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Re: RTTY Activity on AO-40




Hi Tony,

I have tried Hell on a couple of occasions, mostly with Mickey AB4QS and 
Jim KL7QR.  You are right that it works very well, but the speed is very 
low (2.5cps vs 60 cps for RTTY).

73,

Emily



At 03:27 PM 10/8/2003 -0400, AA2AE wrote:
>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
> >
> >
> > ----
> > Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> > Not an AMSAT member? Join now to support the amateur satellite program!
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
>----
>Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
>Not an AMSAT member? Join now to support the amateur satellite program!
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----
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