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User’s Manual

LT-700 Portable Transmitter

D o n ’ t m i s s a s i n g l e s o u n d . L i s t e n .

Listen Technologies Corporation
8535 South 700 West, Suite A
Sandy, Utah 84070-2515 USA
Telephone: +1.801.233.8992
Toll Free (North America): 1.800.330.0891
Fax: +1.801.233.8995
E-mail: [email protected]

Listen

and the Listen logo are registered trademarks of Listen Technologies Corporation

Summary of Contents for LT-700

Page 1: ...ten Technologies Corporation 8535 South 700 West Suite A Sandy Utah 84070 2515 USA Telephone 1 801 233 8992 Toll Free North America 1 800 330 0891 Fax 1 801 233 8995 E mail info ListenTech com Listen and the Listen logo are registered trademarks of Listen Technologies Corporation ...

Page 2: ...our products Should there be any problems with your Listen products we are ready to help you in any way we can Should you have any comments on how we might improve our products or our service we re here to listen Here s how to reach us Telephone 1 801 233 8992 Fax 1 801 233 8995 Toll Free North America 1 800 330 0891 E Mail support ListenTech com Web www ListenTech com Thank you and enjoy your lis...

Page 3: ...Welcome to Listen ii LT 700 072 72MHz or 216MHz Warranty Card User Manual LT 700 Package Contents 72 MHz LT 700 072 216 MHz LT 700 216 Listen Part Number See pages 32 33 Optional Accessories ...

Page 4: ...iii this page intentionally left blank ...

Page 5: ...s 13 Charging Batteries 14 Operation with a Wall Transformer 16 Supplementary Information 17 Channel Selection 18 Listen SQ 20 RF Reception Maximization Strategies 21 72 MHz Frequency Compatibility Table 22 216 MHz Frequency Compatibility Table 24 Troubleshooting 26 Compliance Notice 29 FCC Statement 30 Warranty 31 Optional Accessories 32 Table of Contents ...

Page 6: ...ry level low battery battery charging channel lock program mode channel lock status and RF signal strength The portable transmitter shall incorporate automatic battery charging circuitry for recharging of NiMH batteries The Listen LT 700 is specified Specifications Specification LT 700 072 LT 700 216 RF Frequency Range 72 025 75 975 MHz 216 025 216 987 MHz Number of Channels 57 17 wide 40 narrow 5...

Page 7: ...ess end to end 0 to 95 relative humidity non condensing 5 8 oz 164 4g 1 0 lbs 0 45kg Manually lockable UP DOWN and power through door other controls behind door see Controls above 20 to 50 C 4 to 122 F 10 to 40 C 14 to 104 F Two AA batteries alkaline or NiMH Mic sensitivity NiMH alkaline battery SQ enable disable Unit can be programmed so that only desired channels are displayed to the user channe...

Page 8: ... for a channel Press and hold both buttons for 5 seconds to enter PROGRAM mode The PGM icon will appear in the display To exit PROGRAM let unit sit idle for 5 seconds Use UP and DOWN buttons to select a channel Press and hold either button for 5 seconds to lock the channel Press and hold either button again to unlock Look Listen Display The display shows level channel battery status PROGRAM mode w...

Page 9: ... if you are using any non Listen receiver or older Listen receiver that does not have the SQ feature see page 20 for more information Mic Sensitivity Switch SQ Switch Battery Select Switch 3 5mm Input Jack A microphone or line level cable connects here LED indicators Steady Red Normal operation Slow Flashing Battery is low Slow Flashing while charging Unit is charging Fast Flashing Mute MUTE TALK ...

Page 10: ...r the UP and DOWN button for 5 seconds to lock or unlock When in the PROGRAM mode L O indicates whether a particular channel is locked out Battery level indicator The indi cator flashes along with the red LED on top of the unit to alert you when the battery is low and needs to be charged or changed see information below All three segments showing The batteries are at 50 or greater capacity One seg...

Page 11: ...ace batteries in the unit yet Select Battery Type See diagram on page 8 You have two choices NiMH and Alkaline The unit is shipped with the switch in the Alkaline position Use a pen or small screwdriver to select the battery type CAUTION If you are using any battery type other than rechargeable Nickel Metal Hydride NiMH batteries make sure the BATTERY selection switch is in the alkaline position L...

Page 12: ...Listen recommends the following settings for our microphones If you are using a microphone from another vendor you may need to experiment with different settings Part Description Setting LA 261 Lavalier Microphone MED LA 262 Over the Head Microphone MED LA 268 Over the Ear Microphone MED LA 270 Noise Cancelling Microphone MED LA 277 Confrerence Microphone MED LA 272 Over the Head Mic w Earphone ME...

