On Fri, 17 Oct 2008 17:23:05 -0400, "Bill Ogden"
wrote:

I seem to remember reading that running coax underground acts like a current
choke. However, my memory has many missing bits these days. Is this a true
statement about coax underground? In my case the run is about 40' (in a
conduit that is about 10" under ground). I am interested only in the normal
HF bands.

Hi Bill,

The coax shield is no different in loss as is a ground radial wire of
the same dimension. Visit any site that offers the data of Brown,
Lewis, and Epstein to observe that for their experiments at 3MHz, the
amount of radial conductivity drops like a rock well in advance of the
end of the wire (where it would be forced to zero by being open).

You might get it to conduct a bit further by having insulated it from
ground (the conduit), but it is still easily within ground's deadly
embrace.

73's
Richard Clark, KB7QHC