GAST3(X/B)  (OEM part number: STR-3)

STR-3 GPS antenna is the only innovating design antenna with performance, quality and a Power protection circuit built-in to protect the active LNA's, and most importantly the host GPS receiver down the connector end from the danger of a SHORT circuit external antenna (Note: GPS receiver front-end can be destroyed or de-graded by an external GPS antenna in an over-load or short conditions. The STR-3 is a low profile GPS active antenna system for the next generation multi-purpose GPS mobile antenna products for Telematics, Fleet Management, Navigations and AVL applications. This small print size of the antenna design does not reflect over-all performance, since the antenna itself needs no ground plane aid to deliver the L1 band small signal carrier that originates from the 24 orbiting USA satellites located thousands of miles over-head and with the ground reception power sensitivity at over -130dB. The STR-3 antenna is also design as a standard power input voltages in range from +2.5Vdc to +12Vdc with reverse polarity shutdown, over-current sense shutdown and an EMC power line suppression. The most important over-all design concept of the STR3 active antenna is the complete protections of the host sensitive GPS receiver made from any manufacturer that it serve and can also be destroy or de-grade using an improper design antenna.

General Specification

Architecture Design
2 Stages active LNA
Dual Filters, (BPF(dielectric) & LPF(lump element)
RF protection (10watt), nano-second Spark-Gap
Dielectric Patch antenna
Low Noise Low drop-out, Linear Regulator
Low Loss RG/174 Coax cable
Aluminum Base/ PC+ Radome Plastic
Receiving Frequency:     L1 Band(1575MHz)
Output Impedance:        50 ohms
Polarizationís:                Right Hand Circular (RHC)
Bandwidth:                    0dB Mhz @ -3dB point
VSWR:                         1.5 Typical @ 1575MHz
Elev. Angle Coverage:   5~90 degree
Az. Bearing Coverage:   360 degree
Filtering:                         Dual(BPF <10 Mhz B/W, LPF @1576 MHz,Stop-band @ 1585MHz)
Over-all Gain:               28dB (typical including 4dB cable loss & Filters)
Over-all NF:                 <1.8dB @fo, 2dB max.
LNA Characteristic:       K=>1 Un-conditionally Stable
Power Input:                + 2.5 Vdc to +12Vdc input, AutoSwitch
Power Consumption:     5 to 11mA (max)
Power Input Sensor:      Reverse Polarity Short Circuit shutdown
Over-Current Sensor:    Thermal Over-current shutdown >+150degreeC
Physical Dimensions:      44 x 34 x 12mm +/-0.5mm
Mount:                          Magnetic
Radome Color:             Black
Coax Cable:                 RG-174U double shielded 3m, Low Loss 0.7dB/m
Operating Temperature: -30 to + 85 degree C
Storage:                         -40 to + 90 degree C