NJT1969 X-Band Radar Front End NJT1969 is designed for the front end of marine radar system. It features a small size and a light weight operable at any frequency between 9.38GHz and 9.44GHz. This front end module consists of HEMT low noise amplifier, Image rejection mixer, Local VCO with buffer amplifier. A HEMT monitoring circuit is included in the design to monitor HEMT drain current. The stability of the local VCO frequency by the input RF power is increased effectively by the buffer amplifier which is located between image rejection mixer and local VCO. -- ELECTRICAL -- < at 25 degree > Min Typical Max Unit Operating voltage 4.8 5.0 5.2 V Operating current - 70 100 mA VT= 6V - - 9.41 GHz VT=24V 9.53 - - GHz - 2.5 3.5 dB Conversion gain 4.0 6.5 8.0 dB Monitor voltage 30 50 70 mV RF single pulse burnout(Note1) - - 600 mW RF repetitive pulse burnout(Note2) - - 400 mW Local frequency Noise figure Note1: f=9.41GHz, Pd=10nsec Note2: f=9.41GHz, Pd=1µsec, Duty=0.001 -- BLOCK DIAGRAM -+5V Balanced Mixer WG-MIC Transition LNA 0deg 0deg TUNE (+6 to +24V) Buffer Amplifier IF OUT RF IN Divider 90deg Monitor Circuit 0deg Balanced Mixer Lo.VCO IF Combiner MONITOR OUT For further information on the use of the front end, please contact New JRC. New JRC reserves the right to change the specification of goods without notice. 03-3