Listen Technologies LT-800-150 Satellite Radio User Manual
Contents
1. ONO listen 7 N E 1 i Le re ES Oo J listen 3 EE SH oO oO DAS GE gt o 20 o oO Rack Mount with dual unit installed Rack mount with single unit installed Shown with LT 800 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 directly 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 19 for antenna options or refer to the Listen website for remote antenna A Se options www listentech com Coax antenna connection Rear of LT 800 shown nut oe Kay ANTENNA LA 132 Remote Antenna See RF Reception Maximization o N LG E Strategies and Coaxial Cableon Q S page 13 rubber plug LT 800 shown with top mount antenna connected through top of unit part number LA 134 Connect Power Plug the power supply into the power connector on the back panel then plug the power supply into an outlet Only use a Listen approved power supply The LA 207 an in line switching power supply isthe approved power supply for this unit 50 Ohms ANTENNA LF 800 Setup Instructions cont Set SQ Super Quiet and Process Features Your t2. Channel Select UP and DOWN buttons Lock on Channel Once you determine your transmit channel you can lock the transmitter on that channel To lock on a channel hold the Channel Select Up button for 3 seconds until the padlock icon appears on the display To unlock repeat this process and the padlock icon will disappear Lock icon ES 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 Press Test Tone button here LT 800 Audio Control Adjust Audio Input Level 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 input level until the left VU meter s occasionally illuminate the red LEDs Illumination of the red LEDs indicates the unit is in limiting Limiting is required so that the unit does not over modulate the transmitter If you don t want any audio limiting to occur make sure the red LEDs never illuminate If you want a highly limited signal tum the audio gain up so the red LEDs illuminate often TEST TONE Adjust Mix Level Adjust the mix level until the right VU meter occasionally illumi
3. Microphone Microphone Presentation Style NOTE To use Listen microphones you must use a converter LA 280 to adapt the 3 5 mm connection to a 1 4 phono connection Notes 21 22 Notes Notes 23 Li 1 Lifien amp www listentech com Listen Technologies Corporation 14912 Hentagecrest Way Bluffdale Utah 84065 4818 U S A 1 801 233 8992 1 800 330 0891 North America 1 801 233 8995 fax www listtentech com Printed in China 2009 Listen TechnologiesCorporation All Rights Reserved 09162009
4. phono connector Input 2 hastwo unbalanced mixing phono connectors Use Input 1 if you are using a microphone or if you have a balanced connection such asfrom a professional audio mixer you Can also use Input 1 for unbalanced connections Use Input 2 to connect to an unbalanced audio source Input 1 Input 1 offersa choice of balanced XLR or 1 4 phono connector INPUT1 Line LINE MIC MIC PH PWR Back of LT 800 with XLR connected to Input 1 II Plug your microphone into Input Land move wur the input select switch to Mic for dynamic Mic microphones or Mic PH Power for condenser TE re microphones A m Mic with Plug yourbalanced orunbalanced audio source Phantom E into Input 1 Use the following diagram ST XLR Winng 1 4 Phone Wiring Ring Sleeve NS Input from Balanced Unbalanced Audio Audio Source Source AA Audio f A Tip Ring PS Tip Ring Sleeve Balanced Unbalanced Audio Audio Source Source Input 2 Plug your unbalanced audio source into Input 2 and select the audio level switch for 10 dBu or 10 dBu to match the audio level coming from your equipment LI 800 Operating Instructions Power Unit On Tum power on by pressing the power button cA Select a Channel Select the transmit channel by pressing the channel select UP and DOWN buttons See Channel Selection on page 14 for more information MONITOR Oz CHANNEVSELECT
5. to handle Make sure the SQ mode is set correctly on both the LT 800 and the receivers you are using If your receivers do not have SQ make sure the SQ mode istumed off see page 8 There is hum in the audio Make sure you have propery 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 balanced audio source this will reduce the chance of creating hum Connecta ground wire from the LT 800 to ground and or to the ground of the source audio There isa tone The Test Tone button has been pressed its LED light is on Push the Test Tone button to tum off the tone The Audio Input 1 sounds tinny If you are using an unbalanced audio source make sure Pin 3 on the XLR orthe ring on the Ya plug isgrounded see page 9 cannot pick up the signal on the receiver Checkto make sure that they are on the same channel Make sure the LT 800 has an antenna connected Ensure that the receiver hasan antenna for portable products the headset isthe receiving antenna I 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 channel lt sa good idea to lock the channels once they have been set To lock the LI 800 press the UP button for 3 seconds see page 10 LI 800 Troubleshooting cont Troubleshooting There is not sufficient range First make sure that the receiver
