025107-022.pdf

Filtered
Low Noise Amplifier
SPECTRUM MICROWAVE
P/N: 310-025107-022
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: 310-025107-022
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 . . . . . . . . . . . . . . . . 34 dB min.
Gain Flatness . . . . . . . . . . +/-0.5 dB
Rejection . . . . . . . . . . . . . 40 dB @ 1050, 1410, 1710 MHz
Bias . . . . . . . . . . . . . . . . . Ext Bias, MR01
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
35
0
15
Loss in dB
Gain in dB
DB(|S[1,1]|)
-5
-10
-20
DB(|S[2,2]|)
DB(|S[2,1]|)
-25
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
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