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Re: Topband: Adding connectoirs to CATV Hardline

Subject: Re: Topband: Adding connectoirs to CATV Hardline
From: Stan Stockton <>
Date: Fri, 5 Jun 2020 05:36:07 -0500
List-post: <>
It isn't fancy but very easy to do what I did 20 years ago on the phasing lines 
for 80m 4 Square.  I just cut pieces of 5/8" aluminum tubing about 2 inches 
long and used a band saw to make four slits in each end.  Perfect fit over the 
1/2" hardline and PL-259 barrel.  Then a little Noalox and hose clamps for the 
CATV end and the barrel of the PL-259 plus a good taping job.  Never had a 

3/4" hardline connectors are really nice using a 3/4"  (inside threads) to 1/2" 
(straight with no threads) copper fitting that can be self threaded onto the 
hardline.  You need to be able to remove the guts of an Amphenol PL-258 to 
solder it inside the copper fitting.  A dental tool works pretty well for 
removing the retainer ring.  I have used those for over 40 years and have never 
had one fail.

73... Stan, K5GO

> On Jun 4, 2020, at 2:00 PM, <> <> wrote:
> Hi Guys,
>    There is an article in one of the ham magazines from years ago that 
> describes how to make an adapter from brass tubing compression sleve fittings 
> (from auto parts store) that adapts from 1/2 inch CATV Hardline cable to UHF 
> male connectors RG-8 size. Anti-oxidants required. I have been doing this for 
> years with no problems at 1500 watts. There is a pair on my 80 meter 4-square 
> as we speak. Its been so long that I have since forgotten where the article 
> was. Perhaps an internet search would bring it up. I would write something up 
> but I have my hands full at the moment with cleaning up after a tornado like 
> storm with 100 MPH winds that went right over my house. Minimal damage except 
> for the top 1/3 of my 160 vertical and lots of tall trees down in what's left 
> of the yard. All else is fine with nothing I can't repair.
>    Good luck.
> Lee  K7TJR  Culver OR
> Clamps do work ok with CATV hardline, but you have to be careful as it is 
> very easy to crush the hardline. Also, waterproofing is always a pain.
> As W7WKR posted, I also adapt pin connectors, which are the standard way of 
> terminating catv hardline. Here are some comments:
> Pin connectors have the same thread size (5/8") that is found on so-239s or N 
> connectors. They are fairly cheap to buy new or can be found on ebay. One 
> difficulty with pin connectors compared to many other hardline connectors is 
> that it is nearly impossible to install them on catv hardline unless you have 
>  a coring tool of the right size to fit the hardline. This is because the pin 
> connectors clamp onto the shield from both sides, so you have to completely 
> remove the insulation from the hardline for 1-2" back up into the cable. 
> Coring tools are > $100 new, but I have found them used for $20-$40. The used 
> ones are often pretty worn out: however, with care you can sharpen the 
> cutting parts with a file or stone, which makes a big difference. It can also 
> be tricky to figure out how much center conductor you need sticking out for a 
> given pin connector- some of the connectors have little tick marks on the 
> outside that show the correct length to cut the center conductor.
> Once you have the pin connector on, then:
> 1. For type N: the body of a "clamp" type N connector will screw directly 
> onto the pin connector (discard the smaller clamp part with male threads that 
> normally goes on the RG-8). I just cut the pin to length and file the end 
> down to a point. You do have to be careful that the point is not too wide, 
> otherwise it might break the female contact.
> 2. For UHF: there are similar clamp-type UHF connectors available with the 
> same 5/8 thread in the connector body. Here is one example:
> just cut the pin to the right length, solder on the center female connector, 
> and screw the body on.
> 3. You can also just drill a hole in a metal box and attach the pin connector 
> with a nut meant to go on SO239s.
> There are also splice connectors to join two pieces of hardline. These are 
> nice because they don't require any waterproofing. There are also some that 
> end in an F connector instead of a pin.
> Tor
> r
> _________________
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