I was surprised and pleased with the model 221 CW filter and echo the
other comments. It is my number 1 filter for digging out the hard to hear
signals. Head and shoulders easier to listen to than other Ten Tec or
INRAD filters, and not just by a little, it is quite a measure for my
ears. If you like a lower tone than 750 Hz, give one of these a try.
Clark
WA3JPG
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