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Re: [TowerTalk] Hardline - PL-259

Subject: Re: [TowerTalk] Hardline - PL-259
From: David Gilbert <>
Date: Tue, 25 Sep 2012 00:36:08 -0700
List-post: <">>

Sorry for the careless typing ... I meant LDF4-50A 1/2" Heliax.

Dave   AB7E

On 9/25/2012 12:19 AM, David Gilbert wrote:

The Watts (brand name) A-200 fitting is a 7/16" female to 3/8" tube compression adapter, and the 7/16" end fits perfectly on an SO-239 barrel. It literally is an exact match. Not sure what you mean by a PL-259 barrel.

If you file the threads down just slightly on the 3/8" end (minus the compression nut that comes with it) of the A-200 it makes a snug fit INSIDE 1/2" copper plumbing tube, which in turn makes a nice fit OVER the copper jacket of LDF-50A 1/2" Heliax ... which was my original interest although I suspect something similar might be usable for 1/2" CATV cable.

Dave   AB7E

On 9/24/2012 11:38 PM, K8RI wrote:
On 9/25/2012 1:47 AM, David Gilbert wrote:

I don't know about what fits or doesn't fit CATV hardline, but I do know
that there is a common brass fitting that fits an SO-239 barrel
exactly.  Check out an "A-200" fitting in the plumbing section of Home

The half inch compression fitting is fairly close fit to the PL259 barrel. Not exact but close. Just take your coax connector into Lowe's or Home Depot...or your local hardware store and you'll find some that fit.

Dave  AB7E

On 9/24/2012 9:00 PM, Hans Hammarquist wrote:
I have s.k. TV-hard-line (70 ohms) coax that I am planning to use for
my set-up. My idea was to attach some bulk-head SO-239

The bulkhead connectors are threaded full length and make poor adapters. There are versions just like PL259s, but female that make very good adapters to compression fittings.

to the cable
with the help of brass oil compression coupling (I'm told that's the
way to go.) I measured the cable and the outside of the aluminium
shield is 1/2 inch (give or take a few .001". The bulk-head connector
seems more like 9/16" and I don't know if there is such an animal as
1/2 - 9/16" adapter around the oil couplings. (The inner conductor
seems to be wide enough to fit, if I do "some magic with the inner

Can I turn down the thread on a bulkhead from 9/16" to 1/2" or will
that give too little material left for strength?

Normally you should be able to turn the threads down as you only have to take off 1/32nd of an inch and that should still leave enough material be far stronger than the half inch TV coax which is itself quite fragile. Bends need to be on the order of about an 18" radius for safety. The 1/2" stuff is very easy to kink.

It's easier though just to find a female UHF coax connector and connect it to the coax using a compression coupling.

 Is there some
plumbing thread that (almost) fit the SO-239 thread? Any suggestions?

No. Pipe thread is tapered and much more coarse than the threads on UHF connectors.

Look at the 4th and 5th photos down on
There is a female connector made exactly like the PL-259, except it's a
female connector and it fits the compression coupling the same way. It's a very easy to make adapter.

Check the coax dealers and you should find the female version.


Roger (K8RI)

As usual, I am open for ideas. (E.g. I will move my shack to the tower
so I don't need any catenary between my tower and my shack.)

Hans -N2JFS

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