Tallysman GPS L1 + L2 | GLONASS G1 + G2 Antenna


The TW3870 employs Tallysman’s unique Accutenna™ technology providing dual band GPS L1 & L2 and GLONASS G1 & G2 coverage and is 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 variation. The TW3870 covers GPS L2 (1227.6MHz), GLONASS G2 (1248MHz centre), GPS L1/WAAS/EGNOS/MSAS (1575.42MHz) and GLONASS G1 (1602MHz, centre).

The TW3870 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 100mm ground plane is recommended for non-roof-top installations.  This antenna has been calibrated by NGS.

This product is also available in an OEM format.

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

Key Features

  • 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

Additional information