A Tallysman Accutenna®
TW1500 Dual Feed Embedded Globalstar™ Antenna Applications
•Higher success rates for Globalstar™ STU transmissions
•Sea & Land Container Tracking
•Military & Security
•Fleet Management & Asset Tracking
•Marine & Avionics Systems
•Law Enforcement & Public Safety
Features
•dual-feed, wide band  patch  •Axial ratio, 3 dB over full bandwidth •High gain 4.25 dBi
•15 KV ESD circuit protection •Robust design
•Small form factor
•-40o C to +85 o C Operation Benefits
•Better axial ratio at lower elevation angles •Higher transmission success rates •Compact form factor
•RoHS compliant
The TW1500 employs Tallysman’s unique Accutenna technology in a low cost OEM dual feed, passive Left Hand Circularly Polarised antenna (LHCP) for the 1610 to 1620 MHz frequency band, specifically designed to maximise the performance of the Globalsta r™ STU (Simplex Transmit Unit) modems.
The wideband dual feed patch element in the TW1500 has an excellent axial ratio across the entire Globalstar™
bandwidth. Unlike single feed antennas, the TW1500 provides excellent multipath rejection and a truly circular transmission response across the Globalstar™ band.
The TW1500 includes a built-in 35mm circular ground plane but best performance is obtained with thi
s augmented with    a local system ground plane or reflecting surface (DC connection not required).
OEM antennas are easily detuned by the local environment. Tallysman offers custom tuning services for optimized integration into OEM end-user modules. TW1500 Dimensions (mm)
TW1500 Dual Feed Embedded Globalstar® Antenna Specifications
Over full bandwidth, T=25°C
Antenna
Architecture  Dual, quadrature feeds
Antenna Gain (100mm ground plane)    4.25dBic
Axial Ratio (over full bandwidth) ≤3dB
1.0 dB Bandwidth 1600MHz to 1630MHz
Electrical
polarisedArchitecture Dual Feed Patch -> Hybrid 90° Combiner
Polarization LHCP
VSWR (at antenna) <1.5:1 typ.  1.8:1 max.
Return Loss (-10 dB bandwidth) <-20MHz
ESD Circuit protection  15KV air discharge
Mechanicals & Environmental
Mechanical Size 35mm dia. x 7.25mm
Cable    1.38mm OD, 15cm. Custom lengths optional
Operating Temp. Range -40°C to +85°C
Weight 30g
Attachment Method Adhesive or M2 screw mount
Environmental  RoHS compliant
Shock Vertical axis: 50G, other axes: 30G
Vibration    3 axis, sweep = 15 min, 10 to 200Hz sweep: 3G
Warranty One year – parts and labour
Ordering Information
TW1500 – OEM Dual Feed Globalstar antenna, 33-1500-xx-yyyy
Where xx = connector type and yyyy = cable length in mm
Please refer to the Ordering Guide (www.tallysman/orderingguide.php)for the current and complete list of available connectors.
Tallysman Wireless Inc
36 Steacie Drive
Ottawa ON K2K 2A9 Canada
Tel +1 613 591 3131 Fax 613 591 3121
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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. © 2011 Tallysman Wireless Inc.  All rights reserved.  Rev 3.1

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