6. Listen user s Manual www listentech com E e f j 3 N ten INPUT MONITOR 1 P e Hi ret en mi INPUT LEVELS MX LEVEL CONTOUR TEET TOME CHANNEL EELEST LT 800 FM transmitter LT 800 150 Stationary FM Transmitter iss a single sound DearValued Customer Thank you forchoosing Listen Allof usat Listen are dedicated to providing you with the highest quality products available We take great pnde in their outstanding performance because we care that you are completely satisfied That s why we independently certify them to the highest quality standardsand back them with a limited lifetime guarantee We stand ready to answer any questions you might have during installation or in the operation of our products Should you expenence any problems whatsoever with your Listen products we are ready to help you in any way we can with prompt efficient customer care Because at Listen it s all about you And 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 1 801 233 8992 1 800 330 0891 north America 1 801 233 8995 fax support listentech com www listentech com Thank you and enjoy your listening experience Best regards Russell Gentnerand the Listen Team e In the few instances where repairs were needed 99 of all clients indicated that they were happy with repairtum around timesand 85 of the time clients were with
7. al output The device shall have the following audio controls input level mix level and an adjusta ble low pass filter contour The device shall have an audio processorthat is capable of automatic gain control and limiting The Listen LT 800 150 is specified Spec ific ations RF Frequency Range 150 8000 MHz 152 3500 MHz Numberof Channels 6 wideband 26 narowband Number of Simulta neous Tra nsmitte rs Frequency Accuracy 005 sta bility 32 to 1222 0 to 50 C Transmitter Sta bility 50 PPM Transmission Range Up to 762 m 2500 ft Output Power 100 mW System Frequency Response 50 Hz 15 kHz 3 dB SQ enabled 80 dB SQ disabled 60 dB System Distortion lt 2 total harmonic distortion THD at 80 deviation System Signal to Noise Ratio Audio Input 1 Rear panel one 1 Female XLR and 1 4 in combo connector balanced 0 55 dBu line mic nominal input level adjustable 30 21 dBu line mic maximum input level impedance 20k 1k ohms line mic phantom power 12 VDC Audio Input 2 Rear panel two 2 phono connectors unbalanced 10 10 dBu nominal input level adjusta ble 30 dBu maximum impedance 100k ohms Audio Processing Process Compression can be tumed on off Sope intemally adjustable from 1 1 to 4 1 Default 2 1 Contour Cutsand boosts frequencies above 5 kHz Combined Audio Output Mix Input 1 and input 2 mixed output rear panel two 2 phono connectors unbalanced 10 dBu nominal output level 15 dBu m
8. anel Connections amp Settings Input 2 Set switch to Input 1 Used for balanced Remote Antenna Connection Mix Output These connectors Match the level of your GE EE Don See page 19 or the Listen contain a mix of Input 1 and Input 2 audio source CHEN website for details on antennas Input 2 They are unbalanced Not used to increase or accente ether Xin ora that can be attached here phono connectors and the decrease level by 10 dBu Ana Kane output level is 10 dBu p HI POWER MIX NN INPUT OUTPUT RES INPUT 1 RF POWER a a 7 He S gee SI On mm 50 Ohms 12VDC 1 3A Select Line Mic or Mic Phantom ai pone ER Input 2 Connect Power Line is balanced 0 dBu Va Y2 and Full See bal d audi h level Mic is 55 dB page 8 for guidelines unbalanced audio to these input level Mic is u on setting power levels The Listen LA 207 phono connectors input 12 VDC supplied in PH Power l power supply level 10 dBu or 10 dBu position If not using input 1 leave connects here in line position 6 EE LF 800 Setup Instructions Unpack the Product Remove outer packaging and plastic cover Inspect for physical damage Mount in Rack if necessary 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 NOTE If rack mounting you will need to use a rear connection antenna
9. aximum impedance 10 ohms Headphone Output Monitor Front panel one 1 3 5 mm 0 14 in stereo connector unbalanced adjustable output level 3 dBu maximum impedance 10 ohms Rear Panel Input 1 Level Line Mic Mic Phantom Power Input 2 level 10 10 dBu RF power level low mid high Power Supply In line power supply Listen part number LA 207 Power Supply Input Input 100 240 VAC 50 60 Hz 0 4A Power Power Supply Output Output 12 VDC 1 3 A 15 6 W Power Supply Connector Output Connector 0 02 in 5 0 mm OD 0 01 in 2 5 mm ID barrel type Power Supply Compliance UL CE GS TUV RoHS Dimensions H x W x D 1775 x8 50 9 1310 4 5xX215x23cm Dark Grey with white silk screening Unit Weight 2 6 lbs 1 2 kg Physical Shipping Weight 6 lbs 2 7 kg Tempenature Operation 10 C 14 F to 40 C 104 F Environmental Temperature Storage 20 C 4 F to 50 C 122 F Oto 95 relative humidity non condensing Specifications are subject to change without notification LI 800 Bloc k Diagram Red W EE Q 3 5MM St CHANNEL SELECT Se 115VAC6 O O O Y 0 Hz E Up provided 15VAC 1A O HEADPHONE Power Supply O YN CPU Module O E Down X Volume Listen LCD Display Backlighted MIX Level Top Mounted VU Meter Compression Ratio Antenna Stud internal adjustment Remote Q Antenna Connection Transmitter RF Board Pre emphasis SQ Processing O Compandin BNC H g ANTENNA Green G
10. e only manufacturer using SQ Technology You expect that end users will bing and use their own receivers that don t have the SQ function NOTE See page 8 to enable or disable SQ Super Quiet Process Mode Process mode is used for Audio Gain Control AGC With the process mode enabled the LT 800 will automatically adjust for inconsistent Signal input levels by raising orlowenng the signal level accordingly to provide a consistent sound output level This feature should be used in applications where a consistent sound level is important and the input levels vary substantially Typically you would not want to engage the Process Mode when a speakers emphasis is cntical to the message they are conveying SQ Summary e SQ is NOT squelch e SQ improves noise performance by at least 20 dB e SQ is NOT compatible with older version Listen products e SQ is NOT compatible with other manufacturers products To work properly SQ must be enabled for both the transmitter and receivers e SQ can be disabled to permit operation with older Listen products or other manufacturers products RF Reception Maximization Strategies Forproperand dependable operation Listen receiversneed to receive a strong and consistent signal from the onginating transmitter Note that on portable receiversthe headset wire is the receiving antenna The following strategies should be used maximize to this signal EN When designing and i
11. hipment please contact the camer then contact Listen for replacement or repair requirements payable by the camer Listen scorporate headquartersare located in Bluffdale Utah U S A and are open Monday through Frida y 8am to 5pm Mountain Time 14912 Hentagecrest Way Bluffdale Utah 84065 4818 1 801 233 8992 1 800 330 0891 North America 1 801 233 8995 fa x support listentech com www listentech com Optional Accessones LA 132 Universal Antenna Kit Antenna Accessones LA 133 90 Helical Antenna 150 MHz SR LA 134 Telescoping Top Mounted Antenna 150 MHz LT 800 Rack Mount Accessones LA 135 Antenna Kit for Rack Mount LA 326 Universal Rack Mounting Kit Includes components for single and dual rack configuration and a secunty cover NOTE Rack mounted units cannot use the LA 134 top mounted antenna 19 20 Optional Accessones cont LA 112 RG 58 50 Ohm Coaxial Cable per ft Cable amp Connectors Accessones LA 113 RG 8 50 Ohm Low Loss Coaxial Cable per ft LA 127 RG 58 BNC Connector O LA 128 RG 8 BNC Connector Microphone Accessones LA 26 LA 262 LA 270 LA 274 Lavalier Microphone Over the Head Noise Canceling Hand Held Microphone Microphone Microphone s i TE of LA 276 LA 277 LA 278 LA 279 LA 280 Yain to 3 5mm Microphone Adapter for LT 800 LT 82 Behind the Head Microphone Collar Conferencing l Over the Ear Microphone
12. nates the red LED This is the level adjustment forthe combined output from Input 1 and Input 2 Adjust Contour Adjust the Contour knob counterclockwise if your audio source is mostly voice Adjust the knob clockwise if your audio source is mostly music The Contour knob adjusts the relative equalization of the unit This equalization boosts or cuts frequencies above 5 kHz Listen SQ Super Quiet Improving Your Listening Experience People 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 minimize noise Listen uses a noise reduction technology called ListenSQ Both the transmitter and receiver must have the SQ feature enabled to achieve the desired results SQ isavailable 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 must disable Listen SQ Your Listen LT 800 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 a You are using your new Listen LT 800 with older version Listen receiversthat do not have the SQ function You are using your new Listen LT 800 with equipment supplied by other manufacturers Listen isth
13. nection on the rear of the unit If multiple antennae are simultaneously connected to both ports the transmitter will have extremely poor broadcast performance and range Warranty amp Contacting Listen Warranty Listen Technologies Corporation Listen warrants its transmitters and receivers LT 82 LT 700 LT 800 LR 42 LR 44 LR 400 LR 500 to be free from defects in workmanship and materal under normal use and conditions for the useful lifetime of the product from date of purchase Listen warrants its Stationary IR Radiators LA 140 to be free from defects in workmanship and materal under nomal use and conditions for three years from the date of purchase Listen warrants its Noise Canceling Microphone LA 270 to be free from defects in workmanship and matenal under normal use and conditions for one year from date of purchase Listen wa mants its Charging Canying Cases LA 306 LA 311 LA 313 LA 317 LA 318 LA 319 LA 320 LA 321 LA 322 LA 323 LA 324 LA 325 to be free from defects in workmanship and materal under normal use and conditions for one yearfrom date of purchase All otherproductsand accessones are warranted for 90 da ys from date of purchase This warranty is only available to the original end purchaser of the product and cannot be transfered Warranty is only valid if waranty card has been retumed within 90 da ys of purchase This waranty is void if damage occurred because of misuse or if the product has been repai
14. nels 1 6 Wide Band Channels 7 32 Narrow Band Channels 150 MHz Frequency Chart 06 151800 o8 iso9s0 o9 151000 0 LI 800 Troubleshooting Troubleshooting The LF800 has no power Make sure the LA 207 power supply is connected to a power source and isconnected to the jack marked Power Input Make sure the POWER button is pressed in There is no audio orthe audio level is wo low Make sure that your audio source isproperly connected to Input 1 and or Input 2 The Input 1 or Input 2 switches must be in the correct position forthe appropnate input level For example if you are using the output of a mixer on Input 2 the switch should be in the 10 dBu position If it were to be in the 10 dBu 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 You can listen to the audio source by connecting a headset to the front panel jack and adjusting the Monitor volume control If the level of audio into the transmitter islow and can t be corrected using the level input switches the audio processorcan be tumed on to boost the signal see page 8 to set page 12 for descnption of Process Mode The audio is distorted Check to make sure you have the input level select switches in the proper position You may be providing too much audio level forthe input stage
15. nstalling your system keep in mind that the location of both the transmitting and receiving antennas is critical to maximize broadcast range bs Eliminate or minimize obstructions between the transmitting and receiving antenna ES Minimize the distance between the transmitting and receiving antennas ES Move transmitting and receiving antennas away from metal or conductive objects ea Place the transmitting antenna as high as possible ES Onent both transmitting and receiving antennas vertic ally Position the RF Power switch on the back of the LT 800 to full RF Power unless lower power is acceptable see page 8 ES Keep coaxial cable from transmitter to antenna as short as possible CAUTION When installing antennas ensure the antenna is clear of power lines Coaxial cable connectors and optional antenna mounting kits are available from Listen See page 19 20 visit www listentech com or ask your dealer for details Coaxial Cable The antenna for the LT 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 location other than 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 will not work with your Listen system If you need to run cable overa length greater than 75 feet for 150 MHz ap
16. out their product for lessthan 10 days Overall client satisfaction of working with Listen wasrated 4 8 out of 5 Please continue with yourexcellent attitude toward customer satisfaction You guys are great Pve never had such good service from any company Keep up the good work You stand behind your product wonderfully Assistive Listening e Language Interpretation Soundfield e TourGroup Conferencing LT 800 Table of Contents Package Contents 150 MHz Specifications Block Diagram Quick Reference Setup Instructions Operating Instructions Audio Control 11 Listen SQ Super Quiet 12 RF Reception Maximization Strategies 13 CoaxialCable 13 Channel Selection 14 150 MHz Frequency Chart 15 Troubleshooting Warranty Contacting Listen Optional Accessones LT 800 Package Contents LF 800 Contents Listen Part Number e LT 800 150 150 MHz LT 800 150 150 MHz e 12 VDC Power Supply e User Manual e Quick Reference Card Optional Accessories See pages 19 20 LF 800 Specifications Architectural Specific ations The stationary FM transmitter shall be capable of broadcasting on 32 channels The tra nsmitter shall have an SNR of 80 dB or greater The output power shall be adjustable to quarter half or full Channel tuning shall be capable of being locked The device shall have an audio frequency response of 50 Hz to 15 kHz dB It shall have two 2 mixing audio inputs and a mixed sign
17. plications orto maxi mize broadcast range Listen recommends that you use RG 8 cable rather than RG 58 RG 8 isa lower loss cable meaning that more of your signal will reach the antenna Long cable runs can result in signal degradation due to the loss charactenstics of the cable When using RG 58 with a 150 MHz transmitter there isan average loss of 6 dB per 100 feet of cable A 3 dB 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 listening conditions NOTE There are many vaneties of 50 ohm RG 58 and RG 8 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 Channel Selection It is important to choose channels that are free from interference to achieve proper operation of your Listen equipment This process is tral and enor Before tuming on the transmitter listen to the wide band channels on the receivers channels 1 6 Listen to the audio through the headphone orvia the speakerand choose a channel with the least amount of interference Unless you are interfacing with an existing namowband transmission system always use a wide band channel If you are using multiple channels follow this process 1 Same Space If you are using mul
18. ransmitter is shipped to you with SQ super quiet enabled and Process disabled For a detailed description of these features and when to use them please referto page 12 To Disable or Enable SQ and Process Features With the unit on pressand hold the channel select Down button for 8 seconds The program PGM icon will appear on the LCD Once in the program mode the SQ and Process features can be tumed on and off by pressing the channel select buttons Press the channel select Up button to toggle between Process On and Off Press the channel select Down button to toggle between SQ On and Off LED lit when Process is enabled If the green LED is illuminated on the front panel that feature is enabled Once you have enabled or LED lit when disabled the features as desired let the transmitter ii exit the program mode by waiting 5 seconds Set RF Power Set the RFPOWER switch on the back of the unit to 1 4 1 2 Full Level is indicated on the LCD display The amount of transmitted RF power that you will need depends on your application If you are operating multiple tra nsmitters in the same environment it is best to set the tra nsmitters output power to its lowest level to reduce the possibility of interference LT 800 Setup Instructions cont Connect Audio Inputs The LT 800 has two audio input options Input 1 and Input 2 Input 1 isa balanced connection using either an XLR or 1 4
19. red or modified by anyone other than a factory authorized service technician Warranty does not cover nomal wearand tearon the product orany other physical damage unlessthe damage wasthe result of a manufacturing defect Listen is not lia ble for consequential damages due to any failure of equipment to perform asintended 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 wananty of merchantability or fitness of use of such equipment including without limitation any waranty that the use of such equipment for any purpose will comply with applicable laws and regulations The terms of the warranty are govemed by the laws of the state of Uta h In the first ninety days after purc hase any defective product will be replaced with a new unit After 90 days Listen will at its own discretion either repair orreplace transmitters and receivers with a new unit ora unit of similartype and condition Product that isnot covered under warranty shall be repaired orreplaced with a unit of similar type and condition based ona flat fee Contact Listen for details This limited warranty pncesand the specifications of products are subject to change without notice Contacting Listen If technical service isneeded please contact Listen Pre authonzation is required before retuming Listen products If products were damaged in s
