Hi Rob,
I think I'd try something I'm more sure is grounded. If I remember
correctly, the coax shield between the loop and the electronics is NOT
grounded. I seem to remember the installation materials saying NOT to
ground that section of coax. So shorting the aluminmum of the loop to
the shell of the BNC might not yield a ground. But then, that would
probably short out the antenna?
Dave
--- In loopantennas@..., "Rob Moore" <rmoore5@...> wrote:
I have one up a tree and can try that tonight. I assume that
grounding the aluminum loop to the shell of the BNC connector is what
you're referring to?
Rob
--- In loopantennas@..., "n2chi" <davidgriffin@> wrote:
Does someone have a Wellbrook loop in a convenient enough location to
ground the shield and see what happens? If it's the antenna, then
it
won't act like one when grounded. If it's not the antenna, would
there
be any noticeable effect of grounding it? Please don't make me got
out
and drive a stake in the ground......
Dave
--- In loopantennas@..., gandalfg8@ wrote:
In a message dated 14/05/2007 21:08:36 GMT Daylight Time,
christrask@ writes:
Patrick is absolutely correct in stating that the aluminum shield
(aka
the outer conductor)is the actual antenna. This is the manner in
which
shielded loops function at their operating frequency. At very low
frequencies where most electrical field noise exists, the currents
and
voltages of both arms of the outer conductor are equal in both
potential and
polarity (provided the gap is at the exact centre), with the
currents
being
the same on both surfaces of the outer conductor material and
zero at
the
gap. The currents that are coupled to the inner conductor(s)
cancel
so that
there is no net noise current delivered to the receiver.
-------------------------------------
Hi Chris
The Wellbrook isn't a shielded loop antenna.
There no gap in this loop, other than inside the housing at the
bottom
where
it connects to the amp.
regards
Nigel
GM8PZR
