[TowerTalk] [Bulk] another subject: coax and cables buried or elevated above ground?

[Roger (K8RI) on TT]

For those who think moisture*/*water in the conduit is a problem, just 
set the shop Vac on the end and hook the exhaust to one end of the 
conduit.  Some of those shops are designed to also be used as blowers 
with an advertised exhaust speed of 200 MPH.  That will dry that conduit 
in a hurry with the conduit half full of cables.  As long as there is 
good air flow, the shop Vac should be able to run a long time without 
over heating.  Do this when ever you suspect moisture which is probably, 
more likely in warm weather.

Build an adapter using a "T" so all the air flows through the conduit. 
Run the coax out the side of the "T", seal with the soft, expandable 
"foam in a can", and hook the shop Vac to the other. Most hardware 
stores carry adapters that will go from the shop vac hose to the conduit 
size.  For the least restriction get one the hose fits inside instead of 
over.  If it's a sloppy fit, just use the universal adapter, "Duct Tape".

BTW:  They do make caps to fit over the end of those adapters. They are 
typically found with the whole shop dust collector systems.  I have one 
that fits over 5" hose.  Now if you could fit the exhaust of one of 
those blowers to the conduit, it'd blow liquid water out of the conduit, 
but they are "NOISY"!   Mine has a 10 or 12" impeller made of 1/4" steel 
plates, that will swallow anything the two, 5" vacuum hoses pick up 
including nuts and bolts.

They do make portable units, but they might be a bit pricy and heavy.

73

Roger  (K8RI)


On 1/28/2016 Thursday 4:02 PM, jimlux wrote:
> On 1/28/16 11:10 AM, Grant Saviers wrote:
>> This topic comes around on a regular basis.  Lots of comments in the
>> archives.
>>
>>
>> In theory an oil less air compressor and refrigerated shop air dryer
>> would work if you are willing to buy them and pay for the kwh of
>> electricity.  My shop dryer is good for 40 d F dew point air at 150 psi
>> which when expanded to ambient 14.7 psi has a dew point of -10 d F (I
>> found an on-line calculator at
>> http://www.dew-point.com/dew-point_calculator.asp)  (an interesting fact
>> - why wet things can be dried so quickly with a shop air blow gun, I
>> didn't know that ambient value).
>
>
> that's also why you have to drain the condensate from your 
> compressor's receiver.
>
>
>
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-- 

73

Roger (K8RI)


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