[TowerTalk] Feedline question

Chuck Counselman ccc at space.mit.edu
Wed May 28 23:57:53 EDT 2003

At 8:05 PM -0500 5/28/03, Courtney Judd wrote:
>...The question pertains to pressurized Nitrogen and...600 feet of 4 
>inch hard-line with N tanks hooked to it supposedly to keep moisture 
>out.... 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....

The humidity of that air is probably not sufficiently low to prevent 
condensation within your feedline when the outside temperature is 
very low.  You must reduce the "dew point" of that air safely below 
the outside temperature.  An ordinary room air-conditioner won't do 
this.  In industrial supply catalogs you'll find driers that will.  I 
don't know what they cost.

-Chuck, W1HIS

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