LT-800 User`s Manual - Barinas Translation Consultants, Inc.
Contents
1. At 72MHz The LT 800 at 72MHz operates on 17 wide band channels and 40 narrow band channels Letters Wide Band Channels Example E Numbers Narrow Band Channels Example 32 At 216MHz The LT 800 at 216MHz operates on 19 wide band channels and 38 narrow band channels 2 as left digit Wide Band Channel Example 2C I and 3 as left digits Narrow Band Channels Examples 1A 3R Q Q 5 9 e Q O o en Q Q Q O Q a LL a 10 RF Reception Maximization Strategies For proper and dependable operation Listen receivers should receive a strong and consistent signal from the originating transmitter The following strategies should be used maximize this signal a When designing and installing your system keep in mind that the location of both the transmitting and receiving antennas is critical to maximizing signal strength b Eliminate or minimize obstructions between the transmitting antenna and the receiving antenna Minimize the distance between the transmitting and receiving antennas Move transmitting and receiving antennas away from metal objects Place the transmitting antenna as high as possible Orient both transmitting and receiving antennas vertically ono CAUTION When installing antennas ensure the antenna is clear of power lines NOTE If the RF signal to the 216MHz model receiver2. User s Manual LT 800 Stationary Transmitter rt POWER TESTTONE mo MIX LEVEL CONTOUR i OV CHANNEL SELECT MONITOR A Don t miss a single sound www ListenTech com 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 Listen and the Listen logo are registered trademarks of Listen Technologies Corporation Listen Dear Valued Customer Thank you for choosing Listen All of us at Listen are dedicated to providing you the highest quality products and prompt efficient customer care Our products are manufactured in an ISO 9000 factory that has been independently certified to the highest quality standards We stand ready to answer any questions you might have during installation or in the operation of our products Should there be any prob lems 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 L 2 Q 9 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 listening experience Best regards The Listen Team LT 800 Pac
3. 5 72 7750 6 6 6 D6 30 31 72 8000 IP P F P P 32 6 H 72 8 72 8250 7 7 7 P7 31 33 72 8500 34 7 72 8750 8 8 8 P8 82 35 72 9000 E E E E 33 36 8 72 9 72 9250 9 9 9 E9 34 37 72 9500 38 9 72 9750 20 20 20 EO 35 39 74 6250 33 33 33 ES 36 40 74 6500 a 20 74 6750 34 34 34 E4 37 42 74 7000 l 38 43 21 O 74 7250 35 35 35 5 39 4d 74 7500 45 22 74 7750 36 36 36 6 40 46 75 2250 37 37 37 7 1 47 75 2500 48 28 75 2750 38 38 38 8 22 49 75 3000 J J J Ji J 43 50 24 P 75 3250 39 39 39 9 55 51 75 3500 52 25 75 3750 20 20 20 0 45 53 75 4000 R R R R R 52 26 8 75 4250 21 21 21 RI 46 55 75 4500 56 27 75 4750 22 22 22 R2 455 75 5000 F F F IF F 48 58 28 J 75 5 75 5250 28 28 28 F3 49 59 75 5500 60 29 75 5750 24 24 24 F4 50 61 75 6000 S 5 62 30 K 756 75 6250 25 25 25 S5 51 63 75 6500 64 3i 75 6750 26 26 26 6 52 65 75 7000 G G G G G 53 66 32 L 75 7 75 7250 27 27 27 G7 5467 75 7500 68 33 75 7750 28 28 28 G8 5569 75 8000 ji ji T T T 70 34 M 75 8 75 8250 29 29 29 T9 56 71 75 8500 072 35 75 8750 30 30 30 TO 57 73 759000 H H H LC 587 36 N 759 75 9250 31 31 3 HI 59 75 Parenthesis indicate T35 and T20 narrowband 12 75 9500 Co 37 NOTE Wideband frequencies in highlighted rows 75 9750 32 32 32 H2 60 7 216MHz Compatibility Chart is Oo
4. balanced audio source this will reduce the chance of creating hum Try con necting a ground from the LT 800 to ground and or to the ground of the source audio There is a tone The Test Tone button has been pressed its LED light is on Push the Test Tone button to turn off the tone cannot change the broadcast channel When the unit is locked the decimal by the channel indicator is illuminated The unit is locked To unlock press the Up and Down buttons simultaneously for 5 seconds The Audio Input 1 sounds tinny If you are using an unbalanced audio source make sure Pin 3 on the XLR or the ring on the 4 plug is grounded see page 6 cannot pick up the signal on the receiver Check to make sure the receiver and the transmitter are using the same fre quency band i e 72MHz or 216MHz and that they are on the same channel Make sure the LT 800 has an antenna connected Ensure that the receiver has an antenna LR 500 400 or 300 headset or LR 100 or 600 antenna can pick up the signal on the receiver but it sounds like it s not tuned in Check to make sure the transmitter and receiver are on exactly the same chan nel It s a good idea to lock the channels once they have been set To lock the LT 800 press the UP and DOWN buttons simultaneously for a 5 seconds see page 6 Power Up instructions LT 800 Troubleshooting I m using another brand of receiver how do tell which channel to use Refer to L
