ANT-418-WRT-RPS LINX | Alldatasheet
Document overview
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- PDF pages: 2
Technical content
Features
- Low cost
- Unobtrusive
- Tamper resistant
- Integral counterpoise
- Indoor / outdoor
- Adhesive or permanent mount Electrical Specifications Center Frequency: 418MHz Recom. Freq. Range: 409–426MHz VSWR: ≤ 1.9 typical at center Peak Gain: –1.3dBi Impedance: 50-ohms Oper. Temp. Range: –30° to +90°C Max. Recom. Torque: 4.0 kgf-cm Electrical specifications and plots measured on 10.16 cm x 10.16 cm (4.00” x 4.00”) reference ground plane ANT-418-WRT-xxx Data Sheet by
Ordering Information
ANT-418-WRT-RPS (with RP-SMA connector) ANT-418-WRT-SMA (with SMA connector) 19.0 mm (0.75") RG-174 Cable Length 216.0 mm (8.50”) 5.26 mm (0.207") 27.0 mm (1.06") 6.0 mm (0.24") 83.8 mm (3.30") M11x1.0 mm Thread Adhesive Ring Remove protective plastic before installation
– 2 – by Data Sheet ANT-418-WRT-xxx VSWR Graph 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 will have 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 will be 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. VSWR Reflected Power 3:1 2:1 1:1 25% 11% 418MHz 468MHz368MHz 1.469