[TowerTalk] Long feedlines

[Rob Atkinson, K5UJ]

okay i missed the crank up part or forgot it--sorry about that; tnx for the 
correction--of course for a crank up, heliax is out of the question.    As 
one who is not there, there is obviously a lot about this situation I don't 
know, but it seems kind of unusual to me that a crank up would be located 
that far out from the shack.   In any event, LMR is probably the way to go.  
Andrew has a "flex" heliax but I have never handled it and don't know much 
about it at all.

rob/k5uj


From: Steve Katz <stevek at jmr.com>
To: "'Rob Atkinson, K5UJ'" <k5uj at hotmail.com>, towertalk at contesting.com
Subject: RE: [TowerTalk] Long feedlines
Date: Tue, 13 Sep 2005 16:24:48 -0700

I thought the original post said it was an 89' crank-up tower.  You can't
run Heliax up a crank up unless you crank it up and leave it there.  The
larger "RG-213 type" cables are RG-217/U and then, larger, is RG17/U.  Low
loss for sure but generally heavier than Heliax etc. because it's solid
dielectric.  RG17 is pretty heavy stuff, I don't know I'd torture myself
with it on a tower but it's great for "on the ground," or tied to a
messenger cable, or buried.-WB2WIK/6

-----Original Message-----
From: Rob Atkinson, K5UJ [mailto:k5uj at hotmail.com]
Sent: Tuesday, September 13, 2005 4:14 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Long feedlines


For the 2 or 3 hundred foot run out and up the tower, I'd definitely
consider some kind of andrew heliax (not the stuff you have to pressurize),
the widest diam. you can afford, especially for the 2 m. antenna.   I
wouldn't stop at the tower base--I'd go right up it to the point where the
rotator is before a transfer to something that will loop around and flex.
Some guys swear by the coax that's like RG213 only 1 inch diam. (RG18? can't

remember) and while it can handle a lot of power,  I've seen it way up there

in price, > $10/foot and it's heavy, and the dielectric wants to slide
inside because of its weight when going vertical.  I'd try heliax first.
price it at www.davisrf.com

for the tv ant. on the mountain, how long is the run?

rob/k5uj

btw, for a long long run, as in 1000 ft. or more, on HF and below, from a
loss standpoint, the best thing is probably still open wire feed.

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