[TenTec] Narrow Filters on Omni VI

[Mark Erbaugh]

I'm trying to set up my Omni VI (opt 3) for the upcoming RTTY contest.  I
have 250 and 500 Hz filters in both IFs. The 9 MHz filters are centered for
CW.

What the difference in using a narrow filter in the 9 MHz IF vs the 6 MHz
IF. I do realize that I can center the passband of the 6 MHz with the PBT
adjustment.  Would performance improve if I cascaded filters using a 250 in
each IF. Since I'm can use AFSK that should be possible, I just won't be
using "standard" RTTY tones.

I understand that if I want to use FSK, I'd have to use the 6 MHz filter and
offset it with PBT. The passband of the 9 MHz filter is not going to pass
standard RTTY tones.

Also, what are the other pros and cons of using FSK vs AFSK? I realize that
with AFSK, I have to worry about the computer audio level and that it
probably takes a little more horsepower from the computer / soundcard to
generage the AFSK tone, but is there anything else to consider?

73,
Mark