The auto notch is to eliminate steady tones, like a tuner-upper. It sees CW
as one of those steady tones it should eliminate. The manual notch is for
other offensive stuff, and as has been noted, requires a fine adjustment to
get it just right.
73 Doug W5GA
>> I have a 'new-to-me' Omni VI, Fac III option. I don't yet have a manual,
>> but one is on the way. Can someone explain to me in simple terms how and
>> when to use the Notch Filter on Auto and Manual? When I turn the outer
>> Notch dial on manual, on a given cw signal, nothing happens. When I place
>> the Notch on Auto, (the light comes on), it makes the signal 'thump' and
>> become unreadable. I have a full complement of cw filters.
>>
>> Many Tnx,
>> Steve
>> ke1lg
>
> No automatic notch filter can tell the difference between the CW you
> want to copy and QRM. They are all tones. Manual you have to tune
> something to put the notch on ONE QRM tone, I'm sure. At least that's
> how its worked in my Corsair II and other receivers, like my 75S-3B.
>
> 73, Jerry, K0CQ
>
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