A Tallysman Accutenna®
TW8825 GPS L1/L5 + GLONASS G1 + BeiDou B1 + Galileo E1/E5a
The TW8825 employs Tallysman’s unique Accutenna technology
providing dual band GPS L1/L5, GLONASS G1, Galileo E1/E5a, andBeiDou 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 orthogonal feeds arecombined 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 and a tightly groupedphase center variation.
The TW8825 covers GPS L5 + Galileo 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 increases the antenna’s
immunity to high amplitude interfering signals, such as LTE andother cellular signals.

Applications••••••Airborne Unmanned Autonomous Vehicles
Precision GPS position
Dual Frequency RTK receivers
Mission Critical GPS Timing
Military & Security
Network Timing and Synchronization(all dimensions in mm)

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 16VDCBenefits
••
••
•
•

Lightweight (52g excluding cable andconnector)
Ideal for L1/L5 RTK surveying systems
Great multipath rejection
Increased system accuracy
Excellent signal to noise ratio
IP67, REACH, and RoHS compliant

TW8825 GPS L1/L5 + GLONASS G1 + BeiDou B1 + Galileo E1/E5aSpecifications (Measured a Vcc = 3V, and Temperature = 25°C)
Antenna

Patch Architecture
L5 Peak Gain (100mm ground plane), 1164-1189MHz
L1 Peak Gain (100mm ground plane), 1575.42-1606MHz
Axial Ratio, over full bandwidth, both L1 & L2
Polarization

ElectricalBandwidth
Overall LNA Gain
Gain Variation with Temperature.
LNA Noise Figure
VSWR (at LNA output)
Supply Voltage Range
EMI ImmunitySupply Current
ESD Circuit protection
Out-of-Band Rejection
L1<1450 MHz
<1520 MHz>1650 MHzCircular, Dual Feed, Dual Stacked Patch
3.7 dBic peak gain at Zenith
4.0 dBic peak gain at Zenith≤ 2dB typ, 1 dB max. at Zenith
RHCP

L5: 1164MHz-1189MHz (Filter bandwidth) L1: 1557 MHz-1606MHz (Filter bandwidth)
27dB typ, 26 dB min, each of L1 and L5 Bands
3dB max over operational temperature range
2.5dB typ @25°C<1.5:1 typ. 1.8:1 max.
+2.5 to 16VDC nominal, up to 50mV p-p ripple
50V/Meter, excepting L1+/-100MHz and L5 +/- 100MHz
12 mA typ. at 25°C.
15 KV air discharge.
L5>35 dB
<1000 MHz>80 dB>30 dB<1100 MHz>34 dB>35 dB>1230 MHz>43 dB

Mechanicals & Environmental
Mechanical Size, Ground Plane
Cable
Operating Temperature Range
WeightEnvironmental
ShockVibration

100mm ground plane recommended
2.6mm OD (RG174)-40°C to +85°C
52 g
RoHS and REACH compliant
Vertical axis: 50 G, other axes: 30 G
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
Where xx = connector type, yyyy = cable length in mm (all 4 digits required)

33-8825-xx-yyyy

Please refer to the Ordering Guide ( http://www.tallysman.com/wp-content/uploads/Current-Ordering-Guide.pdf) forthe current and complete list of available radomes and connectors.

Tallysman Wireless Inc
36 Steacie Drive
Ottawa ON K2K 2A9 Canada
Tel +1 613 591 3131

Fax 613 591 3121

sales@tallysman.com
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.
© 2019 Tallysman Wireless Inc. All rights reserved.
Rev 1.2