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Re: RTTY Activity on AO-40



Emily

You might try Hellschreiber ( Feld Hell mode ). I think you'll find it
tolerates doppler better than RTTY and is more sensitive. The Hell mode is
similar to fax in that each character is "painted" onto the screen - in this
case with an on/off tone similar to CW - duty cycle is less than RTTY as
well - about 25 percent.

For more info see Murry's page at  www.qsl.net/zl1bpu

73, Tony - AA2AE


----- Original Message ----- 
From: "Emily Clarke" <w0eec@AMSAT.Org>
To: "AMSAT" <amsat-bb@AMSAT.Org>
Sent: Wednesday, October 08, 2003 12:51 PM
Subject: [amsat-bb] RTTY Activity on AO-40


>
> We've had an increase in RTTY activity on AO-40 - this morning there were
3
> other active stations besides myself (W0LMD, NX7U and UA0AET).  The
> settings we have been using are
>
> 170Hz Shift
> 45.45 Baud
> Non-Inverted
>
> MixW2 and MMTTY seem to work equally well.  The error rates are very low
> once you get it dialed in.
>
> For those of you who haven't worked RTTY before it's an excellent digital
> mode (and a 2X multiplier if you are in the AO-40 Birthday Bash
> contest.)  It really seems to work much better than phone at high squint
> angles such as the ALON at 14 as it was this morning at 13:00 when I first
> checked in.
>
> If you have never worked RTTY before it's not very difficult.  You can
> identify an RTTY signal in a waterfall display by a very distinctive set
of
> two parallel "tracks" that are 170Hz apart.  Just click on the signal in
> the waterfall and your software should lock onto it and automatically
track
> it (AFC) as the signal frequency drifts because of Doppler.
>
> You need a soundcard interface and software.  MixW2 is very good but the
> registration is $50.  MMTTY is free.  There is also TrueTTY ($39) but I
> haven't  any experience using it.  All of these can be located with a
> Google search.
>
> 73,
>
> Emily
>
>
>
>
> W0EEC - CM87tm
> ARRL - AMSAT - MSARC - ARCA - Project OSCAR
> http://www.projectoscar.net
> http://www.emilyshouse.com/W0EEC
> http://www.experthams.net/ao7
>
>
> ----
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