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PA2AGA > HDDIG 22.06.00 02:58l 225 Lines 7164 Bytes #-9428 (0) @ EU
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Date: Wed, 21 Jun 00 18:52:29 MET
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From: pa2aga@pe1mvx.ampr.org
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Ham-Digital Digest Tue, 20 Jun 2000 Volume 2000 : Issue 171
Today's Topics:
2 meter PSK31 (4 msgs)
Experimental HF RTTY Transmissions (2 msgs)
Forget HF & CW - Think Digital
Hottest and fastest HF mode (6 msgs)
Microprocessor for the Motorola Syntor X radios
N0ZO no longer supports Keyboard inputs!
normal modem for packet
Packet Gateway/BBS Help
Packet Radio (4 msgs)
PSK31 for FD??
questions about digital signals on HF
Send Replies or notes for publication to: <Ham-Digital@UCSD.Edu>
Send subscription requests to: <Ham-Digital-REQUEST@UCSD.Edu>
Problems you can't solve otherwise to brian@ucsd.edu.
Archives of past issues of the Ham-Digital Digest are available
(by FTP only) from ftp.UCSD.Edu in directory "mailarchives/ham-digital".
We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
Loop-Detect: Ham-Digital:2000/171
----------------------------------------------------------------------
Date: Mon, 19 Jun 2000 16:08:18 -0500
From: "Ken P. Eckel Jr." <airboy@juno.com>
Subject: 2 meter PSK31
Yeah, a real "line of sight" path. 2M has been known to travel straight
along the chord line underground to the recieving antenna hundreds of miles
away (NOT).
"Hank Oredson" <horedson@att.net> wrote in message
news:7%f25.3904$Xx5.253326@bgtnsc06-news.ops.worldnet.att.net...
>
> "W6RCecilA" <Cecil.A.Moore@IEEE.org> wrote in message
> news:394955A8.438FA317@IEEE.org...
> > Darren Ream wrote:
> > > Amazingly, on PSK31 we were able to copy 100%!
> >
> > Not amazing at all, considering line of sight VHF transmissions
> > have very little phase shift from external causes.
> > --
> > 73, Cecil, W6RCA http://www.mindspring.com/~w6rca
>
> Unless one is surrounded by large reflectors, e.g. mountains.
>
> The interesting test would be PSK31 on 2M over a 500 - 1000 km path.
> i.e. moderate to long troposcatter paths.
>
> --
>
> ... Hank
>
> http://horedson.home.att.net
>
>
>
>
------------------------------
Date: Mon, 19 Jun 2000 18:05:47 -0500
From: "Steve Sampson" <ssampson@usa-site.net>
Subject: 2 meter PSK31
Airboy??
The concept of troposcatter is very well know. Not so well
known (at 2m anyway) is ducting (hugging the Earth as it
curves). It doesn't go through the Earth. 2m is a great radar
band, and a very popular Russian export.
Even a short time on 2m will get you all sorts of A.P.
(Anomalous Propagation) effects, as you play with it.
You have to get out of the FM repeater slices to enjoy it.
Steve
"Ken P. Eckel Jr." <airboy@juno.com> wrote
> Yeah, a real "line of sight" path. 2M has been known to travel straight
> along the chord line underground to the recieving antenna hundreds of miles
> away (NOT).
>
> "Hank Oredson" wrote
> > "W6RCecilA" wrote
> > > Darren Ream wrote:
> > > > Amazingly, on PSK31 we were able to copy 100%!
> > >
> > > Not amazing at all, considering line of sight VHF transmissions
> > > have very little phase shift from external causes.
> >
> > Unless one is surrounded by large reflectors, e.g. mountains.
> >
> > The interesting test would be PSK31 on 2M over a 500 - 1000 km path.
> > i.e. moderate to long troposcatter paths.
------------------------------
Date: Mon, 19 Jun 2000 23:30:19 GMT
From: "Hank Oredson" <horedson@att.net>
Subject: 2 meter PSK31
"Ken P. Eckel Jr." <airboy@juno.com> wrote in message
news:m%v35.242955$VR.3633372@news5.giganews.com...
> Yeah, a real "line of sight" path. 2M has been known to travel straight
> along the chord line underground to the recieving antenna hundreds of miles
> away (NOT).
Did you have trouble parsing "troposcatter paths" in my posting?
> "Hank Oredson" <horedson@att.net> wrote in message
> news:7%f25.3904$Xx5.253326@bgtnsc06-news.ops.worldnet.att.net...
> >
> > "W6RCecilA" <Cecil.A.Moore@IEEE.org> wrote in message
> > news:394955A8.438FA317@IEEE.org...
> > > Darren Ream wrote:
> > > > Amazingly, on PSK31 we were able to copy 100%!
> > >
> > > Not amazing at all, considering line of sight VHF transmissions
> > > have very little phase shift from external causes.
> > > --
> > > 73, Cecil, W6RCA http://www.mindspring.com/~w6rca
> >
> > Unless one is surrounded by large reflectors, e.g. mountains.
> >
> > The interesting test would be PSK31 on 2M over a 500 - 1000 km path.
> > i.e. moderate to long troposcatter paths.
--
... Hank
http://horedson.home.att.net
------------------------------
Date: Tue, 20 Jun 2000 09:04:13 +0300
From: Paul Keinanen <keinanen@sci.fi>
Subject: 2 meter PSK31
On Mon, 19 Jun 2000 16:08:18 -0500, "Ken P. Eckel Jr."
<airboy@juno.com> wrote:
>Yeah, a real "line of sight" path. 2M has been known to travel straight
>along the chord line underground to the recieving antenna hundreds of miles
>away (NOT).
Have you ever heard of troposcatter ?
We have four hour VHF/UHF/microwave contests on Tuesdays evenings and
looking at the results from the last few months, there are at least
ten stations in each category with longest QSOs in the 300 - 800 km
range on 2 m and 70 cm, on the microwave bands there are a few
stations in that range, but the number of participants are quite low.
This is definitely troposcatter and not tropospheric bending. The
signal can quite often contain deep QSB, apparently due to multipath
due to multiple scattering paths taking out the signal as in selective
fading. Multipath also means a lot of phase reversals, so I very much
doubt that PSK31 is suitable for troposcatter. It might be better to
try a wide modulation method (with low net data rate) in order to
combat the fading.
Paul OH3LWR
------------------------------
Date: Tue, 20 Jun 2000 01:43:33 GMT
From: haynes@alumni.uark.edu (Jim Haynes)
Subject: Experimental HF RTTY Transmissions
Experimental station WA9XHN, Auburn, WA is from time to time running
RTTY at 60WPM, 170 Hz shift on 13972 or 6994 KHz.
------------------------------
Date: Tue, 20 Jun 2000 07:14:01 -0700
From: "CW" <cmagers@sprynet.com>
Subject: Experimental HF RTTY Transmissions
To bad I don't have RTTY receiving equipment. I could get you by ground
wave. I'm in Algona.
--
CW
KC7NOD
Jim Haynes <haynes@alumni.uark.edu> wrote in message
news:9%z35.18339$FC6.380448@newsread1.prod.itd.earthlink.net...
> Experimental station WA9XHN, Auburn, WA is from time to time running
> RTTY at 60WPM, 170 Hz shift on 13972 or 6994 KHz.
>
------------------------------
Date: Mon, 19 Jun 2000 23:46:13 -0700
From: "Stewart R Teaze" <HORSESHOE7@prodigy.net>
Subject: Forget HF & CW - Think Digital
Phoey on the ARRL and TAPR, it is time to start making our own hi-speed
To be continued in digest: hd_2000_171B
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