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A digipeater consumes the transmission, alters it, and sends it back
out. It is a "Message forwarding system."<br>
as detailed in part 97.219.<br>
<br>
Gregg Wonderly<br>
<br>
On 9/20/2011 8:05 AM, Dr. John wrote:
<blockquote cite="mid:3F3AC09AA75A476A9C450097C8BD87A0@DrJohnPC"
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<div><font face="Calibri">Lynn,</font></div>
<div><font face="Calibri">Repeating is repeating either simples or
duel.</font></div>
<div><font face="Calibri">The FCC, stated clearly states this.</font></div>
<div style="FONT: 10pt Tahoma">
<div><font face="Calibri" size="3">The only unit's that are
repeaters and in mobile mode are as example mini repeaters
in police cars, like the state police used when they enter a
facility and in remote areas.</font></div>
<div>Theses<font face="Calibri" size="3"> units were made by
Midland and some other companies. But they were registered.</font></div>
<div><font face="Calibri" size="3">John W3ATE-8</font></div>
</div>
<div style="FONT: 10pt Tahoma">
<div><br>
</div>
<div style="BACKGROUND: #f5f5f5">
<div style="font-color: black"><b>From:</b> <a
moz-do-not-send="true" title="dnchls@gmail.com"
href="mailto:dnchls@gmail.com">David Nichols</a> </div>
<div><b>Sent:</b> Monday, September 19, 2011 10:32 PM</div>
<div><b>To:</b> <a moz-do-not-send="true"
title="aprssig@tapr.org" href="mailto:aprssig@tapr.org">'TAPR
APRS Mailing List'</a> </div>
<div><b>Subject:</b> Re: [aprssig] Mobile Digipeating</div>
</div>
</div>
<div><br>
</div>
<div class="WordSection1">
<p class="MsoNormal"><span style="FONT-FAMILY:
'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">All
of this brings up another issue. From the little I’ve been
able to gather about mobile digipeating, and I agree with
the statement below ( I believe temporary re-locatable is a
better term), it is for temporary emergency use. If this is
correct, what constitutes “emergency”. Could I justify using
it as described for practice purposes? I practice, on the
average, twice a week, for 1-2 hours. I would hate for my
next posting to you folks to be from Leavenworth after my
first digipeating session </span><span style="FONT-FAMILY:
Wingdings; COLOR: #1f497d; FONT-SIZE: 11pt">J</span><span
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d;
FONT-SIZE: 11pt">. Or for that matter, would I be getting
nasty-grams from the APRS community? Otherwise, I think this
might fit my needs. I could also use it on actual searches,
especially if I drive a ways from Incident Base to the
subject’s place last seen, which has been the case several
times.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:
'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:
'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">dave<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-FAMILY:
'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">N5FMA<o:p></o:p></span></p>
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PADDING-TOP: 3pt">
<p class="MsoNormal"><b><span style="FONT-FAMILY:
'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</span></b><span
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE:
10pt"> <a class="moz-txt-link-abbreviated" href="mailto:aprssig-bounces@tapr.org">aprssig-bounces@tapr.org</a>
[<a class="moz-txt-link-freetext" href="mailto:aprssig-bounces@tapr.org">mailto:aprssig-bounces@tapr.org</a>] <b>On Behalf Of </b>Jim
Alles<br>
<b>Sent:</b> Saturday, September 17, 2011 9:52 AM<br>
<b>To:</b> TAPR APRS Mailing List<br>
<b>Subject:</b> Re: [aprssig] Mobile Digipeating<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Besides, we really aren't talking about
mobile digipeating. That is not recommended for APRS,
either. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">I would call it a re-locatable
digipeater, others might use the term portable. It is
temporary, fixed use.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Peace,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Jim A. KB3TBX<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">On Sat, Sep 17, 2011 at 8:53 AM, Lynn W.
Deffenbaugh (Mr) <<a moz-do-not-send="true"
href="mailto:ldeffenb@homeside.to">ldeffenb@homeside.to</a>>
wrote:<o:p></o:p></p>
<p class="MsoNormal">A digipeater is not a dual-frequency
repeater, but a receive and re-transmit on a single
frequency. There is no pre-registration required in the
United States that I'm aware of.<br>
<br>
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile
and Win32 <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"><br>
<br>
On 9/17/2011 8:32 AM, Dr. John wrote:<o:p></o:p></p>
<p style="MARGIN-BOTTOM: 12pt" class="MsoNormal">Mobile
repeaters in the amateur environment is not authorized.
