双馈双频
GPS L1 & L2 + GLonASS G1 & G2内置天线，特别为双频精确定位打造，理想的单点精确定位（PPP）天线。
GPS L2 (1227.6MHz), GLonASS G2 (1248MHz 中心频率), GPS L1/WAAS/EGNOS/MSAS (1575.42MHz) and GLonASS G1 (1602MHz, 中心频率)。
The TW3865 features a precision tuned, circular dual feed, stacked patch elements. 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. This provides truly circular response over the entire bandwidth of the antenna.
The TW3865 offers excellent axial ratio and a tightly grouped phase center.
The OEM TW3865 is supplied with a standard 60mm diameter circular ground plane, with a coaxial cable terminated with a connector (right angle MCX is shown in the drawing). Mounting holes are provided for attachment to larger ground planes. Custom tuning and ground plane options may be available, depending on purchase level commitment.
| Applications |
Features |
Benefits |
- Precision GPS Positioning
- Dual Frequency RTK Receivers
- Mission Critical GPS Timing
- Military & Security
- Fleet Management & Asset Tracking
|
- Very low Noise Pream, <2dB.
- Axial ratio: <1dB typ.
- Tight Phase Center Variation
- LNA Gain: 28 dB typ.
- Low current: 25 mA typ.
- Wide supply voltage: 2.5 to 16 VDC
|
- Ideal for L1/L2 RTK surveying systems
- Ideal for L1/L2 Precise Point Positioning (PPP) systems
- Excellent multipath rejection
- Increased system accuracy
- Great signal to noise ratio
- IP67 and RoHS compliant
|
Specifications
Vcc = 3V, over full bandwidth, T=25°C
| Antenna |
|
| Architecture |
Twin Dual, Quadrature Feeds |
| Bandwidth |
L1: 34 MHz, L2: 48MHz |
| Antenna Element Gain (100mm ground plane) |
L2: 3 dBic min. L1: 4.5 dBic min. |
| Axial Ratio (over full bandwidth) |
< 1 dB typ., 3 dB max . at Zenith |
| Electrical |
|
| LNA Gain |
28 dB typ, 26 dB min, each of L1 and L2 bands |
| LNA Noise Figure |
2dB max at 25C |
| Out-of-Band Rejection |
| L1 |
L2 |
| < 1500 MHz >50dB |
<1184MHz >50 dB |
| < 1550 MHz >36 dB |
<1200MHz >30 dB |
| > 1640MHz >60 dB |
> 1284MHz >32 dB |
|
| VSWR (at LNA output) |
<1.5:1 |
| Supply Voltage Range (over coaxial cable) |
2.5 to 16 VDC nominal (12VDC recommended maximum) |
| Supply Current |
25 mA typ. 30mA max @75C |
| ESD Circuit Protection |
15 KV air discharge |
| Mechanicals & Environmental |
|
| Mechanical Size, Ground Plane |
60 mm dia. x .75 mm thick, see drawing on Datasheet |
| Operating Temp. Range |
-40 to +85 °C |
| Weight |
75 g |
| Attachment Method |
Through hole screws in ground plane |
| Environmental |
IP67 and RoHS compliant |
| Shock |
Vertical axis: 50 G, other axes: 30 G |
| Vibration |
3 axis, sweep = 15 min, 10 to 200 Hz sweep: 3 G |
| Warranty |
One year, parts and labour |
| Ordering Information |
|
| 33-3865-xx-yyyy-zz |
Embedded GPS L1&L2 + GLonASS G1&G2 Antenna |
| wher xx = connector type, yyyy = cable length in mm, and zz=Assigned by Tallysman for custom tuning |
