ENTEL | HT644

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.

Features:

General

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.

MILSTD 810C/D/E/F/G
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.

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

Convenience

Keylock
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.

Scan
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.

Specifications:

General
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

 

Transmitter
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

 

Receiver
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