[TowerTalk] Grounding the coax
nv8a at att.net
Thu Nov 3 23:53:47 EST 2005
I must be getting old, Gene. I looked back and saw that I had already
marked that previous message of yours for further attention but then
forgot that the subject had been raised at all.
On 11/03/05 11:38 pm ersmar at comcast.net tossed the following ingredients
into the ever-growing pot of cybersoup:
> I ran into the same issues when installing my coax grounds on my tower. The most vexing to me was the price for commercial straps. So I devised my own using copper flashing and posted here on TT at: http://lists.contesting.com/archives//html/Towertalk/2005-10/msg00778.html . (Make sure you paste the entire URL into your browser.)
> One significant advantage (to my way of thinking) to this approach to shield grounding is that you don't introduce another pair of potential failure points - the two PL-259s - into the coax system.
>>In his articles on lightning protection in QST in 2002, Ron Block KB2UYT
>>emphasizes the need for grounding the coax at the top and bottom of the
>>tower (and perhaps at intermediate points, depending on the height of
>>the tower). I doubt that anybody will argue with this, but the question
>>Polyphaser sells expensive kits for grounding the coax: hefty
>>semicircular hunks of copper that are clamped around the coax shield
>>after removing its outer covering, then grounded to the tower by wide
>>copper straps. Of course waterproofing is then applied to the coax where
>>the outer covering was removed.
>>But would simply interposing a barrel connector and securing a ground
>>wire to that with, say, a hose clamp, then connecting that ground wire
>>to the tower be significantly worse? Again, of course, the section with
>>the barrel conenctor and PL-259s (or whatever) would have to be well
>>sealed against the weather.
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