[TowerTalk] Connectors for 75 ohm hardline
Mike Lamb
n7ml@imt.net
Mon, 16 Nov 1998 02:18:59 +0000
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Hello Pat:
I have been using this exact method for about 25 years now. I have learned a
few things in the process:
* DO NOT use penetrox because with time it will migrate and cause a blow
out (always in the middle of a European run in a contest)
* DO use silicone grease between the aluminum shield and the barrel
connector to keep corrosion down.
* Seal it as well as you can
* do NOT use Radio Shack barrel connectors as they will invariably break
down during the big JA runs in a contest
Anymore, I try to use hard splices as much as possible for the longest term
solution. I use 1/8 inch hobby store brass tubing that I slit longitudinally
with a dremel tool to slip over the center conductors that are butted
together and soldered. Then I lay the copper shield of RG-11 over the
aluminum shield and smear it up with plenty of silicone grease and seal it
well.
73/Mike, N7ML
Pat Barthelow wrote:
> HI Bill, et al...
>
> For 75 ohm CATV hardline, just hacksaw some (4ea) slots co-linearly with
> a cleanly cut end, on the aluminum jacket.. Make the slots on opposite
> sides of the center conductor, and about 2" long. Dig out the foamed
> dielectric with a pair
> of needle nosed pliers, and an exacto knife. Dig out to a depth of about
> 2". Clean off the residual foam insulation from the copper center
> conductor, which is usually aluminum cored; same for the inside of the
> aluminum jacket.. Try not to gouge the copper center coating too much.
> Gently push on a standard UHF barrel fitting to the close fitting center
> conductor, and use a hose clamp to clamp the shield to the barrel.
> Weatherproof the fitting as necessary. If your sources of CATV cable
> allow choices, be sure and get NON flooded type of cable. Otherwise, the
> flooding goo is difficult to remove from the inside of the shield, and
> center conductor....Though I am told that acetone can remove flooding
> goo....
>
> We are using many such connectors at N6IJ....work great!
>
> 73, DX, de Pat, AA6EG/N6IJ;
>
> aa6eg@hh.tmx.com
> 599 DX Drive, Marina CA 93933
> "The Contest Station from the Government"
>
> On Sat, 14 Nov 1998, Bill Maddock wrote:
>
> >
> > To towertalkrs:
> >
> > I need information regarding making connectors for 3/4" and 1/2"
> > hardline to a LMR400/9913 connection. Any ideas will be greatly
> > appreciated!
> >
> > 73 de Bill N4ZI Atoka, TN
> >
> > --
> > FAQ on WWW: http://www.contesting.com/towertalkfaq.html
> > Submissions: towertalk@contesting.com
> > Administrative requests: towertalk-REQUEST@contesting.com
> > Problems: owner-towertalk@contesting.com
> > Search: http://www.contesting.com/km9p/search.htm
> >
>
> --
> FAQ on WWW: http://www.contesting.com/towertalkfaq.html
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: owner-towertalk@contesting.com
> Search: http://www.contesting.com/km9p/search.htm
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Hello Pat:
<P>I have been using this exact method for about 25 years now. I
have learned a few things in the process:
<UL>
<LI>
DO NOT use penetrox because with time it will migrate and cause a blow
out (always in the middle of a European run in a contest)</LI>
<LI>
DO use silicone grease between the aluminum shield and the barrel connector
to keep corrosion down.</LI>
<LI>
Seal it as well as you can</LI>
<LI>
do NOT use Radio Shack barrel connectors as they will invariably break
down during the big JA runs in a contest</LI>
</UL>
Anymore, I try to use hard splices as much as possible for the longest
term solution. I use 1/8 inch hobby store brass tubing that I slit
longitudinally with a dremel tool to slip over the center conductors that
are butted together and soldered. Then I lay the copper shield of
RG-11 over the aluminum shield and smear it up with plenty of silicone
grease and seal it well.
<P>73/Mike, N7ML
<P>Pat Barthelow wrote:
<BLOCKQUOTE TYPE=CITE>HI Bill, et al...
<P>For 75 ohm CATV hardline, just hacksaw some (4ea) slots co-linearly
with
<BR>a cleanly cut end, on the aluminum jacket.. Make the slots
on opposite
<BR>sides of the center conductor, and about 2" long. Dig out the
foamed
<BR>dielectric with a pair
<BR>of needle nosed pliers, and an exacto knife. Dig out to a depth
of about
<BR>2". Clean off the residual foam insulation from the copper center
<BR>conductor, which is usually aluminum cored; same for the inside of
the
<BR>aluminum jacket.. Try not to gouge the copper center coating too much.
<BR>Gently push on a standard UHF barrel fitting to the close fitting
center
<BR>conductor, and use a hose clamp to clamp the shield to the barrel.
<BR>Weatherproof the fitting as necessary. If your sources of CATV
cable
<BR>allow choices, be sure and get NON flooded type of cable. Otherwise,
the
<BR>flooding goo is difficult to remove from the inside of the shield,
and
<BR>center conductor....Though I am told that acetone can remove flooding
<BR>goo....
<P>We are using many such connectors at N6IJ....work great!
<P>73, DX, de Pat, AA6EG/N6IJ;
<P>aa6eg@hh.tmx.com
<BR>599 DX Drive, Marina CA 93933
<BR>"The Contest Station from the Government"
<P>On Sat, 14 Nov 1998, Bill Maddock wrote:
<P>>
<BR>> To towertalkrs:
<BR>>
<BR>> I need information regarding making connectors for 3/4" and 1/2"
<BR>> hardline to a LMR400/9913 connection. Any ideas will be greatly
<BR>> appreciated!
<BR>>
<BR>> 73 de Bill N4ZI Atoka, TN
<BR>>
<BR>> --
<BR>> FAQ on WWW:
<A HREF="http://www.contesting.com/towertalkfaq.html">http://www.contesting.com/towertalkfaq.html</A>
<BR>> Submissions:
towertalk@contesting.com
<BR>> Administrative requests: towertalk-REQUEST@contesting.com
<BR>> Problems:
owner-towertalk@contesting.com
<BR>> Search:
<A HREF="http://www.contesting.com/km9p/search.htm">http://www.contesting.com/km9p/search.htm</A>
<BR>>
<P>--
<BR>FAQ on WWW:
<A HREF="http://www.contesting.com/towertalkfaq.html">http://www.contesting.com/towertalkfaq.html</A>
<BR>Submissions:
towertalk@contesting.com
<BR>Administrative requests: towertalk-REQUEST@contesting.com
<BR>Problems:
owner-towertalk@contesting.com
<BR>Search:
<A HREF="http://www.contesting.com/km9p/search.htm">http://www.contesting.com/km9p/search.htm</A></BLOCKQUOTE>
</HTML>
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--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm