Tallysman TW3870/TW3872

TW3870/TW3872 GPS L1/L2 + GLONASS G1/G2 + BeiDou B1 + Galileo E1 Antenna

The TW3870/TW3872 employs Tallysman's unique Accutenna technology covering the GPS L1/L2, GLONASS G1/G2, Galileo E1, BeiDou B1, and SBAS (WAAS, EGNOS & MSAS) frequency bands.



The TW3870/TW3872 employ Tallysman’s unique Accutenna technology providing dual band GPS L1/L2, GLONASS G1/G2 + BeiDou B1 + Galileo E1 coverage and is especially designed for precision dual frequency positioning.

The TW3870/TW3872 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/TW3872 offers excellent axial ratio and a tightly grouped phase center variation.

The TW3870/TW3872 covers GPS L2 (1227.6 MHz), GLONASS G2 (1248 MHz centre), GPS L1/WAAS/EGNOS/MSAS (1575.42MHz), GLONASS G1 (1602 MHz, centre), BeiDou B1 and Galileo E1. (1561 and 1589 MHz).

The TW3872 has a pre-filter which increases the antenna’s immunity to high amplitude interfering signals, such as LTE and other cellular signals.

The TW3870/TW3872 is housed in a through-hole mount, weather-proof 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 100 mm ground plane is recommended for non-roof-top installations.

This product is also available in an OEM formats (TW3865, TW3870E, TW3872E, and TW3868).


  • Precision GPS position
  • Dual Frequency RTK receivers
  • Mission Critical GPS Timing
  • Military & Security
  • Network Timing and Synchronization


  • 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


  • Ideal for L1/L2 RTK surveying systems
  • Great multipath rejection
  • Increased system accuracy
  • Great signal to noise ratio
  • IP67, REACH, and RoHS compliant

Ordering Information

TW3870 – GPS L1/L2 + GLONASS G1/G2 + BeiDou B1 + Galileo E1 33-3870-xx-yy-zzzz
TW3872 – GPS L1/L2 + GLONASS G1/G2 + BeiDou B1 + Galileo E1 33-3872-xx-yy-zzzz

Where xx = connector type, yy = shape and colour of radome and zzzz = cable length in mm (where applicable)