Dear Valued Customer, Thank you for choosing Listen! All of us at Listen are dedicated to providing you with the highest quality products available. We take great pride in their outstanding performance because we care that you are completely VDWLVÀHG 7KDW·V ZK\ ZH LQGHSHQGHQWO\ FHUWLI\ WKHP WR WKH KLJKHVW TXDOLW\ standards and 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.
Design Guide FM Technology Overview System Overview .
FM Technology Overview System Overview .
Design Guide Frequency Modulation (FM) Technology Overview )UHTXHQF\ PRGXODWLRQ )0 LV D PHDQV RI WUDQVPLWWLQJ DXGLR XVLQJ HOHFWURPDJQHWLF ZDYHV This same technology is used by local FM radio stations to broadcast voice and music. FM signals can travel WKURXJK PRVW EDUULHUV ² ZDOOV ÁRRUV DQG FHLOLQJV 7KH GLVWDQFH D VLJQDO WUDYHOV KDV PDQ\ GLIIHUHQW YDULDEOHV VXFK DV 5DGLR )UHTXHQF\ 5) RXWSXW SRZHU WKH W\SH DQG SODFHPHQW RI WKH DQWHQQD DQG WKH EURDGFDVWHG frequency.
Design Guide System Overview 7KHUH DUH WKUHH PDLQ SDUWV WR D 3RUWDEOH )0 6\VWHP ² ,QSXW VRXUFH WUDQVPLWWHU DQG UHFHLYHU /$ %HKLQG WKH +HDG 0LFURSKRQH RWKHU PLFURSKRQHV DYDLODEOH /7 Portable Display FM 7UDQVPLWWHU 0+] /5 Portable Display FM 5HFHLYHU 0+] /5 Portable Programmable 'LVSOD\ )0 5HFHLYHU 0+] Input Source $ PLFURSKRQH LV WKH PRVW FRPPRQ LQSXW VRXUFH IRU WKH /7 WUDQVPLWWHU DOWKRXJK WKH /7 FDQ WUDQVPLW WZR DXGLR LQSXWV DW RQFH RQ RQH WUDQ
Design Guide System Overview Transmitter 7KH /7 PRGXODWHV WKH DXGLR RQ DQ )0 FDUULHU DQG WUDQVPLWV WKH VLJQDO YLD DQ DQWHQ na on the unit. /7 Portable Display FM 7UDQVPLWWHU 0+] Receivers Listen offers two different portable receivers.
Design Guide Key concepts in designing a portable FM system Channel Selection Use this section of the guide to choose the channel settings for the transmitter and receivers. 7KH JRDO LV WR ÀQG D WUDQVPLVVLRQ FKDQQHO V WKDW LV IUHH IURP LQWHUIHUHQFH ,QWHUIHUHQFH RULJLQDWHV IURP RWKHU WUDQVPLWWHUV DQG IURP RWKHU HTXLSPHQW VXFK DV D FRPSXWHU /LVWHQ SURGXFWV RIIHU GLIIHUHQW FKDQQHOV WR FKRRVH IURP 7KLV LQFUHDVHV WKH FKDQFH \RX·OO ÀQG DQ interference free channel.
Design Guide Key concepts in designing a portable FM system Eliminating Multipath As mentioned on page 5, multipath can occur with portable RF systems. The audio quality of the transmission can decrease with the occurrence of multipath. Here are a few potential improvements that FDQ KHOS LI PXOWLSDWK WDNHV SODFH Squelch Squelching the receiver will mute the audio output when the signal from the transmitter is turned off or the signal is too weak to be received.
