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Comparing GNSS Antenna Performance
4000 Series White Paper – New Challenges for GNSS Patch Antennas
Tallysman TW4000 Series White Paper
Patch Antennas for the New GNSS (GPS World Article Feb /12)
Multi-constellation GNSS
TW2500 Magnet Mount Globalstar™ Certified STU Antenna
The TW2500 by Tallysman Wireless is a professional grade, magnet mount, passive left hand circularly polarized antenna for the 1610 to 1620 MHz frequency band, certified and specifically designed to maximize the performance of the Globalstar™ STU (Simplex Transmit Unit) Modem.
The TW2500 features a high performance dual-feed patch element that provides great axial ratio (3 dB max) over the entire Globalstar™ frequency band, thus signals at the band edges remain truly circular, unlike the response of single feed antennas.
The TW2500 is housed in a compact, industrial-grade weather-proof, magnet mount enclosure, with threaded base holes for screw down attach. It is available with a 50 cm cable, allowing for the STU modem to be mounted out of the elements and reach, and still providing excellent Globalstar™ signal coverage.
| Applications | Features | Benefits |
|---|---|---|
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Specifications
Vcc = 3V, over full bandwidth, T=25°C
| Antenna | |
|---|---|
| Architecture | Dual, Quadrature Feeds |
| Antenna Gain (100mm ground plane) | 4.25 dBic |
| Axial Ratio (over full bandwidth) | ≤3 dB |
| Electrical | |
|---|---|
| Architecture | Hybrid 90° phase splitter |
| Frequency Bandwidth | 1615 MHz ±10 MHz |
| Polarization | LHCP |
| Gain Flatness | ≤1 dB, from 1610 to 1620 MHz |
| VSWR (at antenna) | <1.5:1 |
| Return Loss (10 dB bandwidth) | <-20MHz |
| ESD Circuit Protection | 15 KV air discharge |
| Mechanicals & Environmental | |
|---|---|
| Mechanical Size | 57 mm dia. x 15 mm H |
| Connectors | SMA, TNC, MCX Male (Plug). Other connectors optional |
| Cable | RG174 / 50 cm, custom lengths optional |
| Operating Temp. Range | -40 to +85 °C |
| Enclosure | Radome: ASA Plastic, Base: Zamak White Metal |
| Weight | 150 g |
| Attachment Method | Magnet or permanent (pre-tapped 4 x 6-32UNC) |
| Environmental | IP67 and RoHS compliant |
| Shock | Vertical axis: 50 G, other axes: 30 G |
| Vibration | 3 axis, sweep = 15 min, 10 to 200 Hz sweep: 3 G |
| Warranty | One year, parts and labour |
| Ordering Information | |
|---|---|
| TW2500 – Globalstar™ STU antenna, 50 cm cable, SMA Male | 32-2500-0 |
| TW2500 – Globalstar™ STU antenna, 50 cm cable, TNC Male | 32-2500-1 |
| TW2500 – Globalstar™ STU antenna, 50 cm cable, MCX Male | 32-2500-2 |
Download TW2500 Datasheet
The information provided herein is intended as a guide only and is subject to change without notice. This document is not to be regarded as a guarantee of performance. Tallysman Wireless Inc. hereby disclaims any or all warranties and liabilities of any kind. © 2010 Tallysman Wireless Inc. All rights reserved.