Wonder if Radio Shack 21-543 uses switched capacitor filters as basis.

Google no direct help but does show Rad-Shack parts list that might
be plumbed for an answer.

Would like to move the CW center-freq. around the 750 hz place it's
currently located - per '95 Handbook wherein only a pot's needed with the
MF8CCNs in a design there.

Thnks for the read OMs

Marty aa4rm

PS... now that I've got ur attn, anyone know a 'filter' that hunts
out a hetrodyne freq. and nulls it automatically?



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Time flies like an arrow, fruit flies like a bananna / Groucho

Edward Knobloch wrote:
Netnews Marty aa4rm wrote:


PS... now that I've got ur attn, anyone know a 'filter' that hunts
out a hetrodyne freq. and nulls it automatically?


Hi, Marty

I'm the happy owner of a "Magic Notch" filter, which goes
between the receiver audio output and speaker. It has a
built-in 2 Watt audio amplifier, and requires a 12 VDC wall wart.


Tnx Ed, et al.

Duly noted are the "magic notch,' the Datong FL1/3, & the "monitor's pal"
hetrodyne hunter-killers.

Tnx

But, still haven't got an answer about the Rad-Shark's guts & possible
mod. But perhaps that's a futile quest.

Why do I ask at all? Well to replace the lost adjustable-peak audio
filter in a Navy RAL regen. That's why.

Again, tnx

Marty

Edward Knobloch wrote:
Netnews Marty aa4rm wrote:


PS... now that I've got ur attn, anyone know a 'filter' that hunts
out a hetrodyne freq. and nulls it automatically?


Hi, Marty

I'm the happy owner of a "Magic Notch" filter, which goes
between the receiver audio output and speaker. It has a
built-in 2 Watt audio amplifier, and requires a 12 VDC wall wart.


Tnx Ed, et al.

Duly noted are the "magic notch,' the Datong FL1/3, & the "monitor's pal"
hetrodyne hunter-killers.

Tnx

But, still haven't got an answer about the Rad-Shark's guts & possible
mod. But perhaps that's a futile quest.

Why do I ask at all? Well to replace the lost adjustable-peak audio
filter in a Navy RAL regen. That's why.

Again, tnx

Marty