirdness

[Kenneth G. Gordon]

On 13 Feb 2008 at 21:28, Chris Iwata wrote:

> But, rather than having a wide open
> response, I would  think a defective filter would have virtually no
> response.

Not so, Chris. 

I have a correct (non-SB-104) Heathkit 400 Hz CW filter in 
my HW-101 that exhibits very high insertion loss, and a very 
strange passband. I think one of the crystals or another 
component in the filter is toast.

I have another filter to replace it with asap.

My SB-102 exhibits none of these symptoms when switched 
to the CW position and it uses essentially the exact same 
method to switch the exact same model filters as the HW-
101.

Ken Gordon W7EKB

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