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 elecraftcov...@rfwave.net ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html