[Towertalk] Ladderline near tower

[Steve Katz]

PVC tubing to stand off the line from the tower at the top, bottom and a few
places in between seems to work.  12" spacing should be sufficient for 600
Ohm open-wire, a bit less should suffice for ladder line, which will have
closer conductor spacing.  I've used stainless steel screw-eyes threaded
into the PVC tubing, and spaced apart the same distance as the conductors in
the open wire, to let the line "slip" up and down a bit, rather than be held
rigidly in place, so the line can bob a bit in the wind, but never come
close to touching the tower.

(I've also used "nothing" to stand off 450 Ohm well-insulated ladder line,
for years, with no measurable ill effects at all.  The line normally hangs a
few inches away from the tower, but in the wind, can bang into the tower --
doesn't seem to matter much.  Even running 1500W through it when this
occurs, I've never had it "flash" through the insulation, and never note any
large changes in match.)

-WB2WIK/6

"If everything seems under control, you're just not going fast enough." -
Mario Andretti

> -----Original Message-----
> From:	k0myw@att.net [SMTP:k0myw@att.net]
> Sent:	Friday, August 23, 2002 10:12 AM
> To:	towertalk@contesting.com
> Subject:	[Towertalk] Ladderline near tower
> 
>    I'm thinking of trying a dipole fed with old-
> fashioned 600-ohm ladderline.
> 
>    It occurs to me that, because the dipole will be 
> center-hung from my tower, that I might ought to pay 
> more attention to interaction possibilities with this 
> feedline than when feeding a wire antenna with coax.
> 
>    Any advice/warnings about how to approach a tower-
> hung dipole with open-wire feeders?
> 
>    Mike, KØMYW
> _______________________________________________
> Self Supporting Towers, Wireless Weather Stations, see web site:
> http://www.mscomputer.com
> Call 888-333-9041 to place your order, mention you saw this ad and take an
> additional 5 percent off
> any weather station price.
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk