FA4489

Precision Supercomponents For Critical Applications FA4489 9 CHANNEL PRESELECTOR ULTRA LOW INTERMODULATION DISTORTION 1 MHZ - 1200 MHZ FEATURES • • • • • • • • • • ULTRA LOW INTERMODULATION DISTORTION 9 CHANNELS LOW INSERTION LOSS OVER ALL BANDS LOW AMPLITUDE RIPPLE SHARP ATTENUATION FAST SWITCHING SPEED LOW SWITCHING TRANSIENTS SMALL SIZE AND LOW WEIGHT FULL MIL LOW COST DESCRIPTION The Comstron Model FA4489 is a switchable filter module with the capability of selecting any one of nine channels with a four TTL control signal. This device is used as the front-end preselector in a high dynamic range receiver. The filter module introduces very low intermodulation distortion along with low insertion loss - a necessary requirement for excellent receiver performance. ULTRA LOW INTERMODULATION DISTORTION Comstron has developed a proprietary switching matrix that spans 1 MHz to 1200 MHz (more than 3 decades wide) along with introducing low intermodulation distortion and low signal loss. The pin diodes utilized in the SP9T switch are optimum for high- lifetime carrier, low junction capacitance and low series resistance and help produce second and third order output intercept points (IP2 and IP3) of 90 dBm and 45 dBm respectively. FA4489 FA4489 90 dBm Level ADRET MODEL 7100A SIGNAL GENERATOR SET FOR 25 MHZ 20 MHZ 33.4 MHZ BANDPASS FILTER 20 MHZ 33.4 MHZ 10 dB PAD 3 dB PAD MC-ZSC-2-1 POWER SPLITTER ADRET MODEL 7100A SIGNAL GENERATOR SET FOR 30 MHZ BANDPASS FILTER 10 dB PAD 3 dB PAD 55.8 MHZ 93.1 MHZ COMSTRON FA4489 PRESELECTOR 10 dB PAD BANDPASS FILTER HP8568A SPECTRUM ANALYZER RES.BW=10HZ VIDEO BW=3HZ RF ATT=30dB SPAN=100HZ IP2 TEST SETUP FOR CHANNEL 2 AND 3 PERFORMANCE FA4489 9 CHANNELS WITH SHARP ATTENUATION Each of the 9 channel filters is composed of 12 pole pseudo-elliptic function lumped component (lc) elements. These elements are optimized to provide the highest amount of attenuation for the given package size. The filters provide a minimum of 60 dB/octave and provide an ultimate attenuation of 50 dB minimum to 5000 MHz. FUNCTIONAL BLOCK DIAGRAM CHANNEL 1 CHANNEL 2 RF IN S P 9 T CHANNEL 3 CHANNEL 4 CHANNEL 5 CHANNEL 6 CHANNEL 7 CHANNEL 8 CHANNEL 9 S P 9 T RF OUT DRIVERS DECODER 4 LINE TTL CONTROL INPUT Precision Supercomponents For Critical Applications FA4489 SPECIFICATIONS CHARACTERISTICS INSERTION LOSS ACROSS ALL BANDS PASSBANDS BAND 1 BAND 2 BAND 9 STOPBAND ATTENUATION ULTIMATE ATTENUATION TO 5000 MHZ VSWR ( 50 OHMS ) IN/OUT ALL BANDS OUTPUT INTERCEPT POINTS 2 ND ORDER 3 RD ORDER SWITCHING SPEED DC POWER WEIGHT MECHANICAL CONFIGURATION +5V - 15 V 1-20 MHZ 20-34 MHZ 640-1280 MHZ 3/4 OCTAVE EACH TYPICAL 2.0 DB .8 DB .8 DB .8 DB .8 DB 60 DB/OCTAVE 55 DB 1.4:1 + 92 DBM + 47 DBM 6 µSEC LIMITS 3.0 DB 1.0 DB MAX 1.0 DB MAX 1.0 DB MAX 1.0 DB MAX 50 DB/OCTAVE MIN 50 DB MIN 1.5:1 MAX +90 DBM MIN +45 DBM MIN 10 µSEC MAX 140 MA MAX 100 MA MAX 14 OUNCES EDGE CONNECTORS WITH GPO RF IN/OUT OUTLINE DRAWING COMS R T ON Precision Supercomponents For Critical Applications 35 South Service Road Plainview, NY 11803 TEL: 516-694-6700 FAX: 516-694-2562