Page 13: ...he cor rect position for the batteries you are using ALK should be selected for all battery types other than NiMH NOTE Listen uses 1800mAh milli Amp hour constant current NiMH Nickel Metal Hydride batteries These may be purchased from your Listen dealer ask for part number LA 362 Connect the Microphone The microphone jack is located on top of the unit The LT 700 uses the microphone cable as an ant...

Page 14: ...ows you to con nect both a microphone and line input to the jack on top of the LT 700 See the diagram below for connection information You can use the microphone and the line input at the same time Please note that the MUTE switch mutes only the microphone the line source will continue transmitting when the switch is in the MUTE position If you prefer to make your own cable for connection of mic a...

Page 15: ...isplay Press and hold either button again to unlock 72MHz Units The LT 700 072 operates on 17 wide band channels and 40 narrow band channels Channels represented by letters in the display i e A are wide band channels channels represented by numbers are narrow band channels 216MHz Units The LT 700 216 operates on 19 wide band channels and 38 narrow band channels Channels beginning with a 2 are wide...

Page 16: ... the unit is a handy way to turn off the audio from the microphone Slide the switch to the mute position and the microphone audio is muted When the microphone audio is muted the LED on top of the unit flashes rapidly Slide the switch back to the talk position and the microphone audio will return to the transmission If you are using line level audio it will not be effected by the mute talk switch O...

Page 17: ...ns Enter PROGRAM Mode Press and hold the UP and DOWN keys simultaneously until the PGM symbol is displayed see the Look Listen Quick Reference on page 6 Scroll Through Channels to Lock or Unlock Use the UP and DOWN channel select keys to scroll through all available channels If the L O symbol appears with a particular channel s indicator this means that particular channel will not be available for...

Page 18: ...en Check the Listen web site for more details SmartCharge uses a pulse charging which greatly extends the life of Nickel Metal Hydride NiMH batteries The entire charging process takes about 13 hours Listen recommends that you allow the charger to complete its full cycle every time for maximum battery life IMPORTANT In order to charge NiMH batteries the BATTERY SELECT switch in your Listen product ...

Page 19: ...er again When not using the LT 700 it is recommended to leave the unit on the charger The charger provides a maintenance charge that keeps the battery at 100 If the unit is not on the charger the battery will lose up to 20 of its charge per month NOTE Listen uses 1800mAh milli Amp hour constant current NiMH Nickel Metal Hydride batteries These may be purchased from your Listen dealer ask for part ...

Page 20: ...f the LT 700 marked PWR CHG and plug the wall transformer into a grounded AC outlet You do not need to have batteries installed in the LT 700 to operate it with a wall transformer NOTE If batteries are in the unit ensure that the battery selection switch is set properly as shown on page 5 Please review the information on page 14 for important information regarding battery type and charging Wall Tr...

Page 21: ...tion Channel Selection 18 Listen SQ 20 RF Reception Maximization Strategies 21 72 MHz Frequency Compatibility Table 22 216 MHz Frequency Compatibility Table 24 Troubleshooting 26 Compliance Notice 29 FCC Statement 30 Warranty 31 Optional Accessories 32 ...

Page 22: ...isten for interference on all the wide band channels via the headphone jack on a Listen receiver Using the frequency compatibility tables on pages 22 25 eliminate any channels that have noticeable interference Now choose the channels with the widest channel spacing It is recommended that adjacent channels be spaced at least 300kHz If there is no interference the following channels are recommended ...

Page 23: ...y of clear chan nels in this band However you may experience intermodulation of the TV Channel 13 aural carrier if there is a channel 13 transmitter in your area and you are close to the transmitter If you cannot find a clear channel in 216MHz band due to channel 13 it is recommended that you switch to a 72MHz system Channel Selection continued Wide Band Recommendation Listen recommends that you a...

Page 24: ...hould disable Listen SQ Your Listen equipment has been shipped to you with the SQ feature enabled You may need to disable the SQ function for one or more of the following rea sons 1 You are using your new Listen system with older version Listen equipment that does not have the SQ function 2 You are using your new Listen system with equipment supplied by other manufacturers 3 You expect that end us...

Page 25: ...strength b Eliminate or minimize obstructions between the transmitter and the receivers c Minimize the distance between the transmitter and the receivers d Stay clear of metal objects e Keep the microphone and headphone cables fully extended Do not shorten or coil microphone and headphone cables These cables are the antennas for you portable products NOTE If the RF signal to the 216MHz model recei...

Page 26: ... 16 8 D 72 4 72 4250 9 9 9 N9 21 17 72 4500 18 9 72 4750 10 10 10 N0 22 19 72 5000 C C C C C 23 20 10 E 72 5 72 5250 11 11 11 C1 24 21 72 5500 22 11 72 5750 12 12 12 C2 25 33 72 6000 O O O O O 24 12 F 72 6 72 6250 13 13 13 O2 26 25 72 6500 26 13 72 6750 14 14 14 4 27 72 7000 D D D D D 28 14 G 72 7 72 7250 15 15 15 D5 29 72 7500 30 15 72 7750 16 16 16 D6 30 31 72 8000 P P P P P 32 16 H 72 8 72 8250...

