HT644 User Guide v07/11

1 HT644 User Guidev07/11 Professional submersible marine handheld transceiversHT644 LCDT opicPage Certification2 Introduction3 Packing List3 Radio Care3 Preparing Your Radio For Use4 Battery Care / Information5 & 6 Using Your HT6447 Reception7 Transmitting7 Channels8 & 9 Functions10 The Scan Function10 VOX (Voice Operate Transmit)10 LCD Indicators11 Optional Accessories12 & 13 Standard Features13 Controls14 & 15 Glossary of Terms16 Troubleshooting17 Channel Chart 18 & 20 Technical Specifications21 & 22 Notes23 & 24 TOCT able of Contents12 CertificateDeclaration of ConformityIntroductionWe Entel UK Limited of:320 Centennial AvenueCentennial ParkElstreeBorehamwoodHertfordshireWD6 3 TJUnited KingdomDeclares under our sole responsibility that the product range: HT644 Series Handheld Radio TransceiverConforms to the following standards or other nominative docum ents: EN 301 178 -2 : 2007-02, EN 60945:2002, EN6095 0-1: 2006, in accordance withDirective 1999/5 Number _____M AustinQuality Manager1 October 2010 Date:WarrantyThe HT644 comes with a 24 month warranty,for details see our full terms & Do not use options or accessories notspecified by Entel Ensure that the radio is used within theparameters for which it was designed Please switch the transceiver off beforeconnecting optional accessoriesWarning Turn the transceiver off in the followinglocations.

2 In explosive atmospheres (flammable gas,dust including metallic & grain powders etc) Whilst taking on fuel or while parked near afuel station Near explosives or blasting sites In aircraft, medical institutions or nearpersons known to be wearing a pacemakerCaution Do not disassemble or modify thetransceiver for any reason Do not transmit while touching the antennaterminal or any exposed metallic parts of theaerial as this may result in a burn Please check and observe regulations in yourcountry with regard to use whilst drivingEnd of Life DisposalWhen your Entel transceiver reaches the end of itsuseful life, please ensure that the unit is disposed of inan environmentally friendly way. For country specificinformation please see your RadioAfter exposure to any potentially corrosive substanceincluding salt water it is recommended to thoroughlywash the transceiver in fresh water.

3 If washing with thebattery removed from the radio, ensure that thebattery is not immersed in water & that the accessorycap is attached & clean only with a damp Entel HT644 is a professional marine handheld transceiver that operates on the VHF marine HT644 has 58 marine international channels, 10 weather & 36 dealer programmable private channels. The 58 marine channels are switchable to comply with USA, International or Canadianregulations. This is done via the radio s keypad. It has an emergency channel, which can be immediatelyselected from any channel using the red 16/9 button. Weather channels can also be accessed immediatelyusing the [WX] key. The HT644 includes the following features: Scan, A/B quick access channels, batterylife indicator, VOX (voice activated transmit), low battery indicator, large LCD with back light. HT644 Transceiver CNB750E Rechargeable 1800mAh Li-Ion battery CBH750 Spring loaded belt clipPacking List CATXX Antenna CCA trickle charger included with certain models Radio CareNote: Do notwash thetransceiver ifyou suspect thewaterproofingseal may bedamaged.

4 Pleasereturn to yoursupplier forinspection Your Radio For Use4 Preparing56ab---Attaching / Removing the Belt Clip 5To attach, slot the clip onto the slot on theb ack of the battery and slide up until youhear a click 6To remove, pull the tab towards the beltclip (a). Then slide the belt clipdownwards (b)Attaching / Removing the Aerial 1To attach, carefully align the aerial with thesocket. Screw in the aerial clockwise (takingcare not to cross the thread) until it is seatedfirmly with the accessory cover s rubber ringbetween the aerial & the the top of the radio. 2To remove, unscrew the aerial / Removing Audio Accessories 3To attach, remove the accessory cover by unscrewing thelocking screw anti-clockwise (leave cover secured underantenna as this provides a waterproof seal). Attach accessoryplug by locating over the socket. Carefully tighten the lockingscrew clockwise until finger tight (do not tighten with ascrewdriver etc).

5 4To remove, unscrew accessory plug the locking screw byhand in an anti-clockwise direction (carefully use a coin orscrewdriver if too tight). Ensure you re-fit the accessorywaterproof cover so as to protect the accessory Entel radio is supplied with a highperformance Lithium-Ion (Li-Ion) battery. Thesebatteries: Extend talk time Reduce the battery s size and weight Do not suffer from memory effect thatreduces the life of Ni-Cad and NiMHbatteries Have a low toxicity, therefore reducing theimpact on the environmentBattery Pack If a battery is not used for an extendedperiod of time ( several months) youmust: Charge the battery to about 50% of itsnormal capacity(a 3 hour charge from flat). Remove the battery from the radios andstore in a cool and dry location (at around0 C). Re-charge the battery to 50% capacityatleast every 6 months whilst in storage.

