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Designed for tough marine environments, the HT644 has firmly established itself as a market-leading commercial-grade VHF. Its rugged, ergonomic design fits comfortably in your hand, and the extremely loud audio means calls are heard by the crew every time. For additional reassurance, the HT644 has a IP68 submersible rating of 2 metres for 4 hours to cope with the harshness of life at sea.

The HT644 has an extensive range of audio accessories including remote speaker microphones and ear defender headsets. Please see our accessories section for a complete listing.


Environmental protection to IP68 (2 Meters for 4 hours)
The practical HT644 Series 2.0 portable enjoys an IP68 (2 Meters for 4 hours) rated construction, which means that they are dust protected and fully Submersible.

Meeting MIL-STD 810C/D/E/F/G and providing commercial grade construction for tough, enduring performance. Entel's HT644 Series 2.0 portable conforms to stringent standards, enabling it to withstand the everyday rigours of shock, vibration and the corrosive effects of dust and moisture, ensuring many years of trouble free use.

2200mAh Li-ion battery
The HT644 Series 2.0 portable is supplied with the latest intelligent Lithium-ion battery technology as standard. One key advantage of Lithium-ion battery technology is the way it eliminates ‘memory effect’ meaning there is no need to fully discharge your battery before recharging. Therefore you are assured a full charge each and every time you take your Entel battery from its charger.

Robust accessory socket
The socket has been specifically designed so that when an accessory is secured to the portable, the connection can withstand any amount of punishment; from dropping to careless misuse. Furthermore, the securing bolt incorporates a shearing point to protect the connector.

The HT644 portable provides all INT, USA & CAN Marine channels.


To avoid accidental operation your radios keys & controls can be locked by the user or, if set, automatically by the radio.

VOX hands free (with audio accessory)
When using an Entel VOX enabled audio accessory, your HT644 portable can operate totally hands free. All you need to do is talk and the HT644 portable will automatically transmit for you.

The HT644 Series portable has the facility to scan for an active channel. When the channel is found, the radio will automatically select the channel for you.


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


Power Output 5W High <1W Low
Frequency Stability ± 1.5ppm
Modulation Limiting ± 5.0KHz
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


Frequency Stability ± 0.5ppm
Analogue Sensitivity -120dBm (0.2uV) 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

As standard the HT Series portable is supplied with:

  • Li-ion battery pack
  • Drop in charger
  • Spring loaded belt clip
  • High efficiency antenna
  • Quick start user guide

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