[RTTY] EU1SA, AA6YQ profiles in MMTTY

[Vladimir Sidorov]

Dave,

As I am quite familiar with the profile (see my signature), let me add a 
couple of words to the discussion.
The "EU1SA" profile is mostly not about decoding, but first of all, it's 
about extra filtering. It makes the MMTTY RX bandwith exactly matching the 
RTTY signal. The brickwall DSP filter with sharp skirts cuts everything off 
but the desired signal. It is clearly seen at the tuning indicator. With 
such a set up you can even use wide SSB filters and still have pretty nice 
results overall. Obviously if you use other filters, as well, it makes the 
overall selectivity even better.

Yet another positive aspect of that is the tuning easiness. It comes from 
the fact that only one and only signal matches the bandwith. The moment you 
tuned to a station, the signal is already readable/decodable and you only 
need a bit of fine tuning, if any.

As you can see, this profile is mostly just another contesting tool. It 
helps quick tuning and easy decoding regardless adjucent QRM. And still, it 
provides the decoder with a narrower bandwith to process, virtually one 
signal a time.

73,
Vladimir VE3IAE aka EU1SA

---




----- Original Message ----- 
From: "Dave Hachadorian" <K6LL at ARRL.net>
To: "RTTY Reflector" <rtty at contesting.com>
Sent: Sunday, January 25, 2009 5:07 PM
Subject: [RTTY] EU1SA, AA6YQ profiles in MMTTY


>I just tried those two profiles, listening to FM1FV run a
> pileup on 14084. Neither profile copied as well as the
> standard rtty profile, which I had running in a separate
> window. Are the EU1SA and AA6YQ profiles supposed to be used
> under special circumstances only?
>
> Dave Hachadorian, K6LL
> Yuma, AZ
>
>
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