external DSP audio filters (was Re: [RTTY] AA5AU Contest Notes for CQWW RTTY now on-line)

[Jeff Stai WK6I]

At 11:30 AM 10/1/2004, Don Hill AA5AU wrote:
>For anyone interested.
>
>http://www.rttycontesting.com/contestnotes/2004_cqww.htm 

hi Don - thanks for the writeup! And thanks again for the excellent info on 
the rest of your site - it really helped me get my first SO2R attempt going 
for this contest.

Question: you have talked about using NIR-12 DSP filters in your contest 
setup. What are you really achieving with those filters? And how?

It seems to me that MMTTY is a DSP filter in concert with a RTTY demod, and 
if you put another DSP in front of it, you may end up losing some of MMTTY's 
effectiveness by removing information that MMTTY could use.

(As far as cleaning things up for my headphones - my ears can suffer, as 
long as I am getting the best print...:-)

Or are you using it mainly with your external HAL modem?

Or am I missing something? thanks! - jeff wk6i


--
Jeff Stai               jds at twistedoak.com
Twisted Oak Winery      http://www.twistedoak.com/