5. 5 seconds b QM INPUT LEVELS MIX LEVEL CONTOUR TESTTONE Press POWER button and verify power connections When ON channel display LED will be lit Connect Audio Inputs Connect audio source s to one or both audio input connections Input 1 offers a choice of balanced XLR or 4 phono connection Input 2 is an unbalanced phono connector mn FEA Sg lows SC ae Rear M ee ene LT 800 with XLR connected to Input 1 i XLR Wiring 4 Phone Wiring Balanced Unbalanced Tip Ring Sleeve Sleeve 1 Balanced Unbalanced N input from Balanced Unbalanced Audio Audio Source Tip Ring Tip Ring Sleeve em Audio from Source Balanced Audio Source Unbalanced Audio Source Connect balanced and unbalanced audio sources Make sure that if you are connecting an unbalanced audio source to input 1 that pin 3 of the XLR or the ring of the 4 phone plug are connected to ground as shown Adjust audio input switches With Input 1 Switch select MIC or LINE input level for Input 2 Switch select LINE 10dBu or speaker 10dBu level See illustration on page 4 Use the headset jack to listen to audio source With the audio source or sources active and the unit pow ered ON plug a headset into the 3 5mm jack located on the LT 800 s front panel to listen to the audio source Adjust headset volume to a comfortable le
6. Channel and lock status Test Tone Red LED illuminates when test tone enabled Programming Indicators Power Supply Type In line power supply Listen part number LA 201 Power Supply Input 120VAC 60 Hz 19 watts maximum continuous Power Supply Output 15VAC 1A Power Supply Connector 02 in OD x 01In ID 5 0mm x 2 5mm barrel type Compliance UL Listed Dimensions 8 0 in x 8 0 in x 1 75 in WxDxH 20 3cm x 20 cm x 4 45cm Unit Weight 3 0 Ibs 1 4kg Unit Weight 4 4 Ibs 2 0k with LA 201 Power Supply Soke Shipping Weight 5 0 Ibs 2 3 kg Rack Mounting Y rack unit RU Temperature Operation 10 to 40 C 14 to 104 F Environmental Temperature Storage 20 to 50 C 4 to 122 F Humidity 0 to 95 relative humidity non condensing Physical LT 800 Block Diagram O O 2 J Q 2 Q 3 POWER fee BA A on off In Line CHANNEL 115VAC ___ Power Supply gt O 60Hz LA 201 L provided ISVAC HIA Power Supply 9 L bown CPU Module e Red LED ka TEST TONE On Off 12VDC 1 Listen LED Display O4 400Hz Top Mounted Antenna Stud B Antenna not provided Input 1 VU Meter ting MIX LEVEL 1 Seeve Remote Antenna Antenna not provided Transmitter RF A UN EO
7. I N O O 3 o x Q gt Q Frequency Phonic MHz Listen Ear Comtek Phonak Wiliams Gentner CSI 216 0125 216 0250 41 216 0375 2 216 0625 3 216 0750 42 216 0875 4 216 1125 5 216 1250 43 216 1375 6 216 1625 7 216 1750 44 216 1875 8 216 2125 9 216 2250 45 216 2375 10 216 2625 11 216 2750 46 216 2875 216 3125 216 3250 216 3375 216 3625 216 3750 216 3875 216 4125 1J 17 17 C21 216 4250 2J 49 49 49 G 9 18 216 4375 3J 18 18 216 5125 1K 21 61 216 5250 2K 51 51 29 H 10 3 216 5375 3K 22 62 216 5625 IL 23 28 216 5750 2L 52 52 52 11 12 216 5875 3L 24 64 C24 N64 216 6125 25 65 C25 216 6250 2M 99 53 53 J 12 8 216 6375 3 26 81 216 6625 27 82 216 6750 2N 54 54 54 K 3 16 216 6875 3 28 68 216 7125 1P 29 69 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 NOTE Wideband frequencies in highlighted rows 13 e e le Ke o o Ko 9 LT 800 Troubleshooting The LT 800 has no power Mak
