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ARKNAV GPS Tracking System

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MA-25 GPS Marine Antenna


The MA-25 GPS Marine Antenna has RF protection circuits built-in to guard the active LNA (Low Noise Amplifier) and High Gain signals as well as being able to accept a wide-range of power supplies from 3 V ~ 6V. The MA-25 GPS Marine Antenna offers ultimate performance for Marine and Networking applications. MA-25 GPS Marine Antenna is designed for maximum ruggedness in marine environments. Please Note: This antenna is A- 132 Flange GPS Antenna with a waterproof and sun-proof housing. It is a screw mounted antenna, and is usually installed on top of a vehicle or a boat.


  • 1. 10W RF protection
  • 2. Standard WAAS tune
  • 3. Short-circuit protection
  • 4. Wide range power input voltage from +3v ~ 6v
  • 5. Narrow band width at 10MHz for real GPS L1 signal
  • 6. Cable length up to 40m
  • 7. 2 stages active LNA
  • 8. Dual Filters BPF(directric)& LPF(lump element)
  • 9. Dielectric patch antenna
  • 10. Low noise, linear regulator
  • 11. High current shut down
  • 11. Radio frequency interference immunity (RFI)
  • 11. Improve overall GPS system resistance to interference
  • 11. RoHS compiant


Technical Specifications
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
Receiving Frequency L1 Band(1575MHz)
Output Impedance 50 ohms
Polarization’s Right Hand Circular (RHC)
Bandwidth < 50 MHz
VSWR 1.8 Typical @ 1575MHz
Elev. Angle Coverage 5~90 degree
Az. Bearing Coverage 360 degree
Filtering Dual(BPF <50 MHz B/W >
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
RF Insertions loss 0.1dB, leakage power 100mW /1 watt input
Power Input +3Vdc to + 6Vdc input, Auto Switching
Power Consumption 25mA
Power Input Sensor Reverse Polarity Short Circuit shutdown
Over-Current Sensor Thermal Over-current shutdown >+150degreeC
Dimensions 79d x 58h x 13 mm (CHECK THIS!!)
Mount 13 mm treaded (1/2inch)
Radome Color White
Coax Connector BNC,SMA,TNC or on request
Coax Cable RG-58, RG-174, RG-316
Operating Temperature -30 to + 85 degree C
Storage -40 to + 90 degree C


File Name File Size Time
MA-25 GPS Marine Antenna ARKNAV-Datasheet 201 KB Sep 8th 2009