As repeaters need to be registered at a fixed position<br>
<br>
Dr. John Gregory /W3ATE-8<br>
<br>
--------------------------------------------------<br>
From: "Tom Russo" <<a moz-do-not-send="true"
href="mailto:russo@bogodyn.org" target="_blank">russo@bogodyn.org</a>><br>
Sent: Saturday, September 17, 2011 1:02 AM<br>
To: "TAPR APRS Mailing List" <<a
moz-do-not-send="true" href="mailto:aprssig@tapr.org"
target="_blank">aprssig@tapr.org</a>><br>
Subject: Re: [aprssig] Mobile Digipeating<o:p></o:p></p>
<p class="MsoNormal">On Fri, Sep 16, 2011 at 10:34:30PM
-0600, we recorded a bogon-computron collision of the
<<a moz-do-not-send="true"
href="mailto:dnchls@gmail.com" target="_blank">dnchls@gmail.com</a>>
flavor, containing:<o:p></o:p></p>
<p class="MsoNormal">I am in search and rescue and use
APRS so others can keep track of me.<o:p></o:p></p>
<p style="MARGIN-BOTTOM: 12pt" class="MsoNormal"><br>
You're in good company.<o:p></o:p></p>
<p class="MsoNormal">I<br>
live in New Mexico where we have many digipeaters on
mountain tops, but we<br>
still have many dead zones.<o:p></o:p></p>
<p style="MARGIN-BOTTOM: 12pt" class="MsoNormal"><br>
I've been watching your tracks. I'm not sure the dead
zones are as dead as<br>
all that. Still, there are some notable places where
there are searches and<br>
that have spots where you can't be heard.<o:p></o:p></p>
<p class="MsoNormal">I have a YAESU VX-8DR ht that I carry
with me<br>
both when practicing and on actual searches. I am
considering buying a<br>
Kenwood TM-D710A. I would like to use the 710 in my
mobile as a digipeater<br>
to either get back to search base on a search or to a
mountain digi when I'm<br>
practicing so my family can know where I'm at on
APRS.fi. I would typically<br>
be within a couple of miles from my truck when I
transmitted an APRS signal<br>
from my ht. How much power does the 710 transmit when in
digipeater mode?<o:p></o:p></p>
<p style="MARGIN-BOTTOM: 12pt" class="MsoNormal"><br>
It transmits with the same power that you have set for
its own APRS<br>
transmissions.<o:p></o:p></p>
<p class="MsoNormal">Would this be a situation where using
a mobile would be useful? Presently,<br>
it just doesn't seem I have the punch I need when using
the ht.<o:p></o:p></p>
<p style="MARGIN-BOTTOM: 12pt" class="MsoNormal"><br>
It would help if your truck is generally within range of
your handheld, the<br>
truck is in a good place where it is getting digipeated,
and you don't have<br>
terrain in between you and the truck that prevents the
truck from hearing you.<br>
<br>
In this case you could use your truck's callsign as the
first hop in your<br>
digi path, and WIDE2-2 next in the path. That'd let
your truck beacon you<br>
with more ooomph.<br>
<br>
The downside of this is that if you wind up in a spot
where your truck's<br>
radio can't hear you, you won't get anywhere even if a
WIDE can hear you,<br>
because they won't premptively digipeat before your
truck.<br>
<br>
It's unfortunate that Yaesu chose not to implement
"Proportional Pathing" in the<br>
VX-8*R series radios. The VX-8R lets you set 8 paths,
but rather than<br>
cycling through them, it simply concatenates them for
every transmission. I'm<br>
unfamiliar with the VX-8DR, maybe it does have
proportional pathing. With<br>
proportional pathing, you can set multiple digi paths,
but rather than using<br>
them all at once, it cycles through them for each
transmission. Then you<br>
could have "TRUCK,WIDE2-2" for every third transmission,<br>
"WIDE1-1,WIDE2-2" for every third transmission, and
"WIDE2-2" for every third.<br>
That would take care of making sure that at least SOME
of your packets get<br>
to a wide digi --- either directly, or through your
truck, or through a fill-in.<o:p></o:p></p>
<p class="MsoNormal">Unfortunately, the people I know both
in SAR and amateur radio have never<br>
played with mobile digipeaters and are pretty clueless
on the matter.<o:p></o:p></p>
<p class="MsoNormal"><br>
Clueless? I don't think that's a fair statement.<br>
<br>
To date, most SAR activities in the state have managed
without pressing need<br>
for mobile digis. NM SAR Support's comms trailer does
have a TNC programmed<br>
to digi WIDE1-1, so if your path is WIDE1-1, WIDE2-2
(which is OK in NM for<br>
low-powered stations and ONLY low-powered stations...
there was a big<br>
discussion on that subject recently, and you should
check the archives<br>
about it, I won't open that can of worms again), then
the comms trailer in<br>
base will serve as a fill-in digi if needed. We also
have a portable digi we<br>
can place in the search area when necessary. It is
rarely necessary, but it<br>
does get deployed now and then.<br>
<br>
You should also set your D710 to do TEMPn-N digipeating,
but I'm sure<br>
Bob B. will pipe in here quickly about that one. Right
now, very few people<br>
in the SAR community have their radios set up for it, so
counting on the<br>
availability of TEMPn-N on searches is not a safe bet
just yet. But if you<br>
set your own truck to do TEMPn-N, then when you know you
aren't reaching<br>
a wide with your handheld on a search, and you know you
can hear your truck,<br>
you can tinker with your path to use TEMPn-N for a while
to be sure of getting<br>
out. You'd use "TEMP1-1,WIDE2-2" in that case, and as
long as your truck<br>
can hear you you're good.<br>
<br>
One thing you should NOT do is set your truck to
digipeat WIDEn-N as if it<br>
were permanent infrastructure. Some folks in NMSAR did
do that for a while<br>
and it was a terrible mistake --- it meant that ALL
traffic heard by the<br>
incident comms trailer was getting digipeated if it had
any wide hops left.<br>
That meant the APRS radio in the trailer was
transmitting all the time, and<br>
desensing lots of nearby voice radios every few seconds.<br>
<br>
-- <br>
Tom Russo KM5VY SAR502 DM64ux <a
moz-do-not-send="true"
href="http://www.swcp.com/%7Erusso/" target="_blank">http://www.swcp.com/~russo/</a><br>
Tijeras, NM QRPL#1592 K2#398 SOC#236 <a
moz-do-not-send="true"
href="http://kevan.org/brain.cgi?DDTNM"
target="_blank">http://kevan.org/brain.cgi?DDTNM</a><br>
"One man alone can be pretty dumb sometimes, but for
real bona fide<br>
stupidity, there ain't nothin' can beat teamwork." -
Edward Abbey<br>
<br>
<br>
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