Hi John!
Welcome to the list....
You'll find much discussion on here ... some of
interest to you and some not, but overall, a great
source of information.
"APF" refers to "audio pass (or peaking) filter",
a feature common on many radios, and sometimes
known by other names, depending on the manufacturer.
It's best represented in the FT-990 and FT-1000D, IMO.
73! Ken Kopp - K0PP
[email protected]
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