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PA2AGA > HDDIG 18.06.00 04:37l 210 Lines 7368 Bytes #-9440 (0) @ EU
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Ham-Digital Digest Fri, 16 Jun 2000 Volume 2000 : Issue 167
Today's Topics:
2 meter PSK31 (3 msgs)
APRS Digipeater for DOS? (2 msgs)
FT-980 software
help
Hottest and fastest HF mode (8 msgs)
Packet Radio (19 msgs)
Pager Programming Pins
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Loop-Detect: Ham-Digital:2000/167
----------------------------------------------------------------------
Date: Thu, 15 Jun 2000 16:09:24 -0500
From: Darren Ream <reamesq@swbell.net>
Subject: 2 meter PSK31
Back for a report. Today, I finally hooked up with another station on 2m
PSK31 and conducted some tests to see how psk compared to psk. Howard,
WD5DJT, and I are only about 50 miles from each other, so we had to "simulate"
weak signal conditions by both of us turning our beams 90 degrees from one
another and turning down transmit power to 2 watts. Under these conditions,
on SSB we could not hear each other at all (I could barely hear Howard but not
make out anything he was saying). Then, leaving the beams and power set up as
they were on SSB, we attempted to make contact on PSK31. Amazingly, on PSK31
we were able to copy 100%! Signal strengths were obviously much less, but not
enough to affect copy on PSK31! So, after our brief less-than-scientific
experiment, I can say that PSK31 is vastly superior to SSB under normal VHF
weak-signal conditions. Another observation: on 2 meters, frequency
stability of your transceiver matters much more than on HF. Howard and I were
actually able to observe (using Digipan) our transmit frequencies drift up and
down 10-20 Hz. A less than stable rig goes unnoticed on 20 meters, but not on
2 meters.
PSK is clearly superior to SSB for VHF weak signal communications, it appears,
and there just needs to be more operators so we can all experiment and make
observations (as well as contact new grids!).
If anyone else has any thoughts on VHF PSK31, please post them.
-Darren Ream
W5DKE
Steve Sampson wrote:
> What would you use? Horizontal and 144.2 (calling freq)?
> Curious, as I have a very old Yaesu 2m SSB that might make
> an interesting PSK31 rig. Alas, I don't have a beam any more.
>
> Steve/k5okc EM15
>
> "Darren Ream" <reamesq@swbell.net> wrote
> > It seems to me that PSK31 mode would work very well for 2 meter
> > weak-signal contacts. I have called CQ a few times on 2 meters but have
> > not been able to raise anyone. Has anyone tried PSK on 2 meters? If
> > so, do you have any observations regarding its usefulness for
> > weak-signal contacts particularly how it compares to ssb?
> > Any comments would be much appreciated.
> > Also, if anyone would like to set up a sked with me for two meters,
> > e-mail me at:
> > reamesq@swbell.net
> > Thanks,
> > Darren Ream
> > W5DKE, grid: EM12
------------------------------
Date: Thu, 15 Jun 2000 17:16:08 -0500
From: W6RCecilA <Cecil.A.Moore@IEEE.org>
Subject: 2 meter PSK31
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
------------------------------
Date: Fri, 16 Jun 2000 02:09:07 GMT
From: "Hank Oredson" <horedson@att.net>
Subject: 2 meter PSK31
"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: Thu, 15 Jun 2000 07:03:52 +0100
From: Ian Wade <Ian.Wade@care4free.net>
Subject: APRS Digipeater for DOS?
In article <39480831.6C63EFF2@cyberhighway.net>, Tate
<73KC7ZRU73@cyberhighway.net> writes
>There are sure several to look at. Nice part is they're usually small
>downloads. Best bet would be to DL a few and try them out for a bit.
>
>Locally, one of our guys uses APRSDigi
>http://www.qsl.net/n4uyq/aprsdigi.htm
>
APRSdigi works very well, is simple to set up, and needs minimal
hardware -- I run it on a 15-year old 20MHz 286 with 1MB RAM and a
14-year old PK88. The distribution includes the source -- this is in
BASIC, so you can twiddle it to suit your own requirements.
73
Ian, G3NRW
Technical Editor, APRS Protocol Specification
********* Third draft now available *********
--
+------------------------------------------------------------------+
| APRS on 144.800 [IO91SX] ~55km/35 miles NNW of London |
| email: g3nrw@arrl.net |
| |
| APRS PROTOCOL SPEC: http://www.tapr.org/tapr/html/Faprswg.html |
| APRS DECODER: http://www.netro.co.uk/aprs.htm |
+------------------------------------------------------------------+
------------------------------
Date: Thu, 15 Jun 2000 19:43:49 -0400
From: "Rob" <Pse@NoEmail.Com>
Subject: APRS Digipeater for DOS?
What about using a KANTRONICS TNC such as the KPC-3 with version 8.2
firmware??
Doesn't the KPC-3 have a UI-DIGI repeater function built into its version
8.2 firmware??
73's
Rob
"Tate" <73KC7ZRU73@cyberhighway.net> wrote in message
news:39480831.6C63EFF2@cyberhighway.net...
> There are sure several to look at. Nice part is they're usually small
> downloads. Best bet would be to DL a few and try them out for a bit.
>
> Locally, one of our guys uses APRSDigi
> http://www.qsl.net/n4uyq/aprsdigi.htm
>
> There's also DIGI_NED
> http://www.homepages.hetnet.nl/~remko/
>
> Stealth Digi
> http://www.theworks.com/~wa6ylb/ (look near bottom of the page)
>
> If you have a ROM burner - skip the PC altogether and make any TNC2 an
APRS
> DIGI with
> http://gw.ir3ip.ampr.org/~iw3fqg/uidigi.htm
>
> Hope that helps. Only comments I can offer, local guy started with Stealth
Digi
> - but switched to APRSDigi. Said it was easier to setup and run.
>
> Good luck!
>
> 73
>
> jjodon@my-deja.com wrote:
> >
> > I have and old 386 computer that I am thinking about putting in our
> > repeater hut as a APRS digipeater. What APRS digipeater software would
To be continued in digest: hd_2000_167B
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