[RTTY] A repository of (poor) RTTY recordings?

[DJ3IW Goetz]

Hi,
let me add some comments about RTTY copy with the PTC-II.
Walter, DL4RCK and myself bugged the programmmer of the PTC-II
firmware about this less than optimal RTTY performance several
times many years ago. Although he did listen to our comments he
freely admitted that their primary interest was Pactor (at that
time) level 2.
I noticed that the PTC-II when set to standard 170Hz shift copies
RTTY much better than with the 200Hz setting required for Pactor 2.
In contesting (WL) I use the PTC-II as my main RTTY machine in FSK
mode and MMTTY as a second decoder. Under critical condx MMTTY is
about 80% better than the PTC-II but there are about 20% of cases
when the PTC-II has better copy.
One thing I noticed all the time: When people start their transmission
without CR/LF and/or additional spaces, the PTC-II (MixW too) always
misses the first 2 or 3 characters and prints garbage instead whereas
MMTTY has almost all the time perfect print.

73 de Goetz
dj3iw at t-online.de
----- Original Message -----
From: "Ekki Plicht" <ep at plicht.de>
To: <RTTY at contesting.com>
Sent: Tuesday, April 20, 2004 9:09 PM
Subject: Re: [RTTY] A repository of (poor) RTTY recordings?


> Am Di April 20 2004 22:53 schrieb Kok Chen:
> > It is perhaps useful for the RTTY community to have available a
> > "standard" collection of digitized sound files of various RTTY signals.
>
> Good idea.
>
> [snip]
>
> > Anyone willing to host such sound files on their web site?   Equally,
> > are people willing to contribute some sound files?
>
> Sure, I still have plenty of space left on my domain. I don't have sound
files
> (yet), but will try to gather some.
>
> FWIW, a while ago I compared MMTTY against the PTC2 pactor controller by
SCS.
> MMTTY was in most cases better than the PTC2 in decoding fluttery polar
> signals. Hard to swallow when you think about spending 800+ Euro for that
> PTC2, which has quite substantial DSP power. But I guess the developers of
> the PTC focus on Pactor, the RTTY part of the software hasn't been touched
in
> years.
> And MMTTY is also better than the RTTY decoder built into the IC-756Pro (not
> 2). Even more expensive, but then I didn't buy it to decode RTTY...
>
> 73,
> Ekki, DF4OR
>
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