> There is an article on such a filter in the February, 1986 QST, p15ff
> written by N4UU.
>
> It splits the audio and processes it in two channels. There is a CW version
> and an SSB version.
I recall using such a device many years ago - no idea how it worked, but
it used stereo headphones (or loudspeaker) to spread the CW between left
and right depending on audio frequency. I can remember working a
contest, and saying to the other op "You copy the left one, I'll take
the right one."
It was broadbanded - several kHz wide.
I preferred to put my head inside a large cone speaker to copy the weak
ones.
73,
Keith
G3OIT GW3OIT G-UTSY at EGMC
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