Topband: Receive antenna switching

[Gene Smar]

Dave:

     I've advised others on the TowerTalk reflector to drill quarter-inch or 
half-inch diameter holes on the underside of plastic conduit at the low 
spots so water will drain from within.  To prevent ingress of insects, 
rodents, etc., I further advised the installation of landscape cloth (which 
permits the flow of water in only one direction through the fabric) around 
the conduit at the holes and tie it in place with wire.

     To collect and divert the drained water from within the conduit, I also 
suggested digging a small sump pit underneath the drilled holes and filling 
the pit with gravel or crushed stone.  In that way the drained water will be 
absorbed by the space between the rocks/gravel until it can percolate 
through the soil.

     I've used these techniques on my own tower conduit in the back garden. 
I've not had problems with water freezing and harming the coax within the 
conduit.


73 de
Gene Smar  AD3F


>
> Regarding Doug's advice about running cables inside some form of conduit.
> My worry with this is the strong possibility (with the wet UKs weather at
> least!), of the conduit becoming permanently flooded with rainwater by
> ingress at the entry/exit points or joints/cracks etc.
> That wouldn't seem very desirable on the face of it. But is it really a
> potential problem and if so what are the Group's thoughts on preventative
> measures please?
> Thanks
> Dave
>