Home » Products » GNSS Equipment » TW3870 GPS L1 and L2 / GLONASS G1 and G2 Antenna Print Page

Item #: TW3870

TW3870 GPS L1 and L2 / GLONASS G1 and G2 Antenna


The TW3870 by Tallysman Wireless is a high precision dual feed, dual band GPS and GLONASS antenna, especially designed for precision dual frequency positioning.

View Full Description
SKU: 33-387 Categories: , Manufacturer: Tallysman Wireless

Tallysman TW3870 Dual Band Antenna

The TW3870 by Tallysman Wireless is a high precision dual feed, dual band GPS (L1 and L2) and GLONASS (G1 & G2) antenna, especially designed for precision dual-frequency positioning.
The TW3870 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 TW3870 offers excellent axial ratio and a tightly grouped phase center. The TW3870 covers GPS L2 (1227.6MHz), GLONASS G2 (1248MHz center), GPS L1 / WAAS / EGNOS / MSAS (1575.42MHz) and GLONASS G1 (1602MHz, center).
The TW3870 is housed in a through-hole mount, weatherproof enclosure for permanent installations. L-bracket or pipe mount (part numbers 23-0040-0, 23-0065-0, respectively) are available for non-rooftop installation. A 100mm ground plane is recommended for non-roof-top installations.
This product is also available in an OEM format (TW3875).
Applications for this product include
  • Precision GPS position
  • Dual Frequency RTK receivers
  • Mission Critical GPS Timing
  • Military & Security
  • Very low Noise Preamp, < 2dB
  • Axial ratio: <2dB typ.
  • Tight Phase Center Variation
  • LNA Gain 35 dB typ.
  • Low current: 25 mA typ.
  • ESD circuit protection: 15 KV
  • Invariant performance from: 2.5 to 16VDC
  • Ideal for L1/L2 RTK surveying systems
  • Great multipath rejection
  • Increased system accuracy
  • Great signal to noise ratio
  • IP67 and RoHS

LNA Pre-filter Available

If you need enhanced protection against high level sub-harmonic signals like LTE and near frequency signals such as WiFi, the alternative TW3872 provides these additional benefits with an LNA pre-filter.

To minimize performance impact from signal jamming threats, the pre-filtered version of this antenna is compatible with Tallysman’s Anti-Jamming add-on, which modifies the radiation pattern of the GNSS antenna to eliminate signals arriving from -10° to +15° from horizon, while slightly increasing the gain of the antenna at zenith.

Tallysman Wireless TW3870 GPS L1 & L2 / GLONASS G1 & G2 Antenna Data Sheet

Premium Antennas for Unmanned Vehicles (UAVs)

Tallysman Connector and Cable Options

Tallysman offers a number of connector and cable options for its antennas. Use the guide below to find the available options for your antenna or contact us for help.

Tallysman Part Number Ordering Guide

Scroll to Top