Patrick,
You are wrong that the Aluminim is the actual antenna. There are
wires inside of it and it is only there as a mechanical support. I
know this because I've removed the potting material from one of these
to find out. This can also be verified by examining the 5030. It is
a semi-ridgid version of the ALA-1530.
Rob
This--- In loopantennas@..., Patrick Reynaert
<preynaert@...> wrote:
Hi,
the wellbrook is not a shielded antenna, the Aluminium tube is the
actual antenna.
Shielding (with a gap of course) a loop only shields it from
electrical noise at very low frequecies, i.e. at frequencies where the
shield thickness is less than the skin depth. At higher frequencies,
where the shield is thicker than the skin depth, the shield only helps
to get a better balance, and hence a better 'null' in the reception
pattern.
Patrick.
Hue Miller <kargo_cult@...> wrote: Wellbrook antenna: is the loop
shielded? I am guessing maybe not,
since its performance still seems to be good into the VHF range.
IF not - will shielding such a loop, be worthwhile to diminish
electrical field noise?
I am thinking a "Hula Hoop" toy might be a basis for a homemade
loop. Cut open the loop, feed wire thru it, and glue back together.
Maybe with aluminum foil wrapped around the thing, for shielding,
and amplifier module attached right to the loop.
WL1030 page - i very much look forward to reading the material
there. I just wonder why it is necessary to "register". What is the
thinking behind that?
-Hue Miller
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