Technical Specification

📡 1. RECEIVER (NAVTEX)

• Type: Dual-channel NAVTEX receiver (GMDSS compliant)
• Receiving Frequencies:
  • 518 kHz (International NAVTEX)
  • 490 kHz or 4209.5 kHz (Local NAVTEX)
  • Simultaneous dual-frequency reception
• Reception Mode: F1B (narrowband telex)
• Sensitivity:
  • 2 µV e.m.f. (50 Ω, ≤4% error rate)
• Input Protection:
  • Withstands 30 Vrms for ≥15 minutes
• Spurious Emission:
  • ≤ 1 nW

🖥️ 2. DISPLAY UNIT

• Display Type: Monochrome LCD
• Screen Size: 5-inch
• Resolution: 240 × 320 pixels
• Display Modes:
  • Message list mode
  • Message display mode

💾 3. MEMORY CAPACITY

• Storage:
  • 200 messages × 2 channels
  • ~100,000 characters per channel
• Memory Type: Non-volatile (data retained without power)

📡 4. ANTENNA SYSTEM

• Type: H-field loop antenna (NX-7H)
• Impedance: 50 Ω
• Power Supply: +7V to +9V via coaxial cable
• Features:
  • Built-in preamplifier
  • No grounding required
• Protection: IP66 (marine waterproof)

🔌 5. INTERFACE / DATA

• Standard: IEC 61162-1 / 61162-2 (NMEA compatible)

Input Data (GPS / navigation):

• GGA, GLL, RMC, ZDA
• VTG, VHW, VBW, GNS
• ACK, NRQ, NMK

Output Data:

• NRX (NAVTEX data)
• ALR (alarm signal)

⚡ 6. POWER SUPPLY

• Voltage: 12 – 24 V DC
• Current Consumption: 0.4 – 0.7 A

🌡️ 7. ENVIRONMENTAL CONDITIONS

• Operating Temperature:
  • Antenna: −25°C to +70°C
  • Display/Receiver: −15°C to +55°C
• Humidity: ≤ 95% at +40°C

💧 8. PROTECTION (IP RATING)

• Antenna Unit: IP66
• Receiver Unit: IP20
• Display Unit: IP25 (front panel)

⚖️ 9. PHYSICAL DATA

• Weight: ~0.7 kg (display unit)
• System Components:
  • Display unit (NX-700B)
  • Receiver unit (NX-7001)
  • Antenna (NX-7H)