"Airy R. Bean" wrote in message
...
Anybody know anything about the internal configuration
of these?

I bought one on behalf of my friend yesterday at Wimborne
to replace the 5/8ths one (not a colinear - misunderstanding)
that had been badly manufactured (q.v.)

On this Diamond, it gives an SWR of 1.01:1 and yet a DC test
shows no continuity between the centre of the coax and the
vertical radiator - the outer of the coax shows a dead short
to the monopole.

How are these things wired internally? - Mystified

Why, it isn't complicated. There is a matching network, details depends on
the version you have. Some have a tapped parallel tuned circuit, some a coil
tapped with a C to the monopole.

So much for our resident expert....................