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In sci.physics Arny Krueger wrote:

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In sci.physics Arny Krueger wrote:

"Ken Weitzel" wrote in message
news:IsPxi.68411$_d2.64084@pd7urf3no...

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.

10.4 * 10**6 * 6 * 10**-6 = 62.4 watts average power.

Hawk 2nd generation tracking HPIR CW RADAR AN/MPQ 39 power seems to have
not yet been revealed publicly. It has been publicly stated that the
AN/MPQ
39 power output level exceeded that of the earlier AN/MPQ 33, which was
125
watts. This is a vast understatement!

You forgot to allow for the PRT.

Which was?

The HIPAR average power was 26 kW.

Then it was a whole 'nuther thing compared the pulse ack that was part of
the Hawk system I worked on.

The LOPAR was 1 MW peak, 1.3 microseconds pulse width, 650 W average.

The Hawk was OK when it worked instead of digging trenches while
chasing jack rabbits around McGreggor Range.

Admittedly, not a lot of techs could keep the Hawk CW equipment working
reliably. Many stuggled to get through their one week a month.

I heard the latest generation of Hawk doesn't do that.

For openers, the Improved Hawk, which was still on the horizon when I ETS'd
out, was finally solid state. The biggest detriments to the Hawk I worked
on were the 100's of tubes ( about 400 in one HIPIR), and the fact that
everything was Doppler which means broadband audio (30-30KHz). MTBF was
about day, but only on a good day. Some subsytems were DC-coupled. There
were zillions of adjustments and many had to be done several times a day.

We had two pulse radars on site, and they almost fixed and ran themselves in
comparison to the Doppler sets.

At this point the whole Hawk fire control system can sit on the tailgate of
a HumVee, has over twice the range, runs almost forever without
maintenance, and can track zillions of targets concurrently. It is
Doppler-pulse.