Good for you! The 221 was a special version of the 219 designed for a lower
center frequency,
where my ear can dig out signals easier. I have one of the very first 221
filters here and I find it
very helpful in high noise situations. It is the same bandwidth as the 219,
250 Hz, but just a lower
center frequency. Nice to have both in there. I use a 500 Hz filter next to
my 221.
Clark
WA3JPG
On Mon Nov 7 18:17 , Able2fly@aol.com sent:
>An Omni 6 of mine came with a 219 filter installed in the 9MHz N1 position
>and a 221 in N2.
>
>The 219 is the optional sharp cw filter, but what is the 221's intended
>purpose? (I like it for pulling weak CW out of QRN)
>
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