8. receiver on channel E is 100 feet from the receiver The adjacent channel trans mitter on channel D should be at least 150 feet away It is highly recommended that after channel selection has been achieved you lock the channel so that it cannot be changed by the user To accomplish LOCK on the LT 800 press both the UP and DOWN buttons simultaneously for 5 seconds Repeat the process to unlock Notes in regard to using 72MHz and 216MHz systems i 72MHz in a secondary frequency band This means that other transmitters are licensed to use these frequencies Thus you may experience interference from paging transmitters and other types of transmissions You will need to find a clear channel by listening to all the wide band channels ii 216MHz is a primary frequency band and no other types of transmissions are authorized to use it Thus you will find the highest probability of clear channels 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 Wide Band Recommendation Listen recommends that you always use a wide band channel unless you need to be compatible with existing narrow band receivers from other manufactur ers Wide band channels have lower noise than their narrow band counter parts
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10. A EXER 14 Compliance Notits eive erbe EE EE er 16 EGG Stat ment z 22 eb eS 16 Warranty PEPPER 17 Optional Accessories c AE 18 Q o o 9 O O m D m o 9 O 0 oO o Q eo Specifications Architectural Specifications The stationary FM transmitter shall be capable of broadcasting on 57 channels The transmitter shall have a SNR of 80dB or greater The output power shall be adjustable to quarter half or full Channel tuning shall be capable of being locked The device shall broadcast on both wide and narrow band channels The device shall have an audio frequency response of 63Hz to 15KHz 3dB at 72MHz or of 63Hz to 10kHz 3dB at 216MHz It shall have two mixing audio inputs The device shall have the following audio controls input level mix level and an adjustable low pass shelving filter The Listen LT 800 is specified Specifications Specification LT 800 072 LT 800 216 RF Frequency Range 72 025 75 975 MHz 216 025 216 987 MHz Number of Channels 57 17 wide 40 narrow 57 19 wide 38 narrow Frequency Accuracy 005 stability 0 to 50 C 32 to 122 F Transmitter Stability Transmitter Range 1 500 ft 457 2m 3 000 ft 914 4m Output Power 8 000uV at 3m 100mW Max allowed by FCC Antenna Several available See www ListenTech com for details RF Antenna Connector Reverse BNC BNC Compliance FCC Part 15 Industry Canada All system specifications are wirele
11. L SELECT Can t change the channel It may be locked Press and hold both the UP and DOWN buttons simultane ously for 5 seconds until the decimal dot next to the channel turns off Press again to lock in a new chan nel if desired Test Tone if necessary To broadcast a test tone press the test tone button This helps to test receivers when no audio source is available This tone is not heard from the monitor jack LT 800 Transmission Compatibility with other manufacturers If you are using another manufacturers receivers with the LT 800 determine their frequency then refer to Listen s Frequency Compatibility Tables pages 12 13 to find the LT 800 channel that corresponds with the receiver s frequency As much as possible Listen has duplicated the wide band channel letters to cover fre quencies of other major brands However we recom mend verifying corresponding channel numbers and letters on the tables on pages 12 13 0 Q 3 Q 3 4 e 3 z p 6 o en Q N Listen SQ Improving Your Listening Experience We are accustomed to listening to low noise high fidelity audio delivered via CD DVD etc FM radio systems such as those made by Listen have more inherent noise compared to most sound systems To reduce noise of our systems Listen uses a noise reduction technology called ListenSQ Both the transmitter and receiver must have t
12. MHz when using a Listen receiver Listen to the audio through the headphone or via the speaker Choose a channel with the least amount of interface Unless you are interfacing with an existing nar rowband transmission system always use a wide band channel If you are using multiple channels follow this process a Same Space If you are using multiple transmitters in the same space the most number of channels that will work simultaneously is six at 72MHz and three at 216MHz With all of the transmitters off listen for interference on all the wide band channels via the headphone jack on a Listen receiver Using the frequency compatibility tables on pages 12 13 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 A C E I J and H for 72MHz and channels 2A 2K and 2V at 216MHz b Distributed Spacing If you are using transmitters that are spread out over space you can achieve more simultaneous broadcast channels However it is critical that your receiver s be located as close to its transmitter as possible You can use adjacent channels see frequency compatibility tables on pages 12 13 in this case as long as the adjacent channel transmitter is at least 5096 fur ther away from the receiver as its transmitter Example The transmitter for the
13. Ring Board lt Pre emphasis SQ i e INPUT 1 i BNC ANTENNA 4 c arto i Front 1 Input 1 Level Select Female XLRJA Me safel Line Mic Combo Connector i an Po VU Meter ai Of Y ine 10d Bu CONTOUR INPUT RF POWER g TM SQ Switch is intemal i SeeskertI0dBu diagonal left and front of Antenna Stud i Input 2 VU Input 2 Level Select Meter Line Speaker MIX OUTPUT Phono Volume T gt 3 5mm omron Q 6 o o 9 c x Q 5 Gg Quick Reference LT 800 Front Panel Controls amp Displays Top antenna connection Remove rubber plug and screw antenna in place Shows which Indicates RF channel i Adjust audio input levels of Indicates audio input output power full S p INPUT 1 and INPUT 2 here level of INPUT 1 and E NUS If decimal is lit E for more INPUT 2 Shows MIX er see channel is locked Audio level Plug in a head set and adjust volume MONITOR POWER ATEN a o MIX LEVEL CONTOUR TESTTONE CHANNEL SELECT Power ON OFF cannot be heard monitor jack LT 800 Back Panel REMOTE ANTENNA CONNECTION See the Listen TEST TONE Activates a tone to aid system setup Mix Level meter occasionally ment Tum counter clockwise for voice and clockwise for music MIX LEVEL Adjust so the CONTOUR Equaliza on lights the RED LED Connections and Settings AUDIO OUTPUT This con
14. ctly to the top of the LT 800 you will need to remove the rubber plug on top of the unit If you are using a remote antenna connected to the rear of the unit do not connect an antenna to the top connector See page 18 for antenna options or refer to the Listen website for remote antenna e ti lt Wer Options listen O 66 V LT 800 with top mount LA 102 072MHz LA 106 216MHz Telescoping Antenna connected through top of unit LA 122 Remote Antenna See RF Reception Maximization Strategies and Coaxial Cable on pages 10 and 11 Set the RF power Set the RF POWER switch for FULL or 4 Level is indicated on the front panel The amount of transmitted RF power that you will need depends on your application If you are operating other transmitters in the same environment and receivers may be used close to the antenna it is best to have the transmitter s output power at its lowest level to reduce the possibility of interference Bed li Rear of LF800 uni o O Q 9 Q o LT 800 Setup Instructions Power up a Connect the LA 201 power supply to AC power b Press the POWER button on the front panel c Select the desired channel using the UP and DOWN buttons d If desired lock in the selected channel by pressing the UP and DOWN buttons simultaneously and holding for
15. e sure the LA 201 power transformer is connected to a power source and is connected to the jack marked Power Input Make sure the POWER button is pressed There is no audio or the audio level is too low Make sure that you have an audio source properly connected to Input 1 and or Input 2 The Input 1 or Input 2 switches must be in the correct position for the appropriate input level For example if you are using the output of a mixer on Input 2 the switch should be in the Line position If it were to be in the Speaker position the level would be too low Also check the Input knob to ensure it is properly adjusted You should be able to see the VU meter deflect on Input 1 or Input 2 corresponding with the input level of the audio source Try connecting a headset to the front panel jack and adjusting the Monitor vol ume control so that you can listen to the audio source The audio is distorted Check to make sure you have the input level select switches in the proper posi tion You may be providing too much audio level for the input stage to handle Make sure the SQ switch is in the correct position on both the LT 800 and the receivers you are using If your receivers do not have SQ make sure the SQ switch inside the top of the LT 800 is turned off see page 5 There is hum in the audio Make sure you have properly grounded the audio source to the LT 800 Check the connections from the audio source to the LT 800 If you can try to use a
16. er Stationary Unit Antennas o o e o o Q o o fe e 9 P Q O Telescoping 72MHz Helical Top Mount Top Mount LA 106 for 72MHzor LA 101 for 72MHz LA 102 for 216MHz LA 122 Universal Antenna Kit t The single solution for all of your indoor remote antenna needs Includes 72 and 216MHz compo 90 Degree 216MHz Ground nents flexible and rigid dipoles and Helical Plane monopole radials hardware for mul Rear Mount Remote Mount LA 123 for 72MHz or outdoor tiple mounting configurations and 25 feet 7 6 m of RG58 coax cable LA 124 for 216MHz LA 107 for 216MHz LT 800 Rack Mount Options LA 326 Rack Mounting Kit Includes components for single and dual rack Antenna Kit for the configuration and a security cover LA 326 Rack Mount Kit LA 125 for 72MHz and LA 126 for 216MHz Rack mounted units cannot use the LA 106 LA 102 or LA 101 top mounted antenna Optional Accessories continued Replacement 115vac 60hZ Power Supply LA 201 RG58 Coaxial Cable LA 112 BNC Adapter BNC Connector BNC Connector LA 121 for RG58 for RG8 LA 127 LA 128 RG8 Low Installation of LossCoaxial BNC Connectors Cable LA 114 LA 113 oO ge gt 2 gt 0 Q D 22 23 www ListenTech com Listen Technologies Corporation 8535 South 700 West Suite A Sandy Utah 84070 2515 USA Telephone 1 801 233 8992 Toll Free North America 1
17. he SQ feature enabled to achieve the desired results SQ is available on new Listen systems including the system you received in this shipment If you are planning to use this product with older Listen systems that do not have Listen SQ or equipment not manufactured by Listen you should 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 reasons 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 manu facturers 3 You expect that end users may bring and use their own receivers that don t have the SQ function SQ Summary Improves noise perform ance by at least 20dB SQ is NOT compatible with older version Listen products SQ is NOT compatible with other manufacturers products SQ is NOT squelch To work properly SQ must be enabled for both the transmitter and receivers SQ can be disabled to per mit operation with older Listen products or other manufacturers products Channel Selection It is important to choose channels that are free from interference to achieve proper operation of your Listen equipment This process is trial and error Before turning on the transmitter listen to the wide band channels lettered channels at 72MHz and channels that start with a 2 for 216
18. ing conditions NOTE There are many varieties of 50 Ohm RG58 and RG8 cables You may purchase a cable that is better or worse than this value Please check with the cable vendor or manufacturer for exact specifications 11 Q O Oo X 2 Q Q ie D 72MHz Compatibility Chart Frequency Phonic MHz Listen Ear Comtek Phonak Wiliams Gentner Telex Drake E je Xt O gt O Q e O N I FN 72 0250 1 1 1 Al 1 1 72 0500 O 1 72 0750 2 2 2 A2 2 3 72 1000 A A A AN AG3 2 A 721 72 1250 3 3 3 A3 14 5 72 1500 6 3 72 1750 4 4 4 A4 15 2 72 2000 K K K K K 8 4 B 72 2 72 2250 5 5 5 K5 16 9 72 2500 10 5 72 2750 6 6 6 K6 07 1 72 3000 B B B B B 18 12 6 C 72 3 72 3050 7 7 7 B7 1913 72 3500 14 7 72 3750 8 8 8 B8 Q015 72 4000 N N N N N 16 8 D 724 72 4050 9 9 9 No 2L1 72 4500 18 9 72 4750 0 0 0 NO Q2 19 72 5000 e C e C 23 20 0 E 72 5 72 5050 1 1 1 CI 24 21 72 5500 22 1 72 5750 2 2 2 C2 0533 72 6000 S o S O 2 F 726 72 6050 3 3 3 O2 26 25 72 6500 26 3 72 6750 4 4 4 4 27 72 7000 D D D D D 28 4 G 72 7 72 7250 5 5 5 D5 29 72 7500 30
19. isten s Frequency Compatibility Tables pages 12 13 Adjust Listen s transmitter to the same frequency as the other major brand Since Listen products can access 57 channels they will most likely receive on the same fixed channel or channels of other major brands If you are using another brand of receiver make sure you have turned off the SQ feature on the Listen product s There is not sufficient range First make sure that the receivers you are using are operating properly then make sure that you have an antenna connected either to the top of the LT 800 transmit ter or connected to the back of the unit but not both The antenna should be as high as possible and free of obstacles In addition make sure you are using the cor rect antenna type for your unit You might want to use a remote antenna provided by Listen that can be mounted on a mast or wall Try using different frequencies to find one with less interference There is interference in my transmission Ensure that the transmitter and receivers are on the same channel Verify that there are no other transmitters on the same channel or a close channel to the one exhibiting interference Try different channels until you find a clear channel If this does not work try a different frequency band i e if you are using 72MHz try 216 MHz or vice versa Please contact Listen support for assistance and a return authorization RA number to exchange product no charge for alternate freque
20. kage Contents Listen Part Number LT 800 Stationary Transmitter 72MHz or 216MHz 72 MHz LT 800 072 LA 201 120 VAC Power Supply 216 MHz LT 800 216 LA 121 BNC Adapter 72MHz model only Warranty Card User Manual Optional Accessories See page 18 Listen and the Listen Logo are registered trademarks of Listen Technologies Corporation LT 800 2004 01 18 2004 Listen Technologies Corporation All Rights Reserved Table of Contents Architectural Specifications 2 SDECI ICBEIOTIS zi auri pe P E tt Rr e e de o e e leot s 2 Block Diagram 4 3 Quick Reference rcc Re PULS EI Pru vue Re eei aee gus 4 Set p Instr ctlons ccc ober Uere Mos EAM ES Od ICI EE 5 AUE Control o ae Pub e ir a bae ce pente ao C OP dre red 6 Operating Instructions er Lee CLE oy en ted px RI RI ees 7 Transmission 7 lasten SOM RD Re oe oe lay ba ade Ba E Poke eh eee 8 Channel Selector EE sd et ed Wie hed e Sd veces cd 9 RF Reception Maximization Strategies 10 Coaxial Cable iere pP Sabb RE PIG EPI REA 11 72 MHz Frequency Compatibility Table eese 12 216 MHz Frequency Compatibility Table 13 Troubleshooting s seiis thc pel wx pee ERI ME I
21. n cy equipment End users are adjusting the unit First lock the channel by pressing the UP and DOWN buttons simultaneously for 5 seconds Consider removing the INPUT MIX LEVEL and CONTOUR knobs You can order from Listen a rack mount kit and security cover that will limit access to the unit If you are using other manufacturers receivers and the sound is dis torted It is probably because the receiver is not designed to handle the 25kHz deviation of the Listen transmitter This can be corrected by turning the Mix Level knob down Another possibility is that you have enabled the SQ function of the LT 800 and this feature is not available in other companies products You will need to dis able SQ in this event see page 5 Several transmitters operating in the same environment For this you ll need to choose your transmitting frequencies carefully See page 9 for more details Can I have two antenna s connected to my transmitter The LT 800 transmitter can use only one antenna connection at a time You may connect either a top mount antenna through the top antenna port or a remote antenna connected to the BNC connection on the rear of the unit If antenna s are simultaneously connected to both ports the transmitter will have extremely poor broadcast performance and range 15 e en D gt e 4 a 2 z O en 9 Q E O O 16 Compliance Notice This device complies with par
22. n This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interfer ence to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures 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 been certified to comply with the limits for a class B computing device pursuant to FCC and IC Rules In order to maintain compliance with FCC and IC regulations shielded cables must be used with this equip ment Operation with non approved equipment or unshielded cables is likely to result in interference to radio and TV reception The user is cautioned that changes and modifications made to the equipment without the approval of man ufacturer could void the user s authority to operate this equipment Warranty Listen Technologies Corporation Listen warrants the LT 800 Stationary Transmitter to be free from defects in workman
