Sounds like a marginal power supply bypass though it could be a bad
solder connection of a shunt resistor in the filter RC components around
the OP amp.
73, Jerry, K0CQ
On 1/1/2011 5:54 PM, Curt wrote:
> I own a 208 CW filter used with an Argonaut 509. Sometimes on turning the
> rig on with the filter turned on, the audio will squeal. Turning the filter
> off eliminates the hown, but it returns when the filter is turned on again.
> Only cure is to turn the rig on and off, sometimes several times. Seems the
> problem is in the filter itself, does this sound like a marginal cap in the
> filter feedback circuit?
>
> Thanks, urt KB5JO
>
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