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Tallysman TW3870 Antenna
Tallysman TW3870 Antenna
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TW3870 GPS L1 and L2 / GLONASS G1 and G2 Antenna

Item# TW3870

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

Category: L1L2 GPS
Manufacturer: Tallysman Wireless
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 compliant

TW3000 Family of Products 

ALL of the connector options with or without cables (max length 5m) are shown below. Please contact us with questions.

00 = SMA straight male (plug) 
01 = TNC female
02 = MCX straight male (plug) 
03 = MMCX straight male (plug) 
04 = SMB straight male (plug)
05 = MCX right angle male (plug) 
06 = MMCX right angle male (plug) 
10 = SMA Right Angle ** 
11 = Reverse polarity SMA**

12 = Waterproof SMA**
13 = SSMA **
15 = TNC male (plug) 
16 = N-Type Male** 
17 = BNC Male
18 = FME** 
19 = MMCX Female
NMO = NMO mount
20 = SMA Female
22 = R/A QMA**

23 = SMP**
24 = SMC Male
25 = SMC Straight Female 
26 = SMB Straight Female
27 = MCX Female Straight
28 = SSMCX Straight Plug**
29 = R/A SSMCX Plug **
30 = SMB with Overmold**
33 = MMCX straight male ** 
34x = FAKRA (replace “x” with colour code)**








Custom Cable Lengths: 0m-5m
Cable length tolerances: <1m: ±3.0mm, 1-4.9m: ±30mm, >5m: ±50mm

Connector Options Without Cable:
01 = TNC female

** Premiums apply. Please contact NavtechGPS for information and pricing.

Radome Options:
00=Dark Grey Conical 10=Dark Grey Low Profile 01=White Conical 11=White Low Profile