23. nector contains a mix of Set switch to match your INPUT 2 source The level in CHANNEL SELECT TO LOCK CHANNEL press UP and DOWN buttons simultaneously and hold for 5 seconds Press both and hold again to unlock tion adjust INPUT 1 Used for balanced connection of a microphone or line level input This combina tion connector accepts either website for details on antennas INPUT 1 and INPUT 2 This is an the LINE position is 10dBu y that can be attached here unbalanced phono connector and in the SPEAKER posi ADOT Ae plane plugs the output level is 10dBu tion itis 10dBu AUX ANTENNA POWER INPUT INPUT 1 INPUT RF POWER SPKR LINE nee LINE 4 MIC QUT 1 UI 15VAC 1 AMP Set RF Power level here 14 and Full See page 5 for guidelines on setting power levels INPUT 2 This unbalanced phono connector is used to connect an unbalanced high impedance line or speaker input The Listen LA 201 power supply connects here Select MIC or LINE input here for INPUT 1 Mic input level is 55dBu in the LINE position the input level is 4dBu LT 800 Setup Instructions Remove the product Remove outer packaging and plastic cover Inspect for physical damage Set SQ Switch The SQ switch comes in the ON position This is the recommended position Make sure receivers you are using have SQ on as well fac
24. s is too high the audio will be distorted This may happen if you are within 40 feet of the 216MHz transmitter Coaxial cable connectors and optional antenna mounting kits are available from Listen Visit www ListenTech com or ask your dealer for details Coaxial Cable The antenna for the L 1 800 can be mounted directly on the unit if desired However you may find that the unit will provide better performance when the antenna is located elsewhere If you plan to mount the antenna in a different loca tion than on the top of the unit you must use cable and connectors rated at 50 Ohms Although cable used for cable TV installations looks similar to this cable it won t work with your Listen system If you need to run cable over a greater length than 50 feet for 216MHz applications or greater than 100 feet for 72M Hz applications we recommend that you use RG 8 cable rather than RG 58 It is a lower loss cable meaning that more of your signal will reach the antenna Long cable runs can result in signal degradation due to loss characteristics of the cable At 72MHz there is an average loss of 2dB per 100 feet of cable and at 216MHz an average loss of 5 dB per 100 feet of cable A 3dB loss means half of your power has been lost However it is better to suffer coaxial power loss than to try to shoot your signal through obstacles Obstacles especially metal can create drop outs or reflections of your signal that will result in poor listen
25. ship and material under normal use and conditions for the useful lifetime of the product from date of purchase This warranty is only available to the original end purchaser of the product and cannot be transferred Warranty is only valid if warranty card has been returned within 90 days of purchase This warranty is void if damage occurred because of misuse or if the product has been repaired or modified by anyone other than a factory authorized service technician Warranty does not cover normal wear and tear on the product or any other 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 disclaims and negates any warranty of merchantability or fitness of use of such equipment including without limitation any warranty that the use of such equipment for any purpose will comply with applicable laws and regulations The terms of the warranty are governed by the laws of the state of Utah USA Listen will only accept returned products with prepaid shipping and with a return authorization number To receive a return authorization number call 1 800 330 0891 or 1 801 233 8992 Please see www ListenTech com or contact Listen for complete warranty details 17 Q Q 4 lt Optional Accessories Oth
26. ss end to end System Frequency Response 63Hz 15kHz 3dB 63Hz 10kHz 3dB System Signal to Noise Ratio A weighted System Distortion lt 2 total harmonic distortion THD at 80 deviation Rear panel Female XLR and in combo connector balanced 55 0dBu Audio Input 1 mic line nominal input level adjustable 30 21dBu mic line maximum impedance 1k 20k Ohrns line mic Rear panel One Phono connector unbalanced 10 10dBu line speaker nominal input level adjustable 30dBu maximum impedance 100k Ohms Rear panel One Phono connector unbalanced OdBu nominal output level 19dBu maximum impedance 10 Ohms Front panel One 3 5mm connector unbalanced adjustable output level 14dBu 250mW maximum impedance 32 Ohms SQ enabled 80dB SQ disabled 60dB SQ enabled 80dB SQ disabled 50dB Audio Input 2 Combined Audio Output Mix Headphone Output RF Power Selection Rear panel Full 4 see Output Power above Set up Controls Front Panel Input level mix level modulation contour equalization Controls set Clantroli RF power test tone channel UP and DOWN Input 1 line or mic level Input 2 speaker or line level Channel selection can be locked by holding the UP and DOWN button 5 seconds Input VU Meter Dual Ten step LED eight green two red Mix VU Meter Ten step LED eight green two red RF Power Four step green LED Power Green LED illuminates when the unit is powered up LCD Display
