Stalker ATR
Applied Concepts
CPL Approved.
OPERATION
- Hand-held Ka band Radar Gun
optional mounting bracket
powered by internal (in handle) or car battery
- Ka band
wideband mode -- frequency hops between 34.2 - 35.2 GHz (5 channels)
single channel -- one of several fixed frequencies (between 34.2 - 35.2 GHz)
early models used a fixed frequency of 34.70 GHz or 34.94 GHz (others probable)
- Instant On or continuous
- operates from a stationary position only
(moving mode upgrade available)
- measures on-coming traffic only
- Audio proportional to target Doppler
- Manual-lock (Speed), separarate display
- comes with tuning fork calibrated for 40 mph.
CONTROLS
- Instant On
TRIGGER -- TRANSMITS when pressed, STANDBY when released / locks target speed
- Manual-lock Target Speed
LOCK -- lock / release target display
TRIGGER -- transmit (from hold mode), lock display (if transmitting)
- Audio Squelch -- squelch target audio tone (SQ)
- Speaker Volume -- audio Doppler (UP or DOWN arrow)
- Self-test (on power-up and TEST)
-- crystal accuracy and transmit frequency
-- processing circuits
- Backlight (on/off) switch for LCD (light symbol)
- Range Control (UP or DOWN arrow on power-up only)
- Power On/Off (PWR)
DISPLAYS / INDICATORS
mph or kmh (depends on software loaded)
- Display (LCD) -- Target Speed
Speed Measuring Range: 1 to 150 mph (01 to 270 kmh)
- Display (LCD) -- Locked (target) Speed
Displays last locked speed while displaying current target in target speed display.
- Speaker (audio tone proportional to target Doppler)
- display indicators
XMIT-- unit transmitting
JAM -- Radio Frequency Interference present, operation inhibited
LOCK -- speed display locked
BAT -- internal battery low
TEST-- self test running (operated initiated)
OK -- unit passes battery and built-in-test
FAIL-- unit fails battery or built-in-test
Speaker Volume Indicator
SPECIFICATIONS
ACCURACY +/- 1 mph (+/- 1 kmh)
MEASURING RANGE 1 to 150 mph (1 to 270 kmh)
FREQUENCY Ka band
wideband 34.2 to 35.2 GHz (covers 5 channels)
fixed 34.7 GHz (+/-100 MHz)
34.94 GHz (+/-100 MHz)
others?
TRANSMIT POWER 20 mW (minimum)
50 mW (nominal)
100 mW (maximum)
power density 4 mW/sq cm, 5 inches from lens
ANTENNA dual rectangular horns (top/bottom)
beamwidth 9 degrees nominal
polarization vertical
POWER SOURCE Internal battery (in handle)
6.6 to 9.0 Vdc (1.5 or 1.8 amp-hour)
(1.0 A transmit, 0.04 A standby)
1.5 A-hr battery good for 4 to 12 hours
patrol car battery (9 to 16 Vdc)
typically 0.55 A at 13.8 Vdc (transmit)
ENVIRONMENTAL
operating -30 to 50 degrees Celsius
(-22 to 122 degrees Fahrenheit)
90 percent humidity
non-operating -40 to 70 degrees Celsius
(-40 to 158 degrees Fahrenheit)
PHYSICAL height 9.25 in, includes handle
length 10.2 in
width 3.5 in
WEIGHT 3 lb, 3 oz, includes handle
MICROWAVE SOURCE Gunn-effect diode
RECEIVER TYPE Direct Conversion Homodyne
(low-noise Schottky barrier mixer diode)
CopRadar.com
Police Traffic Speed Radar Handbook
Radar Specifications