ANT-GPS-SH2-ccc Data Sheet Product Description Side 12.5 mm Covering both GPS and GLONASS frequencies, (0.49 ) The high-performance SH2 Series GPS antennas combine superior performance and low power consumption. They are designed to survive the 45.0 mm weather with an IP66 rating and UV stabilized (1.77 ) plastic and cable. This makes them ideal for telematics, fleet management, navigation, tracking and other applications that require a compact, Top 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, 36.6 mm (1.44 ) MCX, MMCX or customer-specified connector. 10.6 mm Features (0.42 ) Compact Bottom 36.5 mm High-gain, low-noise design (1.44 ) Low current consumption Protection circuit 11.0 mm UV protection (0.43 ) 6.9 mm IP66 rating M2.6x0.45 Threads (0.27 ) 3.0 mm (0.12) Rugged & damage-resistant Deep Magnetic mount Electrical Specifications Center Frequency: 1575.42MHz, 1602MHz Cable: 117 +/6 (3m) RG-174U Bandwidth: 10MHz 3dB point (Low-loss, 0.7dB/m) 1 VSWR: 1.5 typ. Connection: SMA, MCX, MMCX Antenna Peak Gain: 5.0dB typ. Weight: 2.79oz (79g) Impedance: 50-ohms Plastic UV Resistance: UL-746C f1 Axial Ratio: 1.0dB typ. Cable UV Resistance: UL-758 Elev. Angle Cov.: 590 degrees Ingress Protection: IP66 2 Az. Bearing Cov.: 360 degrees Oper. Temp. Range: 40C to +85C Polarization: RHCP System Gain: 281dB typ. (includes 3m Ordering Information ANT-GPS-SH2-SMA (with SMA connector) cable & filter loss) ANT-GPS-SH2-MCX (with MCX connector) Noise Figure: 1.0dB typ. ANT-GPS-SH2-MMX (with MMCX connector) Input Voltage: +2.5 to +5.5VDC Current: 58mA typ. 5V 1 Contact Linx for custom cable lengths and connectors. 2 Operation below 30C may result in a slightly longer time to Mounting: Magnetic and/or screw first fix. 1 Revised 4/11/2018VSWR Graph VSWR 1.277 Reflected Power 25% 3:1 11% 2:1 0% 1:1 1475.00MHz 1575.00MHz 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, 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 antennas 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. 2 ANT-GPS-SH2-ccc Data Sheet