TW3870 GPS L1 and L2 / GLONASS G1 and G2 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).

 

• 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.