Specifications

Applied Concepts, Inc. 855 East Collins Blvd. Richardson, Texas 75081 Toll Free: 1-800-STALKER
Tel: [phone] Fax: [phone] [e-mail] http://www.a-concepts.com
006-0050-00 Rev A
S
®
KA-2M RADIO ASSEMBLY SPECIFICATIONS
KA-2M Radio Assembly
The KA-2M radio assembly consists of an antenna, a turnstile
duplexer/polarization converter, a Gunn diode oscillator and
associated temperature compensated voltage regulator, a passive
quadrature balanced mixer and low noise IF (base band) pre-amps.
The antenna is a round horn radiator with corrective lens that
provides a half-power beam width of 12 degrees and a gain of
+22.6 dBi. The circular polarized transmit and receive signals are
converted to rectangular polarization by a turnstile duplexer which
also provides isolation between the transmit and receive ports to
prevent receiver overload from the high level transmit signal. The
transmit and receive ports are short sections of rectangular WR-28
waveguide that connect respectively to the Gunn oscillator and
quadrature balanced mixer. A high Q waveguide cavity resonator is
the primary frequency-determining element in the Gunn oscillator.
A mechanical ceramic-rod slug tuner is used to set the oscillator
frequency, and to provide temperature compensation to correct
frequency drift due to thermal expansion of the resonator cavity.
The voltage regulator for the Gunn oscillator is also temperature
compensated to reduce variations in power output with temperature
and maintain operation at the peak power point of the Gunn diode.
Frequency stability is 100 MHz from -30 to +70 degrees
centigrade. Nominal power output is 25 milliwatts, and is specified
and tested to be no less than 2 nor greater than 50 milliwatts over
the full frequency and temperature range of the unit. No means is
provided for adjusting power output except for setting the voltage
regulator to the peak power point for the particular Gunn diode
being used. DC power consumption is typically 5.0 volts at 350
mА, and is not adjustable beyond setting the peak power voltage.
The mixer is a passive quadrature balanced mixer using microstrip
techniques. A branch coupler hybrid provides isolation between the
received-signal port and the local oscillator port to prevent
interaction, and provides two outputs with equal amplitudes and
180-degree phase difference to drive the two mixer diodes in each
mixer. The two mixers operate with a 90-degree phase differential
to produce the quadrature output signals required for direction
sensing.
Local oscillator injection of approximately 1 milliwatt is provided
to each mixer by a sampling probe in the waveguide section
connected to the Gunn oscillator, and received signal is obtained
from a waveguide to microstrip transition from the received-signal
waveguide. Since the local oscillator injection is a sample of the
transmitted signal, local oscillator leakage is not a problem. The
demodulated Doppler signals have a bandwidth of 0 to
approximately 20 kHz. These signals are amplified by a pair of low
noise preamplifiers constructed on the same circuit board as the
microstrip mixer.
KA-2M General Specifications
Type: Direction Sensing Moving/Stationary Doppler
Radar
Operating Frequency: 33.4 GHz - 36.0 GHz (Ka-Band)
Stability:
±100 MHz (Ka-Band)
Gunn Input Voltage: 5.0 to 7.5 VDC
Gunn Current (+6.0VDC): 0.350 A (Gunn on)
0.01 A (Gunn off)
Mixer Supply Voltage: +/- 5VDC
Mixer Supply current: +/-3.6mA
Environmental: -30° C to +70° C, 90% Relative Humidity Operating
-40° C to +85° C, non-operating
Mechanical: Weight: 0.34 kg (0.75 lbs.)
Size: 66.02 mm Dia. X 84.6 mm Length
(2.60" Dia. X 3.33" Length)
KA-2M Microwave Specifications
Antenna: Conical horn with corrective lens
Polarization: Circular
3 db Beam Width:
12° ±1º
Microwave Source: Gunn-Effect diode
Receiver Type: Two Direct Conversion Homodyne receivers using
four low-noise Schottky barrier mixer diodes
Power Output: 10 mW minimum, 25 mW nominal, and 50 mW
maximum
Power Density:
2 mW/cm
2
maximum at 5 cm from lens
FCC Rules
This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) This device may not
cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause
undesired operation.
Changes or modifications not expressly approved by the party
responsible for compliance could void the user's authority to
operate the equipment.
Warning RF Exposure Compliance
The antenna(s) used for this transmitter must be installed to provide
a separation distance of at least 40 cm from the human body. Users
and installers must be provided with antenna installation and
transmitter operating conditions for satisfying RF exposure
compliance.