"Richard Clark" wrote in message
news
On Fri, 11 Sep 2009 23:32:39 +0100, "christofire"
wrote:

I'd be convinced if the
protagonist managed a truly isotropic pattern at just one frequency.

Hi Chris,

Half-Isotropic (if you allow for total field - you didn't specify and
any protoplasm could game that loose specification) at:
http://www.qsl.net/kb7qhc/antenna/In...-1%20Field.gif

The design has been kicking around for 10+ years now at that link, and
not even original when I posted it.

As for gaming the lack of polarization spec, I might simply offer that
it doesn't matter - if you use an isotropic detecting antenna to
measure the field of this antenna model in the link. For that
isotropic detecting antenna, I would offer a golf-ball lump of coal
and a thermistor.

73's
Richard Clark, KB7QHC


Well the title of the thread is 'Spherical radiation pattern' and I
interpret that as meaning a far-field pattern that is uniform (within the 2
dB margin I offered) in respect of the transverse electric, or transverse
magnetic, field strength, or the resulting power-flux density, over a whole
sphere.

I'm not sure what you mean by 'total field' in respect of a far-field
pattern - all induction components should be insignificant including any
'cross-field' longitudinal ones. Also, my wager is in respect of a hardware
antenna being built, not an NEC model.

Regarding your lump of coal and a thermistor - how would you connect the
thermistor? Surely that would impose some kind of polarisation however it
was done ...?

Chris