[TowerTalk] Feedline Coil or Loop??

[GALE STEWARD]

I've done mine that way and it's been fine for the
last 28 years! I have two RG8-type feedlines taped
together with the lower antenna being two feet above
the tower top plate.

73, Stew...


--- "Jerry Keller (K3BZ)" <k3bz at arrl.net> wrote:

> I've always used a feedline "loop" that hangs out
> and down from the tower 
> leg that's half-way on the rotation circle, is
> attached to the boom a few 
> feet out from the mast, and is long enough that it
> doesn't impede antenna 
> rotation in either direction.  I recently saw an
> installation with the 
> antenna mounted about 2 feet up the mast from the
> tower top,  with the 
> feedline coiled about 2 turns loosely around the
> mast rather than hanging 
> down. The antenna end of the coax was attached at
> the bottom of the 
> mast-to-boom plate.  The arrangement looked like
> those coils of cable that 
> the TV trucks deploy when they raise their microwave
> towers, but only a 
> couple of turns to the coil.  When rotated in one
> direction the coil got 
> tighter to the mast, but not touching it.  In the
> other direction the coil 
> got looser.
> 
> My question is.... is this a good idea?  I have
> never seen it before, so 
> maybe it isn't in widespread use, which makes me
> wonder why not.... as it 
> "appears" that it would put less stress on the coax
> than the usual U-shaped 
> arrangement.
> 
> Any comments or experiences about this?
> 
> 73, Jerry K3BZ
> 
> ----- Original Message ----- 
> From: "John Elsik" <wa5zup at msn.com>
> To: <towertalk at contesting.com>
> Sent: Monday, July 23, 2007 11:58 AM
> Subject: Re: [TowerTalk] Antenna/mast height above
> tower?
> 
> 
> > Since most tower manufacturers spec so many sq ft,
> 1' above the top of the 
> > tower.  Then mounting the antenna 1' above the top
> would seem reasonable. 
> > The main thing is to have enough room for the
> cable loop, so it does not 
> > snag on anything.
> >
> > John
> > wa5zup
> >
> >
> >
> >> From: km1h at jeremy.mv.com> To:
> rusty_atkins at yahoo.com; 
> >> towertalk at contesting.com> Date: Mon, 23 Jul 2007
> 11:08:41 -0400> Subject: 
> >> Re: [TowerTalk] Antenna/mast height above tower?>
> > 1 inch. As long as no 
> >> part of the antenna or mount scrapes the tower
> you are > OK.> > Carl> 
> >> KM1H> > > ----- Original Message ----- > From: "R
> Atkins" 
> >> <rusty_atkins at yahoo.com>> To:
> <towertalk at contesting.com>> Sent: Monday, 
> >> July 23, 2007 10:08 AM> Subject: [TowerTalk]
> Antenna/mast height above 
> >> tower?> > > >I haven't seen many recommendations
> on this. I've googled 
> >> and searched > >eham.net to no avail.> >> > What
> is the minimum height 
> >> above the tower top shelf recommended for an HF >
> > beam (KT34A, FWIW). 
> >> I'm trying to run as short of a mast as possible
> > > without impacting 
> >> performance of the antenna.> >> > Thanks!> >
> Rusty> > K0FE> >> >> >> >> > 
> >>  > > 
> >>
>
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