Stalker ATR
Applied Concepts

CPL Approved.

• 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)