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PA2AGA > HDDIG 05.12.99 18:12l 174 Lines 6609 Bytes #-9660 (0) @ EU
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Date: Sat, 04 Dec 99 23:34:54 MET
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From: pa2aga
To: hd_broadcast@pa2aga
Subject: HamDigitalDigest 99/306D
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>greater than one, or about 6 sidebands of the modulating frequency.
The optimum is an index of 0.5. It is called MSK.
Gary
Gary Coffman KE4ZV | You make it |mail to ke4zv@bellsouth.net
534 Shannon Way | We break it |
Lawrenceville, GA | Guaranteed |
>.
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Date: Mon, 22 Nov 1999 10:44:31 -0500
From: Gary Coffman <ke4zv@bellsouth.net>
Subject: German packet radio
On Wed, 10 Nov 1999 08:50:55 +0200, Paul Keinanen <keinanen@sci.fi> wrote:
>On Tue, 9 Nov 1999 19:38:27 -0600, "Steve Sampson"
><ssampson@usa-site.net> wrote:
>>I would suspect that with a 38400 Hz modulation component, that you would
>>want a real small modulation index to keep it inside 100 kHz bandwidth.
>
>Why should it be kept inside a 100 kHz bandwidth ? Is this limit in
>your amateur radio regulations, if so, what has your national amateur
>radio society done to remove these restrictions ?
Yes, that is the limit on occupied bandwidth for data emissions in the
70 cm band in the US FCC regulations. As to a national amateur radio
society, we don't have one, but the largest amateur radio publisher, the
ARRL, strongly lobbied to keep permitted data bandwidths as narrow
as possible at the time that the limits were set. 100 kHz was all we
could get against their opposition.
The ARRL did several years later belatedly push to get us the 219 MHz
band as partial compensation for losing the lower 2 MHz of the 220 MHz
band (an extremely badly bungled fiasco). It is assigned exclusively as
10 100 kHz coordinated channels for fixed point to point data. Our 56 kb
MSK RF modems were designed to fit that constraint.
33 cm and 23 cm have no bandwidth restrictions, however. We can
run anything that stays inside the band edges. But activity on those
bands is virtually nil in most places. I bought 8 full duplex medium
speed data radio systems (Motorola) at auction a few years ago
hoping to drum up some interest in running data on 33 cm, but no
other amateur in this area expressed any interest in setting up
33 cm links, so the equipment remains sitting in storage.
>If this is a self-imposed bandplan, is there really that much traffic
>on 70 cm or 23 cm that are just outside the intended packet channel ?
70 cm is vastly underutilized in most parts of our country. Sure, there are
closed private repeaters on virtually every channel in some areas, but they
aren't heavily used. They mostly just warehouse spectrum thanks to the
way our regulations give priority on the pair to coordinated repeaters.
(The way our regulations have been interpreted, the holder of a repeater
coordination has defacto ownership of the frequency pair against other
usages, despite the fact that the regulations plainly state that no amateur
station can own a frequency.)
>Voluntary band plans are very usable when deciding where to put some
>new service and also for solving disputes _when_ two or more services
>are wanting use the same frequency band. However, if there is only one
>service and no plans for other services in that area for many years,
>why degrade the performance of the link just to meet some administra-
>tive plans made originally for very different circumstances ?
Voluntary band planning is a good idea, but the ARRL has recently tried
to have such voluntary plans assume the force of law. That's bad since it
tends to lock in the status quo because the coordinating bodies are mainly
made up of repeater owners who don't want to give up their lock on the
spectrum.
But that's really a moot point. With 33 cm and 23 cm virtually vacant here,
there is no shortage of spectrum in which to erect high speed networks.
What is lacking is a will to do so among most US amateurs. (Sadly, if it
doesn't say Yaesu, Icom, or Kenwood on the front panel, it isn't amateur
radio to most US amateurs.) It pains me to see that a TNC and a 2m HT
is still the dominant image of packet radio among US amateurs. That's
where we were 20 years ago when 1200 baud half duplex was fairly hot
stuff. It isn't anymore.
Gary
Gary Coffman KE4ZV | You make it |mail to ke4zv@bellsouth.net
534 Shannon Way | We break it |
Lawrenceville, GA | Guaranteed |
>.
------------------------------
Date: Sat, 27 Nov 1999 05:02:02 -0500
From: "Luther D. Williams" <z3f3q3mh@coastalnet.com>
Subject: HAL PC1-400 CLOVER BOARD
HELLO,
I HAVE A HAL PC1-4000 CLOVER BOARD ( BELOW 600) WITH ALL THE UPDATES
$500.00 EMAIL: Z3F3Q3MH@COASTALNET.COM
THANKS AND 73, LUKE
>.
------------------------------
Date: Sun, 28 Nov 1999 21:39:26 GMT
From: dawino@yahoo.com (mike)
Subject: Help, I need mods for anything and everything PLEASE
HELP!!!!!!!!!!!!!!!!!
help, I need mods for everything, I am putting up a site and have one
section devoted to computer and dx talk. I intend to put up any radio
mods, schematics (home brew only here) antenna designs, scanner mods
and you name it check out the site at www.frontiernet.net/~pfp and
then e-mail those mods please the mods page will always be free you
can find it under computer and dx talk from the page
>.
------------------------------
Date: Sun, 28 Nov 1999 20:03:35 -0600
From: "Steve Sampson" <ssampson@usa-site.net>
Subject: Help, I need mods for anything and everything PLEASE
HELP!!!!!!!!!!!!!!!!!
Just find an old QRZ CD-ROM. It's all on there.
>help, I need mods for everything, I am putting up a site and have one
>section devoted to computer and dx talk. I intend to put up any radio
>mods, schematics (home brew only here) antenna designs, scanner mods
>.
------------------------------
Date: Sun, 28 Nov 1999 16:42:36 -0800
From: Dana Myers K6JQ <DMyers@Qnet.com>
Subject: k6jq- virus?
Perry Chamberlain wrote:
>
> While reading k6jq's posts and recieving his packets and e-mail, I have
> an overwhelming urge to stand naked on the roof wearing only argle
> socks, a tin foil hat and scream unix strings out load at the full moon
> and argue wine tasting tips with my cat.. Is this a virus , has anyone
> else had this problem?
You're totally exaggerating, I do not even own a pair of argyle socks.
> Could this be a more potent version of the satan virus......
To be continued in digest: hd_99_306E
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