Design Guide Notes 10
Design Guide Notes 11
LT-700 User’s Manual Table of Contents 6SHFLÀFDWLRQV %ORFN 'LDJUDP Quick Reference 6HWXS ,QVWUXFWLRQV 2SHUDWLQJ ,QVWUXFWLRQV 3URJUDPPLQJ ,QVWUXFWLRQV Accessories Notes 19 28 29 LT-700 LT-800 LT-700 Package Contents /7 • Quick Reference Card • Warranty Card • FM Manual Card /7 Portable Display FM 7UDQVPLWWHU 0+] /LVWHQ &RQÀJXUDWLRQV /7 15
/7 6SHFLÀFDWLRQV $UFKLWHFWXUDO 6SHFLÀFDWLRQ 7KH /7 SRUWDEOH )0 7UDQVPLWWHU VKDOO EH FDSDEOH RI EURDGFDVWLQJ RQ FKDQQHOV &KDQQHO WXQLQJ VKDOO EH FDSDEOH RI EHLQJ ORFNHG 7KH WUDQVPLWWHU VKDOO KDYH D 615 RI GE RU JUHDWHU 7KH RXWSXW SRZHU VKDOO EH DGMXVWDEOH WR TXDUWHU KDOI RU IXOO 7KH GHYLFH VKDOO KDYH DQ DXGLR IUHTXHQF\ UHVSRQVH RI +] WR N+] G% 7KH GHYLFH VKDOO LQFRUSRUDWH D PLFURSKRQH VHQVLWLYLW\ VZLWFK 7KH GHYLFH VKDOO LQFRUSRUDWH D PXWH VZLWFK 7KH XQLW VKDOO XWL
LT-700 Block Diagram Up LCD Display Down Power Supply CPU Module 115/230VAC 50/60 Hz Universal Power Supply (not included) Power 7.
LT-700 Quick Reference PP ,QSXW -DFN &RQQHFW D /LVWHQ PLFURSKRQH KHUH /(' :KHQ OLW LQGLFDWHV XQLW KDV SRZHU ZKHQ ÁDVKLQJ XQLW LV PXWHG FKDUJLQJ 0XWH 2Q 2II VZLWFK Articulating Flexible Antenna 3RZHU &KDUJLQJ 3RUt 3RZHU %XWWRQ 7XUQV SRZHU 2Q 2II Front Door Lock %DWWHU\ 6HOHFW 6ZLWFK &KRRVH the type of batteries being used. &KDQQHO 6HOHFW %XWWRQV &KDQQHO 'LVSOD\ 'LVSOD\V WKH FKDQQHO WKH /7 LV FXUUHQWO\ RQ. RF Output ,QGLFDWRU ,QGLFDWHV the RF transmit level.
LT-700 Setup Instructions 1 Unpack the Product 5HPRYH RXWHU SDFNDJLQJ DQG SODVWLF FRYHU ,QVSHFW IRU SK\VLFDO GDPDJH ,I GDPDJH LV DSSDUHQW SOHDVH contact the dealer from which the product was purchased or Listen Technologies &RUSRUDWLRQ WHFKQLFDO VXSSRUW IRU DVVLVWDQFH UHIHU WR SDJH IRU FRQWDFW LQIRUPDWLRQ 2 Open the front access door LT-700 LT-800 ,I ORFNHG XVH D SRFNHWNQLIH RU VPDOO VFUHZGULYHU WR XQORFN WKH GRRU ORFNV RQ ERWK VLGHV RI WKH XQLW To unlock the door, rotate the lock ¼ turn c
LT-700 Setup Instructions 4 Set Mic Sensitivity Switch The microphone sensitivity switch is located inside the battery compartment, to the left of the %$77(5< VHOHFWLRQ VZLWFK 7KH /7 LV VKLSSHG ZLWK WKLV VZLWFK LQ WKH FHQWHU 0(' SRVLWLRQ /LVWHQ UHFRPPHQGV WKH IROORZLQJ VHWWLQJV IRU RXU PLFURSKRQHV ,I \RX DUH XVLQJ D PLFURSKRQH IURP another vendor, you may need to experiment with different settings.
