A Tallysman
Accutenna
®
TW3872E GPS L1/L2 + GLONASS G1/G2 Antenna
The TW3872E employs
Tallysman’s unique
Accutenna
technology providing dual band GPS L1 & L2, GLONASS G1 &
G2, Galileo E1, and BeiDou B1 coverage and is especially
designed for precision dual frequency positioning.
This antenna features a precision tuned, circular dual feed,
stacked patch element. The signals from the two orthogonal
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 TW3872E has a pre-filter which prevents the front end
LNA from being saturated by high near frequency or
harmonic signals.
They also offer excellent axial ratio and a tightly grouped
phase center variation.
The antenna is supplied with a standard 60mm diameter
circular ground plane, with a coaxial cable terminated with a
connector (right angle MCX is shown in the drawing).
Mounting holes are provided for attachment to larger ground
planes. Custom tuning and ground plane options may be
available, depending on purchase level commitment.
TW387xE Dimensions (mm)
Applications
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Precision GPS position
Dual Frequency RTK receivers
Mission Critical GPS Timing
Military & Security
Network Timing and Synchronization
Features
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Very low Noise Preamp, < 2dB
Axial ratio: <2dB typ.
Tight Phase Center Variation
LNA Gain 35 dB typ.
Low current: 24 mA typ.
ESD circuit protection: 15 KV
Invariant performance from: +2.5 to 16VDC
Benefits
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Ideal for L1/L2 RTK surveying systems
Great multipath rejection
Increased system accuracy
Great signal to noise ratio
IP67 and RoHS compliant
TW3872E GPS L1 & L2/GLONASS G1 & G2 Antenna
Specifications
(Measured a Vcc = 3V, and Temperature=25°C)
Antenna
Patch Architecture
L2 Gain (100mm ground plane), 1227.6-1246MHz
L1 Gain (100mm ground plane), 1559 -1606MHz
Axial Ratio, over full bandwidth, both L1 & L2
1dB Bandwidth,
Polarization
Circular, Dual Feed, Dual Stacked Patch
3.5 dBic Min at Zenith on 100mm Ground Plane
4.5 dBic Min at Zenith on 100mm Ground Plane
≤ 2dB typ., 1
dB max. at Zenith, 3dB max at horizon
L2: 1227MHz-1250MHz
L1: 1559MHz–1606MHz
RHCP,
Electrical
Bandwidth
Overall LNA Gain
Gain Variation with Temperature.
LNA Noise Figure
VSWR (at LNA output)
Supply Voltage Range
EMI Immunity
Supply Current
ESD Circuit protection
Out-of-Band Rejection
L1
<1450 MHz
<1520 MHz
>1650 MHz
Mechanical Size, Ground Plane
Operating Temperature Range
Weight
Attachment Method
Environmental
Shock
Vibration
L2: 1213MHz-1261MHz (Filter bandwidth) L1: 1559MHz-1614MHz (Filter bandwidth)
35dB typ, 32 dB min, each of L1 and L2 Bands,
3dB max over operational temperature range
1.5dB typ at 25°C (TW3870E) 2.5dB typ at 25°C (TW3872E)
<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 L2 +/- 100MHz
24 mA typ. at 25°C, 25mA max at 75°C.
15 KV air discharge.
L2
>50 dB
<1180 MHz
>40 dB
>30 dB
<1190 MHz
>30 dB
>35 dB
>1284 MHz
>32 dB
60mm diameter, 0.75mm thick, see mechanical drawing
-40°C to +85°C
75 g
Through hole screws in ground plane
RoHS and REACH compliant
Vertical axis: 50 G, other axes: 30 G
3 axis, sweep = 15 min, 10 to 200 Hz sweep: 3 G
Mechanicals & Environmental
Ordering Information
TW3872E
–
Pre-filtered GPS L1/L2 + GLONASS G1/G2 antenna
33-3872E-xx-yyyy-zz
Where xx = connector type, yyyy= cable
length in mm and zz is reserved for Tallysman’s use
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 connectors.
Tel +1 613 591 3131
sales@tallysman.com
36 Steacie Drive, Ottawa ON K2K 2A9
Canada
Fax 613 591 3121
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. ©
2015 Tallysman Wireless Inc. All rights reserved.
Rev 1.6