20. reen E MIX LEVEL e EE EE i ff Functions controlled by the CP Low 4 High On U Off OH W S i Module Lk RF POWER SQ CONTOUR PROCESS Input 1 VU Input 2 VU Meter Meter 12VDC AR AAA ARA Input 1 Level Select Mic Phantom Pwr Mic Line Mic AN Line AO M Input 2 Level Select 2 EE 10dBu 10dBu 0 o N 10dBu 10dBu Front Panel ae a IH Y y E INN Female XLR 1 4 Combo Connect Phono Phono 2 Tip 3 Ring 1 Sleeve E INPUT 1 INPUT 2 MIX OUTPUT TEST TONE LT 800 Quick Reference L e F Top mount antenna connection LT 800 Front Panel Controls amp Displays nn nn antenna in place is active Indicates audio input Indicates EE Monitor Port Plug Las level of Input 1 and Shows Super Quiet dor lodo yaaa E Adjust audio input level head d J put levels lacie mode is active is selected In a heaaset an of Input 1 and Input 2 pote mixed audio adjust volume here See page 11 for level n more information Ge az L INPUT MONITOR Listen nn ee wm mm O eis Sr POWER TEST TQNE CHANNEL SELECT Power Mix Level Adjust so ON OFF the Mix Level meter Channel Select Down Test Tone Activates occasionally lights Contour Equalization Channel Select Up Press for 8 seconds to a tone to aid system the red LED adjustment Turn nn u 3 seconds enter program mode zur counter clockwise for ao current See page 8 for more voice and clockwise for information music LT 800 Back P
21. s you are using are operating properly then make sure that you have an antenna connected either to the top of the LT 800 transmitter 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 correct antenna type for your unit You might want to use a remote antenna provided by Listen that can be mounted ona mast or wall Try using different frequencies to find one with less interference There ts interference in my transmission Ensure that the transmitter and receivers are on the same channel Venfy that there are no other transmitters on the same channel ora close channel to the one exhibiting interference Try different channels until you find a clear channel End users are adjusting the unit First lock the channel by pressing and holding the channel select UP button for 3 seconds Consider removing the Input Mix Level and Contour knobs You can ordera rack mount kit from Listen which offers a security cover that will limit access to the unit Several transmitters are operating in the same environment For this you ll need to choose your transmitting frequencies carefully See page 13 15 for more details Can I have two antennas connected to my transmitter No The LT 800 transmitter can use only one antenna connection ata time You may connect either a top mount antenna through the top antenna port ora remote antenna connected to the BNC con
22. tiple transmitters in the same space the most number of channels that will work simultaneously is six at 150 MHz With all of the transmitters off listen for interference on allthe wide band channels via the headphone jackona Listen receiver Using the frequency chart on page 15 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 2 Distributed Spacing f you are using transmitters that are spread out over space you can achieve more simultaneous broadcast channels However it is critical that your receivers be located as close to its transmitter as possible You can use adjacent channels see frequency chart on page 15 in thiscase aslong as the adjacent channel transmitter is at least 50 further away from the receiver as its transmitter It is highly recommended that after channel selection hasbeen achieved you lock the channel so that it cannot be changed by the user To accomplish LOCK on the LT 800 press the UP button for 3 seconds Repeat the processto unlock 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 manufacturers Wide band channels have lower noise than their narrow band counterparts 150 MHz The LT 800 150 MHz operates on 6 wide band channels and 26 narrow band chan
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