33-1889-05-0150

## A Tallysman _Accutenna[®]_ TW1889 GPS L1/L2 + GLONASS G1/G2/G3 

The TW1889 employs Tallysman’s unique _Accutenna_ technology providing dual band GPS L1/L2, GLONASS G1/G2/G3, Galileo E1/E5b, and BeiDou B1/B2 coverage and is especially designed for precision dual frequency positioning where light weight is important. 

The TW1889 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 TW1889 offers excellent axial ratio and a tightly grouped phase center variation. 

The TW1889 covers GPS L2 (1227.6 MHz, centre), GLONASS G2 (1248 MHz, centre), GLONASS G3 (1201.5 MHz, centre), GPS L1/WAAS/EGNOS/MSAS (1575.42 MHz), GLONASS G1 (1602 MHz, centre), Galileo E1 (1575.42 MHz centre), Galileo E5b (1201.5 MHz, centre), BeiDou B1 (1575.42 MHz, centre), and BeiDou B2 (1207.14 MHz, centre). 

The TW1889 has a pre-filter which increases the antenna’s immunity to high amplitude interfering signals, such as LTE and other cellular signals. 

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## **Applications** 

- Airborne Unmanned Autonomous Vehicles 

- Precision GPS position 

- Dual Frequency RTK receivers 

- Mission Critical GPS Timing 

- Military & Security 

- Network Timing and Synchronization 

## **Features** 

- Very low Noise Preamp, 2.5 dB 

- Axial ratio: <2 dB 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 16 VDC 

## **Benefits** 

- Lightweight (37g excluding cable and connector) 

- Ideal for L1/L2 RTK surveying systems 

- Great multipath rejection 

- Increased system accuracy 

- Excellent signal to noise ratio 

- IP67, REACH, and RoHS compliant 

## TW1889 GPS L1/L2 + GLONASS G1/G2/G3 

**Specifications** (Measured at Vcc = 3V, and Temperature = 25°C) 

## **Antenna** 

Patch Architecture Circular, Dual Feed, Dual Stacked Patch L2 Peak Gain (100mm ground plane), 1215-1240 MHz 4.0 dBic peak gain at Zenith G2 Peak Gain (100mm ground plane), 1237-1246 MHz 3.0 dBic peak gain at Zenith E5b/G3 Peak Gain (100mm ground plane), 1189-1214 MHz 1.0 dBic peak gain at Zenith L1 Peak Gain (100mm ground plane), 1575.42MH-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 L2:  1170MHz-1278MHz (filter bandwidth) L1:  1557 MHz-1606MHz (filter bandwidth) Overall LNA Gain 27 dB typ., 26 dB min., each of L1 and L2 bands Gain Variation with Temperature. 3 dB max. over operational temperature range LNA Noise Figure 2.5 dB 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 L2 +/- 100MHz Supply Current 12 mA typ. at 25°C ESD Circuit protection 15 KV air discharge Out-of-Band Rejection **L1 L2** <1450 MHz >47 dB <1000 MHz >70 dB <1520 MHz >35 dB <1100 MHz >36 dB >1650 MHz >30 dB <1130 MHz >30 dB >1800 MHz >49 dB >1340 MHz >51 dB 

## **Mechanicals & Environmental** 

Mechanical Size, Ground Plane 48mm(d)x12.2mm(h)100mm ground plane recommended Cable 1.38mm OD (micro-coax) or 2.6mm OD (RG174) Operating Temperature Range -40°C to +85°C Weight 37 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** 

TW1889 - GPS L1/L2 + GLONASS G1/G2/G3 Where xx = connector type, yyyy = cable length in mm (all 4 digits required) 

33-1889-xx-yyyy 

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. 

36 Steacie Drive, Ottawa ON K2K 2A9 Canada Tel +1 613 591 3131 Fax 613 591 3121 sales@tallysman.com