On Feb 1, 10:41*am, m II wrote:
On 11-02-01 11:22 AM, bpnjensen wrote:

Question - does the additional Poly tube around the coax diminish the
capacity to provide (presumably useful) inductive ground for the
buried cable?

Seems to me that anything resembling an inductive ground would be a bad
thing. The inductive coupling effect would vary completely with the
frequency of the signal, proximity, length, etc. Not good.

Don't settle for anything less than a real, lowest possible impedance,
honest to G_d, mechanically connected ground. I usually smear the wire
connection and electrode with vaseline after having sandpapered them.
Then do your clamping. A plastic cup inverted over the end of the ground
rod will keep the rain out of the joint.

mike

Well, that's not quite what I meant - I am sorry if I was unclear.

IIRC, there is nothing at all wrong with burying a cable, and in fact
it helps to keep the RFI away from the run, as well as keeping the
outer braid near the earthen ground and helping to bleed away currents
travelling along the braid. That is what I was asking about - whether
a poly tube would lessen this desirable effect.

I have every intention of grounding the 9:1 unun, presuming it will
enhance performance (if it does not, I'll disconnect it). If
necessary, I'll also install the RF Isolator and try it both grounded
and ungrounded.

I had never heard that it was necessary to keep a solid mechanical
ground water-free, although I guess I can see the value. I don't
understand what vaseline does - just protect against corrosion? I
doubt if it would help the electrical connection.