Re: gEDA-user: Tin pest[Scanned]

[Gene Heskett <gene.heskett@xxxxxxxxxxx>]

On Sunday 05 February 2006 07:57, Robert Thorpe wrote:
>> -----Original Message-----
>> From: owner-geda-user@xxxxxxxx
>> [mailto:owner-geda-user@xxxxxxxx] On Behalf Of Bob Paddock
>> Sent: 04 February 2006 19:48
>> To: geda-user@xxxxxxxx
>> Subject: Re: gEDA-user: Tin pest[Scanned]
>>
>> > Good is also putting 100m of UTP cable on a flat roof. If it
>> > rains, the cable lies in ponds of water and the RF energy which
>> > travels partially outside gets lost in the water. Packetloss at
>> > 100Mbps results. We had this problem.
>>
>> The local Amateur 2M repeater had a 200 foot tower next to
>> the building.
>> The repeater was on the second floor of the building, but the
>> cable went from the bottom of the tower to the building underground.
>>
>> Took the connector off of the repeater to do some service
>> work and buckets of water poured out of the hard line coax.
>> Capillary action to suck it up to the second floor, or simple
>> push down the 200 foot of coax coming down the tower?  Either
>> way I was not impressed with being all wet.
>
>This is quite a common problem.  N-type and 7/16 coax cables have
> rubber seals in them to attempt to prevent water from the inner
> leaking into equipment.  In some climates the coax cables on
> cellphone towers have to be replaced every 12 months because of the
> water.

At the price of that, wouldn't air lines & a bottle of GN2 be indicated?
Sure makes sense to me anyway.  1/4 of a psi in the line stops all that 
stuff since the water can't get in in the first place.

-- 
Cheers, Gene
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Copyright 2006 by Maurice Eugene Heskett, all rights reserved.