I see a couple of flaws:
a. A fan won't push air through a long tube. You need a pump that can
actually generate some pressure.
b. Now you have a higher pressure area in the feed from the pump
exiting to a lower pressure area in the tube, the result of which
typically generates condensation. You have a similar pressure
differential near the output of the tube. They put condensate drain
plugs on compressor tanks for a reason.
On 4/30/2011 12:51 PM, Clint Talmadge W5CPT wrote:
> I am about to add a couple of antennas and the idea of burying conduit for
> the coax and control cables came up again. The stories of water collecting
> made me think of how to avoid this. What if I were to add a small fan to
> the box to which I am going to hang on the outside wall of the shack to
> which I am going to connect the conduit? This fan would pressurize the
> ambient air which should eliminate any standing water in the system. A
> small shroud to keep out the direct rain should be sufficient. Small
> screened weep holes in the boxes at the tower base and the box for the
> phasing network for the verticals would allow any moisture in the
> pressurized air to escape. The fan, being outside should not cause any
> objectionable noise. I am thinking of something along the lines of a larger
> muffin fan which will run off house power fed out through the conduit
> installed through the wall.
> I have tried to come up with any negatives, but have not (yet). Any ideas,
> positive or negative on this plan?
> Clint - W5CPT - West Kentucky
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