Re: Could this device be built?
- From: jimp@xxxxxxxxxxxxxxxxxxxx
- Date: Tue, 21 Aug 2007 04:25:04 GMT
In sci.physics JosephKK <joseph_barrett@xxxxxxxxxxxxx> wrote:
jimp@xxxxxxxxxxxxxxxxxxxx jimp@xxxxxxxxxxxxxxxxxxxx posted to
sci.electronics.design:
In sci.physics John Larkin
<jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Sun, 19 Aug 2007 16:05:03 GMT, jimp@xxxxxxxxxxxxxxxxxxxx
wrote:
In sci.physics Arny Krueger <arnyk@xxxxxxxxxx> wrote:
"Ken Weitzel" <kweitzel@xxxxxxx> wrote in message
news:IsPxi.68411$_d2.64084@xxxxxxxxxxxx
I do not know if the tracking
radar and cop's radar gun were on the same band, however I
do know that 1MW of > microwaves was sufficiently
nondiscriminatory at the receiving end to burn out > its
front end.
I bet it was sufficiently nondiscriminatory at the receiving
end to burn out the cop's front end, too.
When people talk about megawatt radars, they are talking
pulse peak powers. Radar pulses are very narrow - less than a
microsecond. However, its peak voltage that usually frys
semiconductors.
If these megawatt-rated radars were not sending out short
pulses, but continuous power, they'd have to build a
commerical electrical generating plant next to them to run
them in the field.
Nike HIPAR, 10.4 MW, pulse width 6 microseconds.
The array radars on the F-22 and JSF are reported to hit
gigawatts peak, and may one day get into the terawatt range. That
would be enough to fry the electronics on any current-generation
missile or plane, and maybe leave tanks and ships dead and
immobile. And make stealth planes un-stealthy at 100 mile ranges.
BAE is developing some of the laser-fired switches that make the
peak power.
John
A gigawatt at what pulse repetition rate; 1 pulse per hour?
It may be near a gigawatt ERP, but I doubt that's watts RF into
the antenna.
I'd also like to know what you'd use for waveguide at those power
levels. It's hard enough to keep moderate megawatts contained and
the waveguide in one piece.
--
Jim Pennino
Remove .spam.sux to reply.
What waveguides? The emitter is a phased array antenna; 300,000
phase synchronized small sources.
OK, so you have 300,000 RF sources closely coupled to 300,000 RF
sources, each running 3.3 kW to get a gigawatt.
Arranged in a square, that's roughly 547 X 547 sources.
At 4 inches per source, that's 2188 inches, or 182 feet by 182 feet.
That's some fighter.
--
Jim Pennino
Remove .spam.sux to reply.
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