B i l l E v e r h a r t wrote:
On Wed, 18 Aug 2004 13:28:20 GMT, Doug Smith W9WI
wrote:


IF shift allows continuous adjustment of the passband, rather than just
selecting upper or lower. You could knock down interference 2KHz below
the desired station without deleting the entire lower sideband. Or,
while monitoring a SSB station.


Could you knock out the 2KHz interference with a notch filter as well?

Only if it's a single-frequency carrier. (like a Morse Code signal, or
a spurious carrier from a computer or something like that) A notch
filter removes a particular frequency very well but doesn't do much
against signals on other frequencies. Another SSB signal 2KHz below the
one you're wanting to monitor cannot be "notched".
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com