On Tue, 11 Jan 2005 09:50:30 -0800, Richard Clark
wrote:

On Tue, 11 Jan 2005 17:14:58 +0000, Spike
wrote:
I also believe that Walt's information has been
published in roughly similar form many years ago, although I don't
have the reference to hand.

Hi OM,

There's a good chance it was from one of Walt's own many publications,
or it was, as he said, Dr. George H. Brown (the nominal, ultimate
source) with whom he worked.

73's
Richard Clark, KB7QHC

My 1978 Antenna Handbook by Orr & Cowen, page 92, references drooping
radials at a 45 degree angle for a better impedance match, raising the
gain of the ground plane antenna by about 0.5 decibel over the normal
configuration.

'Course Walt probably preceeded those guys :-)

bob
k5qwg

"Bob Miller" wrote in message
...
On Tue, 11 Jan 2005 09:50:30 -0800, Richard Clark
wrote:

On Tue, 11 Jan 2005 17:14:58 +0000, Spike
wrote:
I also believe that Walt's information has been
published in roughly similar form many years ago, although I don't
have the reference to hand.

Hi OM,

There's a good chance it was from one of Walt's own many publications,
or it was, as he said, Dr. George H. Brown (the nominal, ultimate
source) with whom he worked.

73's
Richard Clark, KB7QHC

My 1978 Antenna Handbook by Orr & Cowen, page 92, references drooping
radials at a 45 degree angle for a better impedance match, raising the
gain of the ground plane antenna by about 0.5 decibel over the normal
configuration.

'Course Walt probably preceeded those guys :-)

I thnk it predates 1978 by some margin. I may even be in one of the old
"Admiralty Handbooks", if anyone has a copy to hand they could check.

The explanation is a fairly standard one, although Walt does express it
well. If Walt is the originator of the idea I suspect he has a many more
turns on the coil than he is admitting ;-)


--
Brian Reay
www.g8osn.org.uk
www.amateurradiotraining.org.uk
FP#898

Brian Reay wrote:
The explanation is a fairly standard one, although Walt does express it
well. If Walt is the originator of the idea I suspect he has a many more
turns on the coil than he is admitting ;-)

From "Radio Handbook" by Bill Orr, 20th edition, copyright 1975,
section/page 27.9: "The feedpoint impedance of a ground plane may
be raised to about 50 ohms by drooping the radials down at a 45
degree angle." Anyone got an earlier edition?
--
73, Cecil http://www.qsl.net/w5dxp


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