ASELSAN 4031

📡 ASELSAN 4031 – Fixed Base Radio System (VHF/UHF)

• Overview: The ASELSAN 4031 model is a fixed-base radio system operating in the VHF (146–174 MHz) and UHF bands. It is compatible with the 4035 model and can be configured as a trunking radio system.

• Key Features:
  A microprocessor-controlled, 99-channel unit with software upgrade capability, encryption support, LCD screen, and keypad. Designed for compact, stationary installation.

• Technical Specifications:

  • RF Output Power: 5–30 W

  • Channel Spacing: 12.5 or 25 kHz (VHF/UHF)

  • Power Supply: 13.2 V DC (vehicle) or 220 V AC (fixed)

  • Operating Temperature: −25 °C to +55 °C

  • Dimensions (fixed unit): ~185×144×212 mm, Weight: ~1.7 kg

• Use Cases:
  Ideal for command centers, organizational communications, security systems, and as a base station in trunked radio networks.

🚗 ASELSAN 4021 – Vehicle Radio (VHF, FM – 25 W)

• Overview:
  The ASELSAN 4021 is a VHF FM analog mobile radio with 99 channels, designed for fixed installation inside vehicles. The UHF version is known as the 4025.

• Key Features:

  • Microprocessor-based architecture

  • Simple FM analog communication

  • Scanning, emergency call, squelch codes, and ID transmission

  • Security via EEPROM password lock (passphrase protection)

• Technical Performance:

  • 25 W output power, suitable for short to mid-range communication

  • Simplex or semi-duplex communication modes

  • Designed to withstand harsh conditions (temperature, humidity, vibration)

• Use Cases:
  Used in military and police vehicles, fleet operations, and urban vehicle communication networks.

🔍 Comparison Table – ASELSAN 4031 vs 4021

FeatureASELSAN 4031 (Fixed)ASELSAN 4021 (Vehicle Radio)Installation TypeFixed base (building/desktop)Fixed in-vehicle installationFrequency BandVHF & UHF (trunk capable)VHF FM, 25 WChannels9999Security / EncryptionSoftware-supported encryptionEEPROM password protectionPrimary UseBase station / trunking centerMobile communication in vehiclesFeaturesEmergency call, upgradeable SWScan, emergency call, squelch code

🛠️ Additional Notes and Usage Tips

• 4021 users report occasional issues like power warnings or low audio, often fixed through hardware tweaks (e.g., resistor adjustments in the power-sensing circuit).

• Both devices require professional maintenance, licensed software updates, and rugged environmental testing for long-term reliability.

• Programming of these radios should be done by trained personnel. Programming software is typically not provided to amateur users.

🎯 Conclusion

The ASELSAN 4031 is a robust, trunk-compatible fixed radio system suitable for central hubs, while the 4021 is a compact, high-power analog radio tailored for vehicle-based communication. The choice between them depends on your operational context—whether fixed infrastructure or mobile deployment.