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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