TW2505 Embedded Globalstar Certified STU Antenna The TW2505 by Tallysman Wireless is a professional grade, embedded, passive left hand circularly polarized antenna for the 1610 to 1620 MHz frequency band, certified and specifically designed to maximise the performance of the Globalstar STU (Simplex Transmit Unit) Modem. The TW2505 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 TW2505 Dimensions (mm) single feed antennas. The TW2505 provides excellent Globalstar signal coverage, and comes in a compact circular form factor with a built-in 50 mm diameter ground plane and with a 15 cm RG174 cable. Applications Simplex Transmit Unit (STU) Applications Sea & Land Container Tracking Military & Security Fleet Management & Asset Tracking Marine & Avionics Systems Law Enforcement & Public Safety Features Benefits Custom high gain 4.25 dBic dual-feed patch Excellent circular polarized signal transmission Great axial ratio, 3 dB over full bandwidth Industrial temperature range 15 KV ESD circuit protection Rugged Design Robust design RoHS compliant Small form factor TW25 05 Embedded Globalstar Certified STU Antenna Specifications Vcc = 3V, over full bandwidth, T=25C A ntenna A rchitecture Dual, quadrature feeds Antenna Gain (100mm ground plane) 4.25 dBic Axial Ratio (over full bandwidth) 3 dB Electrical Architecture Hybrid 90 phase signal 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 (over 10 dB bandwidth) <-20dB ESD Circuit protection 15 KV air discharge Cross Polarization Rejection 15 dB minimum across the band Mechanicals & Environmental Mechanical Size 50 mm dia. x 7.8 mm H Cable RG174 / 15 cm, custom lengths optional Operating Temp. Range -40 to +85 C Weight 100 g Attachment Method Adhesive or screw mount Environmental 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 Legacy Part Numbers: TW2505 Globalstar STU antenna, 15cm cable, SMA Male 32-2505-0 TW2505 Globalstar STU antenna, 15cm cable, MCX R/A 32-2505-5 TW2505 Globalstar STU antenna, 15cm cable, MMCX R/A 32-2505-6 * As a result of a growing product portfolio, Tallysman has rationalized its part number system. No changes have been made to the mechanical or electrical properties of these products. Where administratively possible, please use the following Part Numbers. TW2505 Globalstar STU antenna, 33-2505-xx-yyyy-zz Where xx = connector type, yyyy = cable length in mm and zz = assigned by Tallysman for custom tuning Please refer to the Ordering Guide (