Filtered Low Noise Amplifier SPECTRUM MICROWAVE P/N: 310-025103-012 For GPS Applications 1227 MHz/1575 MHz This series of Low Noise Amplifiers provides a filtered, low-noise gain solution ideal for applications where higher reliability is critical. These filtered low noise amplifiers are designed to reduce out-of-band interference while achieving high dynamic range. A pair of diplexed 3-pole ceramic filters select only the desired GPS signals while the low-noise gain stage maintains the receiving system’s sensitivity. The LNA rejects undesired signals by at least 40 dB at 1050, 1410, and 1710 MHz. See the graphs on Page 2 for return loss, rejections, and gain of a typical unit. The preamplifier is powered by DC voltage applied to the center conductor of the output connector. Optionally, the unit can be powered through an external DC bias connector. Features and Benefits Noise figure 1.6 dB typical Double-diplexed preamp filters Lightweight aluminum housing Dual band (L1 and L2) performance Coaxial and external bias options Environmental sealing available Application specific packages available Suitable for new L2-C signals L5 configurations available upon request P/N: 310-025103-012 Typical Performance Specifications Frequency. . . . . . . . . . . . . 1575.42 MHz (L1) 1227.60 MHz (L2) Bandwidth . . . . . . . . . . . . 30 MHz min. Noise figure . . . . . . . . . . . 2.5 dB max. VSWR . . . . . . . . . . . . . . . 1.5:1 max. Gain . . . . . . . . . . . . . . . . 14 dB min. Gain Flatness . . . . . . . . . . +/-0.5 dB Rejection . . . . . . . . . . . . . 40 dB @ 1050, 1410, 1710 MHz Bias . . . . . . . . . . . . . . . . . Coaxial Bias DC Power . . . . . . . . . . . . 16-32 VDC Temperature Range. . . . . . -40˚C to +71˚C All specifications above measured at 25˚C Dimensions and Connections Antenna port J1 Receiver port J2 SMA type female connectors 2.20"ø x 0.080"H excluding connectors Chassis is machined aluminum with a nickel plate finish. Block Diagram CERTIFIED SPECTRUM MICROWAVE • 38166 Old Stage Road • Delmar, Delaware 19940 • Phone: 302-846-2750 • Fax: 302-846-3888 SPECTRUM MICROWAVE • 2707 Black Lake Place • Philadelphia, Pennsylvania 19154 • Phone: 215-464-4000 • Fax: 215-464-4001 www.SpectrumMicrowave.com Filtered Low Noise Amplifier 1227 MHz/1575 MHz Return Loss Amplifier Gain 15 0 2 Loss in dB Gain in dB DB(|S[1,1]|) -11 -10 -20 DB(|S[2,2]|) DB(|S[2,1]|) -24 1051 1251 1451 1651 -30 1051 1751 1251 Frequency (MHz) Dimensions 1651 1751 (inches) 1.00 4X ø .17 thru ø2.72 2X SMA Female Connector 1.79 .51 1451 Frequency (MHz) 1.36 J2 2.15 J1 .51 2.20 .80 SPECTRUM MICROWAVE • 38166 Old Stage Road • Delmar, Delaware 19940 • Phone: 302-846-2750 • Fax: 302-846-3888 SPECTRUM MICROWAVE • 2707 Black Lake Place • Philadelphia, Pennsylvania 19154 • Phone: 215-464-4000 • Fax: 215-464-4001 www.SpectrumMicrowave.com