[TowerTalk] re Hardline connectors
n4zr at contesting.com
Fri Feb 23 16:00:33 EST 2007
Hi Rob - it is really dead easy - I just wanted to give credit where due and avoid some typing.
The plumbing fitting is a 1/2" copper tubing to 1/2" water pipe coupling (3/4" ID, female pipe thread). The Amphenol barrels have a snap ring in one end that secures the internal parts. Use a hacksaw to cut down to the snap ring and remove it. All the innards will fall out. Silver solder the barrel shell into the copper tubing end of the coupling, with the fixed (non-snap-ring end) outward.
Drop one insulator back into the barrel, and temporarily reinsert the center conductor of the barrel so that it is back in its original position. Spread the free end of it a little, so that it will go over the center conductor of the hardline. Trim the hardline shield and center conductor so that you can thread the coupling onto the hardline shield until the barrel center conductor is in the right place. Solder the barrel center conductor onto the hardline center conductor, and use some Noalox on the threads as you thread the coupling on.
Does the word picture make sense?
At 12:52 PM 2/23/2007, Rob Atkinson, K5UJ wrote:
>The towertalk archive goes back to 1996 and earlier mentions of W4AN's post
>say it was in 1995 and I am unable to find it in a search. If you have it
>and could repost it or post what he wrote, even just the materials he used,
>that would be great. With a parts list we could probably figure the rest of
>rob / k5uj
><<<Just FYI, the RF Connection in Gaithersburg MD is a good source for used
>hardline connectors. They come simply lopped off the ends of the cable they
>were on, so you can "reverse engineer" how they are installed, and once you
>it, it's VERY simple. These connectors are N females, but they are a lot
>cheaper and more plentiful that UHFs for 1/2 inch line.
>If you're interested in homebrewing your own UHF females for 3/4" TV
>check the Towertalk archives for a message from W4AN (SK) that explains how
>do it with an Amphenol barrel connector and a $2 plumbing adapter. For HF,
>half-wave multiple idea worked fine for me here from 160 to 10 meters,
>matching transformers. I cut the feedline to be a multiple of a half-wave
>1750 KHz, and then measured and trimmed the length at 28 MHz.
>73, Pete N4ZR>>>
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