TW8825 TALLYSMAN | Alldatasheet
Document overview
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Technical content
Features
- Very low Noise Preamp, 2.5dB
- Axial ratio: <2dB typ.
- Tight Phase Center Variation
- LNA Gain 26 dB typ.
- Low current: 12 mA typ.
- ESD circuit protection: 15 KV
- Invariant performance from: +2.5 to 16VDC Benefits
- Lightweight (52g excluding cable and connector)
- Ideal for L1/L5 RTK surveying systems
- Great multipath rejection
- Increased system accuracy
- Excellent signal to noise ratio
- IP67, REACH, and RoHS compliant The TW8825 employs Tallysman’s unique Accutenna technology providing dual band GPS L1/L5, GLONASS G1, Galileo E1/E5a, and BeiDou B1 coverage and is especially designed for precision dual frequency positioning where light weight is important. The TW8825 features a precision tuned, circular dual feed, stacked patch element. The signals from the two ortho gonal feeds are combined in a hybrid combiner, amplified in a wide -band LNA, then band -split for narrow filtering in each band and further amplified prior to recombination at the output. The TW8825 offers excellent axial ratio an d a tightly grouped phase center variation. The TW8825 covers GPS L 5 + Gali leo E5a (1176.45MHz centre), GPS L1/WAAS/EGNOS/MSAS (1575.42MHz), GLONASS G1 (1602MHz, centre) , Galileo (1575.42MHz centre), and BeiDou B1 (1575.42MHz centre) The TW8825 has a pre -filter which increase s the antenna’s immunity to high amplitude interfering signals, such as LTE and other cellular signals. TW8825 GPS L1/L5 + GLONASS G1 + BeiDou B1 + Galileo E1/E5a (all dimensions in mm)
TW8825 GPS L1/L5 + GLONASS G1 + BeiDou B1 + Galileo E1/E5a Specifications (Measured a Vcc = 3V, and Temperature = 25°C) Antenna Patch Architecture Circular, Dual Feed, Dual Stacked Patch L5 Peak Gain (100mm ground plane), 1164-1189MHz 3.7 dBic peak gain at Zenith L1 Peak Gain (100mm ground plane), 1575.42-1606MHz 4.0 dBic peak gain at Zenith Axial Ratio, over full bandwidth, both L1 & L2 ≤ 2dB typ, 1 dB max. at Zenith Polarization RHCP Electrical Bandwidth L5: 1164MHz-1189MHz (Filter bandwidth) L1: 1557 MHz-1606MHz (Filter bandwidth) Overall LNA Gain 27dB typ, 26 dB min, each of L1 and L5 Bands Gain Variation with Temperature. 3dB max over operational temperature range LNA Noise Figure 2.5dB typ @25°C VSWR (at LNA output) <1.5:1 typ. 1.8:1 max. Supply Voltage Range +2.5 to 16VDC nominal, up to 50mV p-p ripple EMI Immunity 50V/Meter, excepting L1+/-100MHz and L5 +/- 100MHz Supply Current 12 mA typ. at 25°C. ESD Circuit protection 15 KV air discharge. Out-of-Band Rejection L1 L5 <1450 MHz >35 dB <1000 MHz >80 dB <1520 MHz >30 dB <1100 MHz >34 dB >1650 MHz >35 dB >1230 MHz >43 dB Mechanicals & Environmental Mechanical Size, Ground Plane 100mm ground plane recommended Cable 2.6mm OD (RG174) Operating Temperature Range -40°C to +85°C Weight 52 g Environmental RoHS and REACH compliant Shock Vertical axis: 50 G, other axes: 30 G Vibration 3-axis, sweep = 15 min, 10 to 200 Hz sweep: 3 G
Ordering Information
TW8825 - GPS L1/L5 + GLONASS G1 + BeiDou B1 + Galileo E1/E5a 33-8825-xx-yyyy Where xx = connector type, yyyy = cable length in mm (all 4 digits required) Please refer to the Ordering Guide ( http://www.tallysman.com/wp-content/uploads/Current-Ordering-Guide.pdf) for the current and complete list of available radomes and connectors. Tallysman Wireless Inc
36 Steacie Drive
Tel +1 613 591 3131 Fax 613 591 3121 sales@tallysman.com The informatio n provided herein is inten ded 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 al l warranties and liabilities of any kind. © 2019 Tallysman Wireless Inc. All rights reserved. Rev 1.2