"Bob Miller" wrote in message
...
On Sat, 09 Apr 2005 20:43:41 GMT, Walter Maxwell wrote:

On Sat, 09 Apr 2005 10:55:11 -0500, Cecil Moore wrote:

H. Adam Stevens, NQ5H wrote:
but any increase in the 1.5:1 SWR bandwidth is due to loss as Walt
proved
decades ago.

If you want a really broad-banded Bazooka, use RG-174. :-)
Advantages: light weight for easy back-packing, no tuner
required, inexpensive coax, ... Hey, maybe I should keep
it secret until I market it for $100.
Egad, Cecil! It's evident I wasn't too bright years ago when I showed why
the
bazooka gets its meager increase in BW from resistive loss, not reactance
cancellation. My scamming genes hadn't developed to the point where I even
thought of marketing it instead of panning it. As you said, Cecil, with
the
higher loss available using RG-174 vs RG-17, think of how rich we could
have
become if we'd let the morons continue to believe what a great antenna it
is,
and sold em with 174.

Walt, W2DU

There's a Double Bazooka currently on eBay for the "Buy it Now" price
of only $60.

Part of the sales pitch is:

"The Double Bazooka antenna was designed and developed by the M.I.T
staff in the 1940's as a radar recieving antenna. Its design was
modified for the hf amateur radio bands."

There's one born every minute...

bob
k5qwg




Hi Bob
Actually that is historically correct about MIT and RADAR.
But the SWR reduction is where the reflected power is so low it doesn't
matter.
And you pay dearly for it in signal strength.
As soon as you move far enough from resonance (dipole SWR 1.2:1 or so) such
that the parallel-resonant network ("tank circuit") quits oscillating at the
DRIVEN frequency, the whole thing falls apart.
And they're a pain-in-the-ass to built "just right", errors of 1/4 inch are
bad news on 40 meters.
I know; Took seven tries to make two that resonated just right on 40.
On 160 the loss was such that I never got it to "ring".
I posted all the data here some time ago.
Walt once accused me of having "zeal" for taking data; I'm an experimental
physicist.
http://www.hep.utexas.edu/mayamuon/
Like I said, build a good dipole carefully.
There is no free lunch.
73
H.