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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