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PA2AGA > HDDIG 07.10.99 22:43l 195 Lines 6973 Bytes #-9727 (0) @ EU
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Subject: HamDigitalDigest 99/251B
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Rising Software Australia Pty. Ltd. http://www.risingsoftware.com/
Phone: +61 3 9894 4788 Fax: +61 3 9894 3362 USA: 1 888 667 7839
>.
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Date: Tue, 05 Oct 1999 00:06:29 -0600
From: Doc <docky@eafrthlink.net>
Subject: Great Heathkit site
>.
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Date: Mon, 4 Oct 1999 19:38:08 -0400
From: "Nathan Ciufo" <nrciufo@one.net>
Subject: HF RTTY
Greetings, I'm new to HF RTTY, and I was wondering what the most common baud
rate is on the HF bands? Thank you for your help, Nathan KA3MTT
>.
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Date: Tue, 05 Oct 1999 04:55:27 -0400
From: Ralph Mowery <rmowery@dialpoint.net>
Subject: HF RTTY
For the ham bands it is 60 wpm Baudot. That is 45.45 baud rate. W1AW
sends out rtty bulletins several times a day at this speed to start with
if you need a known test signal. They then switch to other modes.
You normally set the receiver to lsb and the shift at 170 hz.
Usually the only other speed is 100 wpm.
>.
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Date: 5 Oct 1999 02:47:31 GMT
From: "Eric S. Johansson" <esj@harvee.billerica.ma.us>
Subject: Japanese packet radio hinted at on TAPR site.
I've been scratching my brain trying to figure out what existing data
radios are available at speeds > 56 K. and so far the only well-known
ones are intellectual if not actual descendants of the grapes system.
from my memory and other sources, there are:
There are theoretically some megabit radios from the country formally
known as Yugoslavia but they've been not well discussed probably
because they've been a little busy for the past few years with some
"domestic" issues.
also within the past few months, someone has posted on this newsgroup
experiments with gunnplexors and ethernet cards running high-speed
microwave links. It seemed not terribly well documented and not
terribly reproducible.
Then I remembered a note I saw on the TAPR WebSite. At the Web page
documenting the TAPR digital forum at Dayton in 1999, there is a
picture of a Japanese fellow shown off a cast metal box in the caption
says: "Hiro shows off the new PRUG 2.4G Wireless Radio which is housed
inside a cable line enclosure. Very cool. He reported that some 12
sets were in use currently in PRUG during their tests."
I found a Web page (http://www.prug.or.jp) which documents the project
in Japanese. there wasn't enough English to evaluate the viability of
the technology.
somewhere, I have an email about building modems using off-the-shelf
(Gaussian?) bpsk(?) modem chips and I can't remember much more than
that. (Yes I'm searching but I literally have MB of email archived.)
fails to have another emailed were someone suggested using video chips
(RAM DACs?) as a low-cost component in spread spectrum radio's. I
think it may have been Gary C. that told me this but again I'm not
positive.
so, between the RF capabilities of cellular phones (which currently go
as high as 1.9 GHz), linux, and ideas from these projects mentioned
above, is there enough information out there to build reasonably
performing full duplex radio links that are reproducible by amateurs
or easily build by the likes of MFJ for the amateur community?
Thoughts?
--- eric
--
Eric S. Johansson ka1eec esj@harvee.billerica.ma.us
This message was composed almost entirely using NaturallySpeaking
>.
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Date: 4 Oct 1999 15:26:21 GMT
From: Hamish Moffatt <hamish@rising.com.au>
Subject: Let's look at real numbers for TNC software sales
Hank Oredson <horedson@att.net> wrote:
> Gary Coffman <ke4zv@bellsouth.net> wrote in message
> news:Xw34NxHJf+EF064afvXkDcnPO0tB@4ax.com...
>> Ah, we appear to have a terminology problem. What you're
>> describing is called * link margin*. Power spreading is dispersion
>> of the signal over a wide area, generally an undesirable condition
>> unless you're intent on broadcasting rather than linking.
> Read it again. "... at THE radio ...".
> "Link Margin" has to do with two stations, the path between them,
> the desired S/N, the effects due to propagation, component drift, etc.
Hank, it is most comical to read you argue this with Gary -- he most
obviously knows what he is talking about. Are you actually having
a real disagreement here?
cheers
Hamish
--
Hamish Moffatt Mobile: +61 412 011 176 hamish@rising.com.au
Rising Software Australia Pty. Ltd. http://www.risingsoftware.com/
Phone: +61 3 9894 4788 Fax: +61 3 9894 3362 USA: 1 888 667 7839
>.
------------------------------
Date: Mon, 4 Oct 1999 10:02:07 -0700
From: "Hank Oredson" <horedson@att.net>
Subject: Let's look at real numbers for TNC software sales
Hamish Moffatt <hamish@rising.com.au> wrote in message
news:7tagut$rg4$2@arachne.labyrinth.net.au...
> Hank Oredson <horedson@att.net> wrote:
> > Gary Coffman <ke4zv@bellsouth.net> wrote in message
> > news:Xw34NxHJf+EF064afvXkDcnPO0tB@4ax.com...
>
> >> Ah, we appear to have a terminology problem. What you're
> >> describing is called * link margin*. Power spreading is dispersion
> >> of the signal over a wide area, generally an undesirable condition
> >> unless you're intent on broadcasting rather than linking.
>
> > Read it again. "... at THE radio ...".
> > "Link Margin" has to do with two stations, the path between them,
> > the desired S/N, the effects due to propagation, component drift, etc.
>
> Hank, it is most comical to read you argue this with Gary -- he most
> obviously knows what he is talking about. Are you actually having
> a real disagreement here?
A real disagreement.
Gary has oversimplified the issues to the point there is almost nothing
to discuss. Let me explain in a bit more detail.
I'll talk about ham radio links, not commercial links.
Some terms that I will use are:
"Station" - The Radio, Feedline and Antenna used at a site. "Radio"
means the transmitter and the receiver. "Antenna" means the receiving
and transmitting antennas if two are used or the single antenna if only
one is used. "Feedline" means the means of connecting the Receiver and
Transmitter to their antenna or antennas.
"Link" - Two Stations that provide a single hop in the network.
I'll call them "A" and "B".
"Link Margin" - The amount of signal that must be provided by one Station
at the other Station to obtain the desired link performance. For each link
there are two "Link Margin" numbers. One for the signals from Station A
as received at Station B, and another for the signals from Stations B as
received at Station A.
To be continued in digest: hd_99_251C
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