<div>Besides, we really aren't talking about mobile digipeating. That is not recommended for APRS, either. </div>
<div> </div>
<div>I would call it a re-locatable digipeater, others might use the term portable. It is temporary, fixed use.<br></div>
<div>Peace,</div>
<div> </div>
<div>Jim A. KB3TBX<br></div>
<div class="gmail_quote">On Sat, Sep 17, 2011 at 8:53 AM, Lynn W. Deffenbaugh (Mr) <span dir="ltr"><<a href="mailto:ldeffenb@homeside.to">ldeffenb@homeside.to</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">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
<div>
<div></div>
<div class="h5"><br><br>On 9/17/2011 8:32 AM, Dr. John wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">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>------------------------------<u></u>--------------------<br>From: "Tom Russo" <<a 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 href="mailto:aprssig@tapr.org" target="_blank">aprssig@tapr.org</a>><br>Subject: Re: [aprssig] Mobile Digipeating<br><br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">On Fri, Sep 16, 2011 at 10:34:30PM -0600, we recorded a bogon-computron collision of the <<a href="mailto:dnchls@gmail.com" target="_blank">dnchls@gmail.com</a>> flavor, containing:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">I am in search and rescue and use APRS so others can keep track of me.<br></blockquote><br>You're in good company.<br>
<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">I<br>live in New Mexico where we have many digipeaters on mountain tops, but we<br>still have many dead zones.<br>
</blockquote><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.<br>
<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">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?<br></blockquote><br>It transmits with the same power that you have set for its own APRS<br>
transmissions.<br><br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">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.<br>
</blockquote><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.<br>
<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">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.<br>
</blockquote><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 href="http://www.swcp.com/~russo/" target="_blank">http://www.swcp.com/~russo/</a><br>
Tijeras, NM QRPL#1592 K2#398 SOC#236 <a href="http://kevan.org/brain.cgi?DDTNM" target="_blank">http://kevan.org/brain.cgi?<u></u>DDTNM</a><br>"One man alone can be pretty dumb sometimes, but for real bona fide<br>
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</div></div></blockquote></div><br>