Page 27: ...2 22 R2 47 57 75 5000 F F F F F 48 58 28 J 75 5 75 5250 23 23 23 F3 49 59 75 5500 60 29 75 5750 24 24 24 F4 50 61 75 6000 S S S S S 62 30 K 75 6 75 6250 25 25 25 S5 51 63 75 6500 64 31 75 6750 26 26 26 S6 52 65 75 7000 G G G G G 53 66 32 L 75 7 75 7250 27 27 27 G7 54 67 75 7500 68 33 75 7750 28 28 28 G8 55 69 75 8000 T T T T T 70 34 M 75 8 75 8250 29 29 29 T9 56 71 75 8500 72 35 75 8750 30 30 30 T...

Page 28: ...6 22 216 1625 1D 7 23 216 1750 2D 44 44 44 B 4 14 216 1875 3D 8 8 216 2125 1E 9 9 C09 N09 216 2250 2E 45 45 45 C 5 2 216 2375 3E 10 24 216 2625 1F 11 25 216 2750 2F 46 46 46 D 6 11 216 2875 3F 12 12 C12 N12 216 3125 1G 13 13 216 3250 2G 47 47 47 E 7 7 216 3375 3G 14 26 216 3625 1H 15 27 216 3750 2H 48 48 48 F 8 15 216 3875 3H 16 16 C18 N18 216 4125 1J 17 17 C21 216 4250 2J 49 49 49 G 9 18 216 4375...

Page 29: ...9 C29 216 7250 2P 55 55 55 L 14 19 216 7375 3P 30 83 216 7625 1R 31 84 216 7750 2R 56 56 56 15 4 216 7875 3R 32 72 C32 N72 216 8125 1S 33 73 C33 216 8250 2S 57 57 57 13 216 8375 3S 34 76 216 8625 1T 35 85 216 8750 2T 58 58 58 9 216 8875 3T 36 86 216 9125 1U 37 77 C37 N77 216 9250 2U 59 59 59 17 216 9375 3U 38 88 216 9625 1V 39 79 C39 216 9750 2V 60 60 60 5 216 9875 3V 40 80 C40 N80 Frequency MHz L...

Page 30: ...g an approved Listen microphone Try using a different mic sensitivity switch setting the switch is located inside the battery compartment of the unit If you are using a line level input try turning down the level of the input If you are using any equipment that does not have SQ capability turn off SQ in the LT 700 There is hum in the audio The microphone may be too close to a transformer Try movin...

Page 31: ...e mic sensitivity switch located inside the battery compartment Ensure the microphone is not brushing up against anything See page 8 for more information There is interference Try different frequencies until you find a clear channel If this does not work try a different fre quency band i e if you are using 72MHz equipment exchange it for 216MHz equipment This is done by returning the equipment to ...

Page 32: ...cannot change the channel It is probably locked check for the padlock icon To unlock press and hold the UP or DOWN button for 5 seconds My batteries are not charging Make sure you are using NiMH batteries and that the BATTERY SELECT switch inside the bat tery compartment is set to the NiMH position Make sure the batteries are installed correctly Make sure you are using the right kind of wall trans...

Page 33: ...ates Navy SPASUR installations You do not need an FCC license to operate these transmitters These transmitters may only be used to provide auditory assistance to persons with disabilities persons who require language translation or persons in educational settings health care services to the ill law enforce ment tracking services under agreement with a law enforcement agency or automated maritime t...

Page 34: ...and on the user is encouraged to try to correct the interference by one or more of the following meas ures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help This equipment has b...

Page 35: ...r physical damage unless the damage was the result of a manufacturing defect Listen is not liable for consequential damages due to any failure of equipment to perform as intended Listen shall bear no responsibility or obligation with respect to the manner of use of any equipment sold by it Listen specifically dis claims and negates any warranty of merchantability or fitness of use of such equipmen...

Page 36: ...Optional Accessories 32 Optional Accessories LT 700 Microphones Over the Ear LA 268 Lavalier LA 261 Conference LA 277 Over the Head LA 262 Collar LA 276 Noise Canceling LA 270 Hand Held LA 274 ...

Page 37: ...s These headsets combine cabling for both a transmitter and a receiver Over the Head Mic with Earphone LA 272 Over the Ear Mic with Earphone LA 273 Use Both an Audio Source and Mic Line Microphone Y Cable LA 263 Microphones with Active Earphones ...

Page 38: ...Notes 34 ...

Page 39: ...Notes 35 ...

Page 40: ...Listen Technologies Corporation 8535 South 700 West Suite A Sandy Utah 84070 2515 USA Telephone 1 801 233 8992 Toll Free North America 1 800 330 0891 Fax 1 801 233 8995 E mail info ListenTech com ...

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