On Oct 1, 3:09 pm, "Dale Parfitt" wrote:
wrote in message

ps.com...
In the RFI/EMI world the maximum length
of grounding conductors has been found
to be 1/20 of a wavelength. Conductors
longer then 1/20 of a wavelength become
effective unintentional radiators. It is true
that we consider a 1/4 wavelength to be
the most effective and desirable length.
But significant radiation does occur from
even cables as short as 1/20 WL.

A 1/4 wavelength long ground wire is the WORST possible length. A 1/4
wavelength line acts as an impedance inverter (just as in transmission
line). So the low Z at the ground rod gets transformed to a hi Z at the
radio- making the ground totally ineffective.

Dale W4OP

Hi, Dale. On your SW insulated wire antennas, do you then recommend
using a ground at all, or just go with the ungrounded cable-to-wire
junction?

I am seriously thinking about getting two of these gems and phasing
them, if I can make the geometry work on my constricted lot...if I
don't have to ground them, I'd be way ahead of the game for other
reasons. If grounding is better, would separate ground rods be
appropriate?

Thanks!
Bruce Jensen