The phone companies have been pumping air into their cables (paper insulated
no less)for years.
They have compressors with dehumidifiers on them located in their air
conditioned central offices. The compressor/air dryer may cost more than the
N tanks to place and maintain?? But it can be done.
[mailto:firstname.lastname@example.org]On Behalf Of Courtney Judd
Sent: Wednesday, May 28, 2003 9:06 PM
Subject: [TowerTalk] Feedline question
I have an interesting question for the gurus out there. I have been hired as
the remote site manager for a fm station. Basically, I just look after the
site and keep the operation up and going. The question pertains to
pressurized Nitrogen and the feedline. This is 600 feet of 4 inch hard-line
with N tanks hooked to it supposedly to keep moisture out. This feedline is
old and has what I believe to be many pinholes thru out it. Management won't
consider replacement but is complaining about the number of bottles of
compressed N that I am using. What about replacing N with a small air pump
and keep the feedline pressurized with air taken from inside the transmitter
house... air conditioned and de-humidified... air is 70% N anyway! It's
running 18 KW out and SWR on the feedline is 1:1. Any comments or ideas?
Courtney Judd K4WI / NA4W
2300 County Road 61
Uniontown, Alabama 36786
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
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