[TowerTalk] Cable TV hardline question

[Keith Dutson]

The difference in the two is likely power handling and loss rating.  The
bigger size probably has a larger center conductor, better dielectric
material and shielding, which normally gets the higher ratings.

If you can spare the extra bucks, get the Buryflex or similar 50 ohm cable.
Your transceiver with thank you for it.  For runs more than a couple hundred
feet you will suffer considerable loss with .4 inch cable at 30MHz and
above.  Many prefer to pay extra for larger diameter cable which is rated
for lower loss, such as LMR600.  I have a long piece of Andrews 7/8 hardline
(taken from a cell tower being upgraded to 1.5 inch) which is really low
loss for longer runs.

Keith NM5G

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Al Williams
Sent: Friday, October 29, 2004 10:54 AM
To: TowerTalk at contesting.com
Subject: Re: [TowerTalk] Cable TV hardline question


----- Original Message -----
From: "SJ W3TX" <superberthaguy at adelphia.net>
Sent: Thursday, October 28, 2004 6:35 PM
> So the question is, is the 75ohm aluminum shielded hardline of good
quality
> or not?  Is it acceptable for running trunklines to the beverages? How
long
> will it last buried not inside a pipe?
>


Can someone explain the difference between 75 ohm aluminum shielded hardline
and "plain old 75 ohm TV coax"? I was given two partial rolls OF 0.4 inch
DIAMETER aluminum shielded, white core insulation coax.  One roll is labeled
Commscope along with a telephone handset imprinted on the jacket.  The other
roll has no identification but does include a messenger wire embedded in the
outer jacket.

I estimate perhaps 500' of this coax and I do have a tower 300' from the
shack that as yet is not connected.  I have been thinking of using BuryFlex
for this run but can this free coax possibly be better?  Should I give these
two rolls away and go with something well defined?

K7PUC


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