Covering both GPS and GLONASS frequencies,
The high-performance SH2 Series GPS antennas
combine superior performance and low power
consumption. They are designed to survive the
weather with an IP66 rating and UV stabilized
plastic and cable. This makes them ideal for
telematics, fleet management, navigation, tracking
and other applications that require a compact,
high-performance GPS antenna. For maximum
compatibility with the host receiver, the SH2
accepts supply voltages from 2.5 to 5.5VDC and is
protected against shorts, over current, or reverse
polarity situations. The antennas attach via a SMA,
MCX, MMCX or customer-specified connector.
• High-gain, low-noise design
• Low current consumption
• Protection circuit
• UV protection
• IP66 rating
• Rugged & damage-resistant
• Magnetic mount
Center Frequency: 1575.42MHz, 1602MHz
Bandwidth: 10MHz @ –3dB point
VSWR: 1.5 typ.
Antenna Peak Gain: 5.0dB typ.
Axial Ratio: 1.0dB typ.
Elev. Angle Cov.: 5–90 degrees
Az. Bearing Cov.: 360 degrees
System Gain: 28±1dB typ. (includes 3m
cable & filter loss)
Noise Figure: 1.0dB typ.
Input Voltage: +2.5 to +5.5VDC
Current: 5–8mA typ. @ 5V
Mounting: Magnetic and/or screw
What is VSWR?
The Voltage Standing Wave Ratio (VSWR) is a measurement of how well an antenna is matched to a source
impedance, typically 50-ohms. It is calculated by measuring the voltage wave that is headed toward the load
versus the voltage wave that is reflected back from the load. A perfect match has a VSWR of 1:1. The higher
the first number, the worse the match, and the more inefficient the system. Since a perfect match cannot
ever be obtained, some benchmark for performance needs to be set. In the case of antenna VSWR, this
is usually 2:1. At this point, 88.9% of the energy sent to the antenna by the transmitter is radiated into free
space and 11.1% is either reflected back into the source or lost as heat on the structure of the antenna. In
the other direction, 88.9% of the energy recovered by the antenna is transferred into the receiver. As a side
note, since the “:1” is always implied, many data sheets will remove it and just display the first number.
How to Read a VSWR Graph
VSWR is usually displayed graphically versus frequency. The lowest point on the graph is the antenna’s
operational center frequency. In most cases, this is different than the designed center frequency due to
fabrication tolerances. The VSWR at that point denotes how close to 50-ohms the antenna gets. Linx
specifies the recommended bandwidth as the range where the typical antenna VSWR is less than 2:1.
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159 Ort Lane, Merlin, OR 97532
Phone: +1 541 471 6256
Fax: +1 541 471 6251
www.linxtechnologies.com ANT-GPS-SH2-ccc Data Sheet