[1000mp] AF filter.

[Pete Smith]

At 07:29 AM 7/19/03 +0100, Roger wrote:
>   I see from the RSGB Radcom that an AF filter is being advertised for=
 =A354.
>I would appreciate any
>information on this from somebody who has fitted one.


There are a lot of different kinds of audio filters.  In fact, MFJ's very=20
first product was an active audio filter using op amps.  Before that, there=
=20
were passive filters using old telephone toroids and capacitors.  Then=20
there was something called a switched capacitor audio filter (or SCAF)=20
which had a brief vogue.  All are useful on CW, but whether any of these=20
outboard units would approach the performance of modern DSP strikes me as=20
unlikely.

Any more details?

73, Pete N4ZR
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