In a message dated 1/15/01 4:16:11 PM Pacific Standard Time,
Rob.Hammond@eu.sony.com writes:
> I was thinking of upgrading both
> Radios with INRAD's Crystal filters for SSB , They offer a variety of
> different widths. Can you go too narrow ? . What would be the best choice
> for contesting ?
I went through the debate of whether to get the 2.1 kHz set or the 1.8 kHz
INRADs
for an FT1000MP
about a year ago. I took advice from the group and there was about a 50/50
split
between the two
options. I plumped for the 2.1 kHz option on the basis that the skirts should
be steep enough to allow
the SHIFT/WIDTH control to give me the extra coverage down to 1.8 kHz and
beyond.
Also I had
spent a lot of time in the past using a pair of Yaesu 2.0 kHz in FT1000Ds and
felt that the
constrained audio response (and maybe passband ripple - never measured it
accurately,
but didn't
look very even on CW) was making for a higher than wanted busted call rate
(well
- that's my excuse!).
Having now used the pair of 2.1 kHz filters in CQWW SSB I actually wish I'd
gone for the 1.8 kHz
option. The slopes are not steep enough to compensate and I didn't find the
ability to kill QRM off the
sides as good as the 2.0 kHz Yaesu pair in the old FT1000D.
As an aside, on CW, I added a 400 Hz 455 kHz IRC filter to the existing 500
Hz Yaesu 8.2 MHz
filter and this is excellent - much better than another FT1000MP with the Yaesu
500 Hz pair. I must
compare the SSB performance across the two rigs.
73,
Andy Cook, G4PIQ.
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