Technical Information Rev.1 NJT1946A X-Band Radar Front End NJT1946A is designed for the front end of marine radar system. It features a small size and a light weight operable at any frequency between 9.345GHz and 9.475GHz. 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 ºC > Min 4.8 － 10.5 － 9.560 － 4.0 -10.0 － － Operating voltage Operating current Tuning Voltage (Note1) Local frequency VT= 4V VT=24V Noise figure Conversion gain 1dB Gain compression point(RF Port) RF single pulse burnout (Note2) RF repetitive pulse burnout (Note3) Typical 5.0 70 12.0 － － 2.5 6.0 -8.0 － － Max 5.2 90 13.5 9.380 － 3.5 8.0 － 600 400 Unit V mA V GHz GHz dB dB dBm mW mW Note1: fLO=9.470GHz Note2: fRF=9.410GHz, Pd=10nsec Note3: fRF=9.410GHz, Pd=1µsec, Duty=0.001 － BLOCK DIAGRAM － Balanced Mixer WG-MIC Transition LNA 0deg 0deg TUNE Buffer Amplifier IF OUT RF IN Divider 90deg Monitor Circuit 0deg Lo.VCO Balanced Mixer 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. 1-1,Fukuoka 2-chome, Fujimino-city Saitama prefecture. 356-8510 Japan 11.08 Phone:049-278-1297 Fax :049-278-1419 Technical Information Rev.1 1-1,Fukuoka 2-chome, Fujimino-city Saitama prefecture. 356-8510 Japan Phone:049-278-1297 Fax :049-278-1419