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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks for the alert.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Will surely keep that in mind. I ran into similar threading issue w my “shack to go” project when working w/ the barrels.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> aprssig [mailto:aprssig-bounces@tapr.org]
<b>On Behalf Of </b>Andrew P. via aprssig<br>
<b>Sent:</b> Saturday, September 12, 2015 3:29 PM<br>
<b>To:</b> TAPR APRS Mailing List <aprssig@tapr.org><br>
<b>Subject:</b> Re: [aprssig] OT:: Jeep and Radio<o:p></o:p></span></p>
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<p class="MsoNormal">Watch out for those PL259 feedthroughs. The threads are very fine and the nuts don't spread out very far. I tried this with a mirror-arm mount bracket on my motor home, and it didn't take very many whacks of the antenna against low-hanging
tree branches to totally strip the threads on the nuts and barrel connector. Worse yet, I was using an NMO-to-SO239 barrel, which is more expensive than a plain SO239-to-SO239 barrel (though the NMO base was bigger than the nut on the other side). Wish they
made the barrels with bigger threads and wider nuts that wouldn't torque off so easily.
<o:p></o:p></p>
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<p class="MsoNormal">Andrew, KA2DDO <o:p></o:p></p>
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<p class="MsoNormal">also known as "Mooserider"<o:p></o:p></p>
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<br>
-------- Original message --------<br>
From: "Stephen H. Smith via aprssig" <<a href="mailto:aprssig@tapr.org">aprssig@tapr.org</a>>
<br>
Date: 09/12/2015 12:48 PM (GMT-08:00) <br>
To: Nagi Punyamurthula <<a href="mailto:n0agi@n0agi.com">n0agi@n0agi.com</a>>, TAPR APRS Mailing List <<a href="mailto:aprssig@tapr.org">aprssig@tapr.org</a>>
<br>
Subject: Re: [aprssig] OT:: Jeep and Radio <o:p></o:p></p>
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<p class="MsoNormal">On 9/12/2015 11:32 AM, Nagi Punyamurthula via aprssig wrote:<br>
> Team<br>
> I had recently acquired a Jeep and exploring installing my Kenwood d710g in<br>
> it. Mstly for APRS and voice repeaters on 2m/70cm<br>
><br>
> Wanted to see if folks here have any jeep install pictures you might be able to<br>
> share for ideas.<br>
><br>
> The bracket I'm zoning in on is at extremeterrain website<br>
> <a href="http://www.extremeterrain.com/rugged-ridge-cb-antenna-jk-1150389.html">
http://www.extremeterrain.com/rugged-ridge-cb-antenna-jk-1150389.html</a><br>
><br>
> While this is meant for CB, I think it can be made to work for 259s<br>
><br>
<br>
Most CB antennas use HF-antenna-style 3/8"-24 threaded studs for mounting; not <br>
PL-259- or NMO-style mounts like most VHF/UHF antennas.<br>
<br>
It would appear (judging from the not-very-clear pictures on the site you <br>
linked) that this bracket is intended for a fitting that has a 3/8-24 <br>
inside-threaded "hole" to accept the male-studded whip on one end, and a 3/16" <br>
or 1/" inch hole to accept a matching short screw and ring terminal (from the <br>
coax center conductor) on the other. The entire fitting is "RF hot". It is <br>
mounted through the hole in the bracket with sandwiched nylon shoulder washers <br>
to keep it from touching the vehicle body/ground.<br>
<br>
To use it with VHF/UHF antennas, you would have to acquire a 2M/70CM antenna <br>
with a PC-259 base (not the more common NMO). Then you would have insert a <br>
PL-259 female-to-female "barrel plug" (i.e. coax-to-coax "splicer") through the <br>
hole in the bracket. You would screw the antenna to the top end of the barrel <br>
plug and a coax line with a PL-259 plug to the bottom end. Make sure your <br>
barrel plug comes with a pair of hex nuts around it's outer circumference -- <br>
not all do.<br>
<br>
However, since a barrel plug has a 5/8" outside diameter while the normal hole <br>
for a shoulder-washer insulator mount is only 1/2", you would have to drill or <br>
ream the hole in the bracket to enlarge it.<br>
<br>
Even after all this, you will get a lousy lop-sided radiation pattern since <br>
about half of the VHF/UHF whip's height will be blocked by the vehicle body, <br>
and the spare tire. In the forward and backwards directions, you will have far <br>
less radiation than off the sides or backwards. (The much taller CB whip <br>
has most of it's length above the roof.) Signals from the sides that were <br>
usable initially will take a 10-15 dB dive when you make a right-angle turn, so <br>
that the front or rear of the vehicle are now facing them.<br>
<br>
To get a reasonably circular antenna pattern (i.e. same coverage in all <br>
directions), the vast majority of the antennas's length MUST be ABOVE the roof <br>
line.<br>
<br>
The best location will be a permanent or magnetic mount in the center of the <br>
roof. If the roof is non-metallic (i.e. fiberglas), you will need to use a <br>
no-ground-plane-required end-fed half-wave design like the Diamond 770 <br>
series. (The much more common 1/4-wave or 5/8ths-wave-type antennas MUST <br>
have a substantial horizontal metallic surface underneath them to work properly.)<br>
<br>
_________________________________________________<br>
<br>
--<br>
<br>
Stephen H. Smith wa8lmf (at) aol.com<br>
Skype: WA8LMF<br>
EchoLink: Node # 14400 [Think bottom of the 2-meter band]<br>
Home Page: <a href="http://wa8lmf.net">http://wa8lmf.net</a><br>
<br>
***** Windows 10 Outrages! *****<br>
<<a href="http://WA8LMF.net/Windows10_Info">http://WA8LMF.net/Windows10_Info</a>><br>
<br>
Live Off-The-Air APRS Activity Maps<br>
<<a href="http://wa8lmf.net/map">http://wa8lmf.net/map</a>><br>
<br>
Long-Range APRS on 30 Meters HF<br>
<<a href="http://wa8lmf.net/aprs/HF_APRS_Notes.htm">http://wa8lmf.net/aprs/HF_APRS_Notes.htm</a>><br>
<br>
<br>
_______________________________________________<br>
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<a href="http://www.tapr.org/mailman/listinfo/aprssig">http://www.tapr.org/mailman/listinfo/aprssig</a><o:p></o:p></p>
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