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PA2AGA > HDDIG 28.09.99 02:32l 230 Lines 7140 Bytes #-9755 (0) @ EU
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Subject: HamDigitalDigest 99/243H
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>.
------------------------------
Date: Sun, 26 Sep 1999 20:00:48 -0700
From: "Hank Oredson" <horedson@att.net>
Subject: Let's look at real numbers for TNC software sales
Gary Coffman <ke4zv@bellsouth.net> wrote in message
news:=kzuN6vX=XrAbnM6926xUpDZCpZZ@4ax.com...
> >Gary, you not paying attention.
> >More ERP equals more power spread equals longer path.
>
> And more power *spread* is exactly what you want to avoid. That
> causes more multipath reflections from more objects further from
> the line of sight path. *You* aren't paying attention. The *last* thing
> you want to do is spew excessive signal around the countryside.
>
> What you need to do is tightly focus your signal along a well
> engineered line of sight path, and keep the power spreading down
> to the *absolute minimum possible* to avoid generating excessive
> ISD. For properly engineered line of sight paths, low transmitter
> power is always sufficient. For poorly engineered paths, excessive
> power generally won't help because the ISD, and BER, becomes
> unacceptable.
Gary, that is exactly what I said.
"power spread":. the difference between transmit and receive
power levels at the radio. ERP minus noise floor. Both in dbm.
Increased by adding aluminium and/or silicon (or GAAS if your
noise floor is receiver limited not environment limited.)
A measure of the capability of the radio/feedline/antenna system.
The thing you are talking about is "beam width".
That helps to avoid problems from off-path reflectors.
Does not help with on-path reflectors of course.
Refractors and phase shifters have the same properties.
"... well engineered .." makes no sense. The paths are what they are.
They go, for example, from my house to your house.
This is the long haul case we are talking about. You don't *normally*
put large dishes or large yagi arrays anywhere except on your own
property. Way too hard to maintain if they are not local. Exceptions
exist of course, but I've never personally encountered one.
For the long haul case, it is rare that the path is line of sight.
Usually it is a scatter path of some nature.
Example: the troposcatter path from the Lowell, MA area to
Southern NJ on 2M 1200 baud. Worked quite well for us when
we used it. KW and 4 long yagis in NJ, 200W and two long yagis
in MA. Antennas at 170 and 120 feet above local terrain.
This discussion has nothing to do with the high speed network
discussion. I play with more than one thing in ham radio.
--
... Hank
http://horedson.home.att.net
|
>.
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Date: Sun, 26 Sep 1999 20:08:41 -0700
From: "Hank Oredson" <horedson@att.net>
Subject: Let's look at real numbers for TNC software sales
Gary Coffman <ke4zv@bellsouth.net> wrote in message
news:qITuN3bo4KIVXiYr8IRYBXGdZBAR@4ax.com...
> Show us the header of a message that I have forwarded to or from a packet
> BBS by telephone. You cannot because I have never done so. Nor have I
> knowingly sent messages which have been so relayed at some distant point
> beyond my control. Never once.
I asked the question earlier in this thread, and will ask it again:
Gary, can you send me a message via the ham radio BBS network?
I have *never* gotten a message from you there, nor seen any
bulletin you might have posted.
Give it your best shot.
If I receive one, I'll post it here, complete with headers.
Or did you mean "I am not invovled in the ham radio network
so of course you have never seen one."? If that is the case,
then your pronouncements about that network have very
little credibility.
--
... Hank
http://horedson.home.att.net
|
>.
------------------------------
Date: 26 Sep 1999 13:43:35 GMT
From: Hamish Moffatt <hamish@rising.com.au>
Subject: Packet modems
Shawn Upton <supton@eece.maine.edu> wrote:
> Ok, so I can use a modem if I have the software, or a dedicated TNC for
> packet. What would be the lowest cost way of getting into packet then?
> I would like to eventually get into packet operation, but I fear that
> that won't happen until I'm a bit richer--either I pay $120~150 for the
> TNC (and use freebie software) or pay something similar for software
> that will already use my modem. (At least I suspect it would be similar
> priced.)
The cheapest way (imho) is linux with the soundmodem driver.
It does DSP in software and uses the sound card to produce and decode
the tones (one of the options Laura mentioned). Linux is completely
free of course. The soundmodem works really well. I use it for packet
and an APRS gateway here.
Hamish vk3sb
--
Hamish Moffatt Mobile: +61 412 011 176 hamish@rising.com.au
Rising Software Australia Pty. Ltd. http://www.risingsoftware.com/
Phone: +61 3 9894 4788 Fax: +61 3 9894 3362 USA: 1 888 667 7839
>.
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Date: Mon, 27 Sep 1999 01:07:05 -0000
From: bshort@speedchoice.com (Brian Short)
Subject: QEX.Net Web Pages Moved
QEX.Net Web Pages Moved
Recently, I upgraded to the Speedchoice 2-way wireless
high-speed internet service.
A couple days later I was disconnected because I was
running a web server.
Obviously, I was not happy. Anyway, I am again using
Speedchoice 2-way, but I cannot run the server from home.
If you are a user of my web site (it is moderately popular
for Yaesu boatanchors and for misc mods evidently) you
can access it at http://www.qsl.net/k7on/ (thanks Al).
I am still adjusting some of the links etc and other changes
to go from M$ IIS to Apache, but maybe you can find what
you need.
I cannot presently get Cox Cable or US West Megabit (DSL),
so I'm stuck, but as soon as I can, I will again have a "personal"
server online.
For email to me, I suggest k7on@arrl.net or k7on@qsl.net in
the longer term.
73, Brian
>.
------------------------------
Date: 26 Sep 1999 22:39:16 GMT
From: fireham@aol.com (FIREHAM)
Subject: Radio Computer & Electronics Show (NEWPORT)
The Radio Computer & Electronics Show takes place at the NEWPORT CENTRE
Newport
Sth Wales on 17th October 1999
for more info contact FIREHAM@aol.com.
or see entries in radio mags.
see you all there FIREHAM
>.
------------------------------
Date: Sun, 26 Sep 1999 15:20:58 GMT
From: aa6qn <aa6qn@amsat.org>
Subject: Win 3.1 host mode application for MFJ-1278 ?
Does anyone know of a host mode application that will run on
windows 3.1 that supports the dual tnc MFJ-1278 ? I am trying
to help a fellow ham and have done much on the user side of the house.
Thank you in advance, 73, John
>.
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End of Ham-Digital Digest V99 #243
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