The first time I saw the term "passband tuning" was on the Collins 75A4
receiver. It shifted the BFO in one direction and the main PTO in the other
direction. The two were linked together with a mechanical strap. The idea
was that the pitch of the received signal would not change nor would the
act
Jeff,
As far as I know, IF shift and Passbasnd Tuning are the same thing - just
different names for the advertizing hype folks to enjoy.
The major benefit of Passband tuning is that an interfering signal can be
moved off the edge of that reciever passband without changing the pitch of
the receive
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