Hi John -
Thanks for the detailed reply. First, I am working with my FT 817 for
field use. I can get the 300 Hz or 500 Hz Collins mechanical filters
for the CW position, but I need to go back and see if I can put the
filter in line for any more and how that works. There is a CAT program
that might solve my problem. After that, I plan to upgrade my OMNI VI
for these modes, so your info is very useful to me. Where do I find
MixW and do you know if they have a Mac or Unix version? I'll go search
on the net to see what I find.
Clark
WA3JPG
On Wednesday, February 12, 2003, at 01:45 PM, John Clifford wrote:
What radio are you using?
With my Omni VI/Opt1 I use the 9 Mhz 500 Hz RTTY filter for PSK31 and
find I
get great results with it. I've written a macro in MixW that centers
that
signal in the filter passband and then selects the narrow filter. It's
great when I find a very weak trace on the screen that is being hidden
by
stronger signals... the formerly weak signal suddenly becomes very
decodable.
I have tried the other filters, and have found the 6 Mhz 250 Hz filter
to be
of use as well, and have another macro set up for it. But, I find
that I
can combine passband tuning with the 9 Mhz narrow filter and pretty
much get
rid of any interfering signal.
Hope this helps,
- jgc
John Clifford KD7KGX
Heathkit HW-9 WARC/HFT-9/HM-9
Elecraft K2 #1678 /KSB2/KIO2/KBT2/KAT2/KNB2/KAF2/KPA100
Ten-Tec Omni VI/Opt1
email: kd7kgx@arrl.net
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]On Behalf Of Clark Savage Turner
Sent: Wednesday, February 12, 2003 11:30 AM
To: tentec@contesting.com
Subject: [TenTec] filters for digital modes and qrp
I plan to try out some digital modes and wonder if 500 Hz filters are
the narrowest reasonable bandwidth to use. Would a 250 Hz filter rule
out PACTOR? I haven't operated these modes but want to try, thinking
about filters.
Clark
WA3JPG
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