beam width of police radar
Brent Besler
Bell labs, posted the specs on the common K,X, and the Ka photo radars. I
seem to remember the beam width of the X band is about 22 degrees and the K
band about 15 degrees. This is opposed to about 0.22 for the laser beam
system.
Brent H. Besler
fred.j.shubert
> I wish I had the spec sheet still, but a number of months ago Frank Shubert of
> Bell labs, posted the specs on the common K,X, and the Ka photo radars. I
Close, it's Fred Shubert, but at least the affiliation is correct. Let me
know if ya's need any more info........
--------------------- cut here ----------------------------------------------
I wish to contribute to the net some specifications on the MPH Industries
K-55 radar unit. It is the present industry [police] standard unit:
UNIT
OPERATING SPEED: Patrol- 20MPH to 55MPH
(above 55/below 20 available on request)
TARGET SPEED: 20MPH minimum to maximum 209MPH closing speed
20MPH to 100MPH while patrol is stationary
SPEED VALIDATION: target speed 50MPH: 100 comparisons in 1/8 sec.
target speed 70MPH: 140 comparisons in 1/8 sec.
RFI PROTECTION: when excessive RFI is present, no readings will be
displayed
CALIBRATION ADJ: NONE- fixed
TIME BASE: Crystal oscillator +- 5 %
LOCK TIME: Instantaneous [no comments, please. This is in the
official spec :-) ]
ACCURACY: +- 1MPH Absolute
ANTENNA
ANTENNA TYPE: Circularly polarized conical horn
OPERATING FREQ: X-Band: 10.525 GHz +-21.05MHz
K-Band: 24.150 GHz +-48.3MHz
OUTPUT POWER X-Band: Nominal 13-30mW Maximum 50mW
K-Band: Nominal 12-50mW Maximum 95mW
RADIATED PWR DEN: < 1mW/cm^2 @ 5cm (in accordance with microwave oven stds.)
BEAM WIDTH: X-Band: maximum 18 degrees
K-Band: maximum 15 degrees
SIDE LOBES: 24dB down from main beam
RANGE: 2500 feet for avg vehicle size. Range varies by size of
vehicle, terrain, weather.
AND THE EVER POPULAR Ka-BAND RADAR UNIT
(made by Zellwager Uster AG [Switzerland] for Traffic Monitering Technologies
of Friendswood Texas)
UNIT
MEASURING DIRECTION: Oncoming traffic
MEASURING RANGE: 15MPH to 155MPH
MEASURING ACCURACY: <= 100MPH +- 1MPH
> 100MPH +- 1%
ELECTRONIC FLASH: 170W/340W
RECHARGE TIME: 170W 0.9 sec.
340W 1.8 sec.
ANTENNA
TRANSMIT FREQUENCY: 34.3 GHz +- 100MHz
TRANSMITTED POWER: 0.5mW MAXIMUM
TYPE OF ANTENNA: parabolic reflector
HALF-PWR BEAM WIDTH: 5 degrees horizontal
5 degrees verticle
SECONDARY LOBE ATTEN: > 20dB
MEASURING ANGLE TO
DIRECTION OF TRAVEL: 22 degrees
RANGE: Designed for 50 feet with downward transmission
@ 22 +- 3 degrees beam width. Beam makes 5 degree
angle with ground at 50 feet.
---------------------- cut here ----------------------------------------------
BTW, with respect to radar jamming, I've got a few ideas that might be
worth tossing about:
Conventional Radar -- 1) A relatively large neon tube mounted in the
front grille, ie. massive RF source
2) Change spark-plug wires to solid copper.
(Car radio will be useless and must use
colder plug, but again, massive RF source.)
Laser Radar -- 1) IF this 900nm laser IS TRUELY SAFE FOR HUMAN
EXPOSURE (repeat this to yourself 4 or 5 times
before flaming me), mount equivelant "jamming"
diodes in a pair of gutted high-beams. Hidden.
Activated by high-beam switch. Difficult to
detect if stopped. (also reduces high-beam
flashing, a great topic on rec.autos)
These might sound stupid, but aren't all jamming discussions aiming that
way ? :-) AKA, as Radio-Electronics puts it, "radar jamming is illegal.
This article solely for experimental/educational uses only".
Regards,
Fred
Fred J. Shubert | "You haven't lived until you've seen a 'cat fly!!!"
AT&T Bell Labs |-----------------------------------------------------
Whippany, N.J. | DISCLAIMER: All views are that of my own. PERIOD.
Ma-Bell 201-386-3094 | Who else could be so 'cat crazy!!
| _ |
| /^ ^\ | F-14D
____________|_( . )_|____________ SUPERTOMCATS
--*/--|_| (___) |_|--\*-- RULE
* O O * (I Love 'Em)
Let's turn and burn!!
charles.a.sherwood
> Bell labs, posted the specs on the common K,X, and the Ka photo radars. I
Well I saved it. Here is Franks orginal article:
With all the talk on police radar, some facts might help:
I wish to contribute to the net some specifications on the MPH Industries
K-55 radar unit. It is the present industry [police] standard unit:
UNIT
OPERATING SPEED: Patrol- 20MPH to 55MPH
(above 55/below 20 available on request)
TARGET SPEED: 20MPH minimum to maximum 209MPH closing speed
20MPH to 100MPH while patrol is stationary
SPEED VALIDATION: target speed 50MPH: 100 comparisons in 1/8 sec.
target speed 70MPH: 140 comparisons in 1/8 sec.
RFI PROTECTION: when excessive RFI is present, no readings will be
displayed
CALIBRATION ADJ: NONE- fixed
TIME BASE: Crystal oscillator +- 5 %
LOCK TIME: Instantaneous
ACCURACY: +- 1MPH Absolute
ANTENNA
UNIT
MEASURING DIRECTION: Oncoming traffic
ANTENNA
TRANSMITTED POWER: 0.5mW MAXIMUM
SECONDARY LOBE ATTEN: > 20dB
------------------------------------------------------------------------------
Fred J. Shubert | "You haven't lived until you've seen a 'cat fly!!!"
AT&T Bell Labs |-----------------------------------------------------
Whippany, N.J. | DISCLAIMER: All views are that of my own. PERIOD.
Ma-Bell 201-386-3094 | Who else could be so 'cat crazy!!
------------------------------------------------------------------------------
chuck sherwood