ANT-GPS-SH2-ccc

Data Sheet
Product Description

Side

12.5 mm(0.49")

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 theweather with an IP66 rating and UV stabilized
plastic and cable. This makes them ideal fortelematics, fleet management, navigation, trackingand 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 isprotected against shorts, over current, or reverse
polarity situations. The antennas attach via a SMA,
MCX, MMCX or customer-specified connector.

45.0 mm(1.77")

Top

36.6 mm(1.44")
10.6 mm(0.42")

Features
••
•
••
•
•
•

Compact
High-gain, low-noise design
Low current consumption
Protection circuit
UV protection
IP66 rating
Rugged & damage-resistant
Magnetic mount

Bottom36.5 mm(1.44")

11.0 mm(0.43")
6.9 mm M2.6x0.45 Threads(0.27")
3.0 mm (0.12”)
Deep

Electrical Specifications
Center Frequency:
Bandwidth:		
VSWR: 			Antenna Peak Gain:
Impedance:		
Axial Ratio:		
Elev. Angle Cov.:		
Az. Bearing Cov.:
Polarization:		
System Gain:					Noise Figure:		
Input Voltage:		
Current:			
Mounting:		

Cable:			
117” +/–6” (3m) RG-174U			(Low-loss, 0.7dB/m)
Connection:		
SMA, MCX, MMCX 1
Weight:			2.79oz (79g)
Plastic UV Resistance: UL-746C f1
Cable UV Resistance: UL-758
Ingress Protection:
IP66
Oper. Temp. Range:–40°C to +85°C 2

1575.42MHz, 1602MHz
10MHz @ –3dB point
1.5 typ.
5.0dB typ.
50-ohms
1.0dB typ.
5–90 degrees
360 degrees
RHCP28±1dB typ. (includes 3mcable & filter loss)
1.0dB typ.
+2.5 to +5.5VDC
5–8mA typ. @ 5V
Magnetic and/or screw

Ordering Information

ANT-GPS-SH2-SMA (with SMA connector)
ANT-GPS-SH2-MCX (with MCX connector)
ANT-GPS-SH2-MMX (with MMCX connector)
12–1–Contact Linx for custom cable lengths and connectors.
Operation below –30°C may result in a slightly longer time tofirst fix.

Revised 4/11/2018

VSWR Graph
VSWR
3:1

1.277

11%

2:1

1:1
1475.00MHz

Reflected Power
25%

1575.00MHz

0%1675.00MHz

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, thisis usually 2:1. At this point, 88.9% of the energy sent to the antenna by the transmitter is radiated into freespace and 11.1% is either reflected back into the source or lost as heat on the structure of the antenna. Inthe 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’soperational center frequency. In most cases, this is different than the designed center frequency due tofabrication tolerances. The VSWR at that point denotes how close to 50-ohms the antenna gets. Linxspecifies the recommended bandwidth as the range where the typical antenna VSWR is less than 2:1.

–2–ANT-GPS-SH2-ccc Data Sheet

Gain Plots

E / Vertical Gain
H / Horizontal Gain
Total Gain
048
46

30.00

2425.00

44

620.00
15.00

428

10.00
40

10

5.00
0.00

1238

-5.00

1436

34

1632

1830

2028

2226

24

XZ-Plane GainZYX

About Gain Plots
The true measure of the effectiveness of an antenna in any given application is determined by the gain
and radiation pattern measurement. For antennas gain is typically measured relative to a perfect (isotropic)
radiator having the same source power as the antenna under test, the units of gain in this case will bedecibels isotropic (dBi). The radiation pattern is a graphical representation of signal strength measured atfixed distance from the antenna.
Gain when applied to antennas is a measure of how the antenna radiates and focuses energy into freespace. Much like a flashlight focuses light from a bulb in a specific direction, antennas focus RF energy intospecific directions. Gain in this sense refers to an increase in energy in one direction over others.
It should also be understood that gain is not “free”, gain above 0dBi in one
direction means that there must be less gain in another direction. Pictoriallythis can be pictured as shown in the figures to the right. The orange patternrepresents the radiation pattern for a perfect dipole antenna, which is shaped
like a donut. The pattern for an omnidirectional antenna with gain is shown inblue. The gain antenna is able to work with a device located further from thecenter along the axis of the pattern, but not with devices closer to thecenter when they are off the axis – the donut has been squished.
Gain is also related to the overall physical size of the antenna, as well assurrounding materials. As the geometry of the antenna is reduced below the effective wavelength (considered
an electrically small antenna) the gain decreases. Also, the relative distance between an electrically small
antenna and its associated ground impacts antenna gain.
Copyright © 2018 Linx Technologies
159 Ort Lane, Merlin, OR 97532
Phone: +1 541 471 6256
Fax: +1 541 471 6251
www.linxtechnologies.com–3–

ANT-GPS-SH2-ccc Data Sheet