[TenTec] Orion Roofing Filter Cut In
Bill Tippett
btippett at alum.mit.edu
Fri Aug 6 08:31:18 EDT 2004
WA4OEJ:
>My original premise was that in the automatic mode, both the 1.8 and 2.4
kHz filters were too narrow because I have difficulty copying SSB signals
that are less than 1.8 kHz. I think that 1.8 is just too narrow for me and
possibly most SSB QSOs. I first noticed this on a Drake R4-C that I bought
back in the late 70s (no it didn't have the Sherwood mods).
Bernard, here's a tip for using narrow filters on SSB. Actually I
learned
this using the FT-1000MP with both Yaesu 2.0 kHz filters installed. Try
tuning in an SSB signal with moderate DSP bandwidth...say 2400 (roofing filter
selection is not important for this) and PBT = 0. Next narrow DSP until
readability becomes difficult for you. Now adjust PBT = 150 to 200 and you
should hear readability improve. You can now probably decrease DSP BW even
lower. For me, I get "reasonable" (not hi fi) readability down to about
15-1600 Hz Bw if I set PBT to 150-200. Give it a try!
73, Bill W4ZV
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