Precision Supercomponents For Critical Applications FA4489 9 CHANNEL PRESELECTOR ULTRA LOW INTERMODULATION DISTORTION 1 MHZ - 1200 MHZ FEATURES DESCRIPTION • ULTRA LOW INTERMODULATION DISTORTION • 9 CHANNELS • LOW INSERTION LOSS OVER ALL BANDS • LOW AMPLITUDE RIPPLE • SHARP ATTENUATION • FAST SWITCHING SPEED • LOW SWITCHING TRANSIENTS 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. • SMALL SIZE AND LOW WEIGHT • FULL MIL • LOW COST 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 33.4 MHZ 20 MHZ BANDPASS FILTER SET FOR 25 MHZ ADRET MODEL 7100A SIGNAL GENERATOR 10 dB PAD MC-ZSC-2-1 POWER SPLITTER 33.4 MHZ 20 MHZ BANDPASS FILTER SET FOR 30 MHZ 10 dB PAD 55.8 MHZ COMSTRON FA4489 PRESELECTOR 3 dB PAD 10 dB PAD BANDPASS FILTER 93.1 MHZ 3 dB PAD 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 S P 9 T CHANNEL 4 CHANNEL 5 CHANNEL 6 CHANNEL 7 RF OUT CHANNEL 8 CHANNEL 9 DRIVERS DECODER 4 LINE TTL CONTROL INPUT Precision Supercomponents For Critical Applications FA4489 SPECIFICATIONS CHARACTERISTICS INSERTION LOSS ACROSS ALL BANDS PASSBANDS BAND 1 1-20 MHZ BAND 2 20-34 MHZ 3/4 OCTAVE EACH BAND 9 640-1280 MHZ STOPBAND ATTENUATION ULTIMATE ATTENUATION TO 5000 MHZ VSWR ( 50 OHMS ) IN/OUT ALL BANDS TYPICAL 2.0 DB .8 DB .8 DB .8 DB .8 DB 60 DB/OCTAVE 55 DB 1.4:1 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 OUTPUT INTERCEPT POINTS 2 ND ORDER 3 RD ORDER SWITCHING SPEED DC POWER +5V - 15 V WEIGHT MECHANICAL CONFIGURATION + 92 DBM + 47 DBM 6 µSEC +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 COMSTRON Precision Supercomponents For Critical Applications 35 South Service Road Plainview, NY 11803 TEL: 516-694-6700 FAX: 516-694-2562