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PA2AGA > HDDIG 28.07.00 11:44l 187 Lines 6869 Bytes #-9299 (0) @ EU
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Date: Fri, 28 Jul 00 08:02:01 MET
Message-Id: <hd_2000_202A>
From: pa2aga@pe1mvx.ampr.org
To: hd_broadcast@pa2aga.ampr.org
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Ham-Digital Digest Thu, 27 Jul 2000 Volume 2000 : Issue 202
Today's Topics:
16 tons, was Re: 56Kb Packet Radio Modem
56Kb Packet Radio Modem (4 msgs)
Forget HF & CW - Think Digital
FS PCB-88 Packet Board
NEW PSK31 PROGRAM (2 msgs)
Q: new SV2AGW site?? (2 msgs)
RigBlaster
Slightly OT, but APRS-related Question (2 msgs)
THD-7A as a TNC (4 msgs)
Send Replies or notes for publication to: <Ham-Digital@UCSD.Edu>
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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:2000/202
----------------------------------------------------------------------
Date: Wed, 26 Jul 2000 18:57:22 -0500
From: "Steve Sampson" <ssampson@usa-site.net>
Subject: 16 tons, was Re: 56Kb Packet Radio Modem
Microsats. Lots of them. One a year. Spread Spectrum (DS).
While the Phase III should be considered an honorable mention, the
fact that it is 16 tons means it will probably never fly. The money
spent hauling this 16 tons all over the world and back down to the
French military base in South America, could have launched at
least *dozens* of these microsats. If phase III flies, it will be about
as potent as stuff we had back in 1990.
Steve/k5okc
"16 tons, what do you get? Another day older, and deeper in debt."
"Hank Oredson" wrote
>
> So how to build the longer haul network links to hook these fast
> metro-area nets together?
------------------------------
Date: Wed, 26 Jul 2000 12:24:18 -0400
From: "Ed Hare, W1RFI" <w1rfi@arrl.net>
Subject: 56Kb Packet Radio Modem
Hank Oredson <horedson@att.net> wrote:
> "Part 15 devices: Very limited short range plug and pray."
Hams can significantly increase the range of Part 15 devices by easily
adding antennas and, with only slightly more difficulty, adding amplifiers.
At up to 1 watt of power, these devices are capable of real communications
over distance. The Part 15 antenna must be "integral" and not exceed 6 dBi.
See CFR 15.247 (http://www.fcc.gov/mmb/asd/bickel/47CFRrule.html). Hams are
not bound by the power limit or antenna gain of Part 15, but can use
unlimited antenna gain and power as defined in Part 97.
Not sure if 1 W and a decent antenna would reliably do 50 kM over most
paths, though. Any good path-loss analysts care to chime in?
73,
Ed Hare, W1RFI
------------------------------
Date: Wed, 26 Jul 2000 17:05:15 GMT
From: horseshoestew@my-deja.com
Subject: 56Kb Packet Radio Modem
In article <%iEf5.151$a83.547576@news.ntplx.net>,
"Ed Hare, W1RFI" <w1rfi@arrl.net> wrote:
> Hank Oredson <horedson@att.net> wrote:
>
> > "Part 15 devices: Very limited short range plug and pray."
>
> Hams can significantly increase the range of Part 15 devices by easily
> adding antennas and, with only slightly more difficulty, adding
amplifiers.
> At up to 1 watt of power, these devices are capable of real
communications
> over distance. The Part 15 antenna must be "integral" and not exceed
6 dBi.
> See CFR 15.247 (http://www.fcc.gov/mmb/asd/bickel/47CFRrule.html).
Hams are
> not bound by the power limit or antenna gain of Part 15, but can use
> unlimited antenna gain and power as defined in Part 97.
Good luck getting Hank to listen, Ed.
I've got a feeling that Hank may live in an area where he would not be
able to make many contacts, even if modified part 15 devices DO catch
on. I've got three places that I stay at in Southern California. For
the short term, my best locale for this work is in an fairly urbanized
area - my parents' house in San Diego. That is why I'm constructing my
tower there. Unfortunately, due to a number of factors, I've had to
scale back my tower plans, and I'm now submitting a building permit for
a 29' tower. To appease my parents, their neighbors, and to stay under
a 30' city-imposed fee level(no fee if under 30' - $90 if over 30'),
I'm only going to be able use 3 sections from the hbx48 I bought.
However, I'm going to build the foundation, and select the lower
section in a way that I could add 16' more some day.
> 73,
> Ed Hare, W1RFI
Stewart - N0MHS
--
Wireless High-Speed Networking Information:
http://www.geocities.com/SiliconValley/Monitor/2254/radio.html
Public Radio Services Information:
http://www.geocities.com/SiliconValley/Monitor/2254/radio2.html
Sent via Deja.com http://www.deja.com/
Before you buy.
------------------------------
Date: Wed, 26 Jul 2000 19:14:08 GMT
From: "Hank Oredson" <horedson@att.net>
Subject: 56Kb Packet Radio Modem
"Ed Hare, W1RFI" <w1rfi@arrl.net> wrote in message
news:%iEf5.151$a83.547576@news.ntplx.net...
> Hank Oredson <horedson@att.net> wrote:
>
> > "Part 15 devices: Very limited short range plug and pray."
>
> Hams can significantly increase the range of Part 15 devices by easily
> adding antennas and, with only slightly more difficulty, adding amplifiers.
> At up to 1 watt of power, these devices are capable of real communications
> over distance. The Part 15 antenna must be "integral" and not exceed 6 dBi.
> See CFR 15.247 (http://www.fcc.gov/mmb/asd/bickel/47CFRrule.html). Hams are
> not bound by the power limit or antenna gain of Part 15, but can use
> unlimited antenna gain and power as defined in Part 97.
>
> Not sure if 1 W and a decent antenna would reliably do 50 kM over most
> paths, though. Any good path-loss analysts care to chime in?
>
> 73,
> Ed Hare, W1RFI
A guess: yes, 50 km is not unreasonable and longer paths
should be possible when done in the ham band with "true optical
line of sight paths" and not-too-large antennae. This means
point to point links, two ends required for each ham station
linked to the network.
Cost of something like this? Less than $1000 per end?
But 50 km is, in my view, "limited short range" ...
For urban or suburban use, in open areas, where the density of hams
is high and the density of obstructions is low, these devices might be
useful. Won't work here though, since the above conditions do not apply.
So how to build the longer haul network links to hook these fast
metro-area nets together?
--
... Hank
http://horedson.home.att.net
To be continued in digest: hd_2000_202B
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