27. t 15 of the FCC Rules Operation is subject to the following two conditions 1 These devices may not cause harmful interference and 2 these devices must accept any interference received including interference that may cause undesirable operation Listen s LT 800 Transmitter 216MHz only Listen s LT 800 transmitter is authorized by rule under the Low Power Radio Service 47 C ER Part 95 and must not cause harmful interference to TV reception or United States 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 enforcement tracking services under agreement with a law enforcement agency or automated maritime telecommunications system AMTS network control communications Two way voice communications and all other types of uses not mentioned above are expressly prohibited CAUTION Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate Listen s equipment FCC Statement This equipment has been tested and found to comply with the limits for a class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residen tial installatio
28. tory default See page 8 for an explanation of SQ Remove the rubber plug from the top of the unit In a good light locate the SO switch through the antenna opening in the top of the unit The switch is located next to the antenna connector inside the unit Move the switch toward the front of the unit to enable SQ move the switch toward the back of unit to disable SQ Top View of LT 800 SQ Switch Location T O Antenna Opening Disabled Enabled Front panel of LT 800 oo Mg Note If you will be using your LT 800 with receivers that do not have SQ capability disable the SQ feature For rack mounting If rack mounting the unit install the optional rack mount kit part LA 326 according to the instructions included with the kit then install the LT 800 in the rack Rack Mount with dual unit installed Shown with LR 100 and LT 800 6649 e Rack Mount with single unit installed Shown with LT 800 Connect power supply to unit Plug the power supply into the power connector on the back panel Do not connect to AC power yet Only use a Listen approved power supply The LA 201 an in line transformer is the approved power supply for this unit Connect antenna Connect the antenna not included according to the installation instructions Only use an antenna supplied by Listen If you are connecting the antenna dire
29. vel Input levels can be viewed on the two VU meters on the front panel LT 800 Audio Control 1 LUI Listen as PP Commer T RF POWER MIX LEVEL CONTOUR POWER TESTTONE Adjust input Adjust the INPUT knob counterclockwise to add gain to INPUT 1 This will decrease gain to input 2 Adjust INPUT knob clockwise to add gain to INPUT 2 This will decrease gain to input 1 If you have two audio sources connected to both INPUT 1 and 2 adjust the level of one input using the VU meter then adjust the output level of the other audio source Adjust the audio level so that the first VU meter does NOT peak in the red Adjust Contour Adjust the CONTOUR knob counterclockwise if your audio source is mostly voice Adjust the knob clock wise if your audio source is mostly music The CON TOUR knob adjusts the relative equalization of the unit This equalization boosts or cuts frequencies above 5kHz Adjust Mix Level Adjust the mix level knob so that the audio level on the right VU meter occasionally peaks red This is the level adjustment for the combined output from Input 1 and Input 2 Operating the LT 800 ap Power unit on Select a channel Select the transmit channel by pressing the channel UP and DOWN buttons See Channel Selection on page 9 for more information MONITOR p P mie RFPOWER CH Es TA e MIX LEVEL CONTOUR 6 UP and DOWN buttons CHANNE
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