6 In normal use each charge cycle reduces thebattery s life. Minimise the number of timesyou charge your battery especially in hotterenvironments which further shortens abattery s Care / InformationBattery Pack Precautions Switch the transceiver OFF beforecharging Charge the battery pack before use Do not recharge the battery pack if it isalready fully charged. Charge the battery in accordance with theinstructions enclosed with your charger Do not charge the transceiver and /orbattery pack if they are battery pack includes potentiallyhazardous components. Please: Do Not disassemble or reconstructbattery Do Not short-circuit the battery Do Not incinerate or apply heat to thebattery Do Not immerse the battery in waterunless attached securely to the radio orget it wet by other means Use only the specified charger andobserve charging requirements Do Not pierce the battery with anyobject or strike it with an instrument Do Not use the battery pack if it isdamaged in any way Do Not reverse-charge or reverse-connect the battery Do Not touch a ruptured or liquids from the battery get into your eyes,immediately: Wash your eyes out with fresh water &avoiding rubbing them.

7 Seek medical treatment. BatteryBattery Charging1. Connect the AC adapter to the chargerpod. The LED status light will illuminategreen indicating ready for charge2. Turn the transceiver off3. Insert the battery pack into the chargerpod, either with or without thetransceiver attached. The LED status lightchanges from green to RED & tricklecharge begins4. A fully discharged battery pack will takeapproximately 6 hours to charge,depending on the remaining powercondition. When charge is complete, theLED status light turns :The battery pack has an over-currentprotection circuit fitted. When charging acompletely discharged battery first charge,ensure the battery is removed from the radioand then re-attached (if fitted to radio whencharging). This will reset the protectioncircuitry and ensure normal operation. Thisprocess will need to be repeated if the batteryis allowed to completely discharge in thefuture.

8 In normal use this is Care / InformationBattery IndicatorFor your safety and convenience yourtransceiver continually monitors the batterypack and gives an indication on the LCD: 3 Segments: 12 hours 2 Segments: 1 hour 1 Segment: 20 minsNote: Only genuine Entel batteries should beused. Customer satisfaction is assured as youcan not be supplied with sub standard,potentially dangerous battery packs from 3rdparty manufacturers, ensuring it delivers theexpected capacity and HT series batteries a breathablemembrane is used. This is clearly marked onthe battery label. Piercing the membrane willallow water ingress to the battery, & willinvalidate the / Removing the Battery Pack1To attach, locate the pegs on the bottom of thebattery into the slots on the radio and press thetop of the battery against the radio. Securebattery by tightening the screw clockwise byhand.

9 (Do not over tighten) 2To remove, unscrew the locking screw anticlockwise & pull the battery away from thetop of the Your HT6441. To Turn the radio on rotate the volume control clockwise, to select the desired audio levelcontinue rotating the control clockwise. to increase volume & counter clockwise to power-on, the transceiver will always default to the last channel One second after start-up a tone is generated to indicate the transceiver has passed its self-diagnostic test. During standby the LED indicator will pulse amber every 3 seconds, to verifyits circuitry is functioning correctly. 3. Use the [UP/DOWN] keys to select a desired channel. A full listing of all available channels can befound on page When receiving a signal the LED indicator illuminates green & an RX is displayed on the While the radio is operating, if you hear white noise you may need to adjust the squelch thresholdof the radio, for more information see page 8 Adjusting Squelch Threshold.

10 On some channels aslight adjustment of the squelch threshold is needed as some channels have a higher noise levelthan Perform steps 1 through 3 of Before transmitting, monitor the channel and make sure it is For communications over short distances, press the [H/L] key and select low power (1 watt).Transmitting on 1 watt prolongs battery life, and should be selected whenever When receiving a signal, wait until the signal stops before transmitting. The transceiver cannottransmit and receive Press the [PTT] (Push-To-Talk) button to begin your transmission. To confirm transmission inprogress the LCD indicator illuminates TX and the LED illuminates Hold the transceiver 1 inch from your mouth and speak slowly and clearly into the When the transmission is finished release the [PTT] The Radio On & OffTurn the ON/OFF control on the top of the radio clockwise until the LCD iluminates & a shortbeep is emitted.