[TowerTalk] HST4-50 Heliax

[Keith Dutson]

This coax is great.  I use it on my club's VHF repeater.  It has been up for
four years.  The only negative I can find is higher cost.  As you say, use
only good connectors, and seal properly against water intrusion.  I use
Andrew L4PNF-RC connectors, Scotch Super 88 and Scotch 2228. 

73, Keith NM5G

-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Jim Brown
Sent: Wednesday, May 13, 2020 2:55 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] HST4-50 Heliax

On 5/13/2020 12:21 PM, Ronald Zerr wrote:
> Can it be buried, is it uv resistant like ldf4?

Google is your friend. I searched on HST4-50. The fourth result on the first
page was the data sheet.

https://www.americanradiohistory.com/hd2/IDX-CATALOGS/IDX/Miscellaneous/Andr
ew-Catalog%2038-2001.CV01-OCR-Page-0549.pdf

The description says that it's an air-dielectric high temperature cable
rated for use in a plenum. A plenum rating requires jacket and dielectric
materials that minimize flame spread and noxious fumes in the presence of a
fire. The fact that it's an air dielectric suggests that weatherproofing of
connectors would be crucial if used outdoors. The concern with direct burial
would be damage to the shield from sharp rocks that could allow water
intrusion. UV damage would be limited to the outer jacket and possible
corrosion of the copper shield with moisture, but since RF current is on the
inside of shield, RF performance would not likely be affected.

73, Jim K9YC
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