Entel HT644 analogue VHF Marine radio

Designed for tough marine environments, the HT644 VHF radio has become a market leader for commercial-grade communication. Its rugged and ergonomic design ensures a comfortable fit in your hand, while its extremely loud audio guarantees that all calls are clearly heard by the crew, even in noisy conditions. The HT644 also boasts an IP68 submersible rating, allowing it to withstand submersion in water up to 2 meters deep for 4 hours, making it ideal for the harsh conditions at sea.

The HT644 Series 2.0 portable features environmental protection with its IP68 rating, ensuring it is both dust-protected and fully submersible. This makes it perfect for use in demanding maritime environments.

Built to endure, the HT644 meets the MIL-STD 810C/D/E/F/G standards, which means it can handle the daily stresses of shock, vibration, and exposure to dust and moisture. This commercial-grade construction ensures the radio will provide reliable performance for many years, even under the toughest conditions.

The HT644 comes with a 2200mAh Li-ion battery, utilizing intelligent Lithium-ion technology to eliminate the 'memory effect,' which allows users to recharge the battery at any time without fully discharging it. This guarantees a full charge every time the radio is taken from its charger.

Another feature of the HT644 is its robust accessory socket, designed to withstand the abuse that can come from dropping or careless handling. The connection remains secure, and the accessory's securing bolt has a built-in shearing point to protect the connector from damage.

This portable VHF radio provides all International, USA, and Canadian Marine channels, ensuring full compatibility across various marine communication standards.

Convenience Features

The HT644 offers a keylock function to prevent accidental operation. Users can lock the keys and controls manually or have the radio lock them automatically.

For ease of use, the radio includes a scan feature, allowing it to search for an active channel. When a channel is found, the radio will automatically select it, making communication seamless and efficient.

Technical Specifications

• Frequency Range: 156 - 163.275 MHz
• Channels: All International, USA, and Canadian Marine Channels
• Channel Spacing: 25 kHz
• Communication Method: Simplex / semi-duplex
• Antenna Impedance: 50 ohms
• Antenna: Whip / stubby
• Battery Type: 2200 mAh Lithium-ion battery pack
• Operating Voltage: 7.6V
• Current Drain (nominal): 40mA
• Duty Cycle: 14.5 hours (5/5/90)
• Microphone: Internal condenser microphone
• Operating Temperature: -20° to +55°C
• Construction: Compliant with MIL-STD 810C/D/E/F/G
• IP Rating: IP68 (submersible to 2 meters for 4 hours)
• Size: 59.5mm (W) x 130mm (H) x 37mm (D)
• Weight: 277g (with battery and aerial)

Transmitter Specifications

• Power Output: 5W High / <1W Low
• Frequency Stability: ±1.5ppm
• Modulation Limiting: ±5.0 kHz
• FM Hum & Noise: > -40dB
• Unwanted Emissions: <2nW up to 1GHz; <20nW from 1GHz to 2GHz
• Adjacent Channel Power: 70dBc
• Audio Response (FM): 300Hz to 3kHz, -6dB/Octave
• Audio Distortion: <5%
• FM Modulation: 16K0F3E

Receiver Specifications

• Frequency Stability: ±0.5ppm
• Analogue Sensitivity: -120dBm (0.2µV) for 12dB Sinad
• Intermodulation Response: >68dB
• Adjacent Channel Selectivity: >70dB
• Spurious Rejection: >70dB
• Rated Audio Power: 0.5W
• Audio Distortion: <5%
• Hum & Noise: > -40dB
• Audio Response: 300Hz to 3kHz, -6dB/Octave
• Conducted Spurious Emissions: <2nW up to 1GHz; <20nW from 1GHz to 2GHz