LT-700 Setup Instructions 6 Connect the Microphone LT-700 LT-800 The microphone jack is located on top of the unit. 7 Connect the Line Input Cable (Optional) 7KLV FDEOH DOORZV \RX WR FRQQHFW D 79 &' SOD\HU RU RWKHU HTXLSPHQW WR WKH /7 7R GR WKLV \RX PXVW RUGHU WKH /LVWHQ /$ /LQH ,QSXW &DEOH QRW LQFOXGHG ZLWK \RXU XQLW 7KLV FDEOH DOORZV \RX WR FRQQHFW ERWK D PLFURSKRQH DQG OLQH LQSXW WR WKH MDFN RQ WRS RI WKH /7 6HH WKH GLDJUDP EHORZ IRU FRQQHFWLRQ information.
LT-700 Operating Instructions 1 Turn Unit On 1A Power On/Off Button When you press the power button, the unit turns on. The LED on top of the unit will be illuminated and the LCD display will be visible. 2 Antenna Positioning Raise the antenna to the upright position. When the antenna if fully upright, it will click into position. LT-700 LT-800 NOTE: Be aware that the transmission range could decrease if the antenna is not in an upright position.
LT-700 Operating Instructions 7 Using the MUTE / TALK switch LT-700 LT-800 Slide the switch to the mute position and the microphone audio is muted.
LT-700 Programming Instructions Program Mode Overview 7KH /7 FDQ EH SURJUDPPHG WR WUDQVPLW RQ D OLPLWHG QXPEHU RI FKDQQHOV )RU DSSOLFDWLRQV ZKHUH XVHUV DUH UHTXLUHG WR VHOHFW D FKDQQHO VXFK DV FODVVURRPV RU ODQJXDJH LQWHUSUHWDWLRQ DSSOLFDWLRQ DQG \RX GRQ·W ZDQW WKHP WR KDYH WR VFUROO WKURXJK DOO RI WKH DYDLODEOH FKDQQHOV WKLV IHDWXUH LV LGHDO 7KH /7 FDQ DOVR EH FKDQJHG from high to low power levels. Adjusting the power settings allows you to set the range of the transmission.
LT-700 Programming Instructions 3 2QFH LQ WKH SURJUDP PRGH D IXQFWLRQ PHQX LV GLVSOD\HG )XQFWLRQ ) LV GLVSOD\HG DV GHIDXOW 3UHVVLQJ WKH channel up or down buttons will scroll through the functions. Pressing the power button will enter that function.
LT-700 Programming Instructions Resetting to defaults 7R UHVHW WKH WUDQVPLWWHU WR GHIDXOW VHWWLQJV IROORZ WKHVH LQVWUXFWLRQV 3 Reset to default settings 4A Press and hold the Up and Down channel buttons while turning the unit on. Press and hold the Up and Down channel buttons while turning the unit on. This will light up all segments of the display. 4B After the transmitter has been reset After the transmitter has been reset, the display will return with defaults present.
Accessories for LT-700 Accessories /$ /$ 2YHU WKH +HDG 0LFURSKRQH Z (DUSKRQH LT-700 LT-800 Lavalier Microphone /$ 2YHU WKH +HDG 0LFURSKRQH /$ Hand Held Microphone /$ %HKLQG WKH +HDG Microphone /$ Collar Microphone /$ Assistive Listening 1RWLÀFDWLRQ 6LJQDJH .
Notes LT-700 LT-800 29
LT-700 LT-800 Notes 30
LR-400/500 User’s Manual Table of Contents 6SHFLÀFDWLRQV %ORFN 'LDJUDP Quick Reference 6HWXS ,QVWUXFWLRQV 2SHUDWLQJ ,QVWUXFWLRQV 3URJUDPPLQJ ,QVWUXFWLRQV /5 RQO\ Accessories Notes 40 52 53 LR-400/500 Package Contents /5 • Quick Reference Card • Warranty Card LR-400/500 /5 Portable Display FM Receiver 0+] /5 Portable Programmable Displ
/5 6SHFLÀFDWLRQV $UFKLWHFWXUDO 6SHFLÀFDWLRQ 7KH /5 )0 UHFHLYHU VKDOO EH FDSDEOH RI UHFHLYLQJ RQ ZLGH EDQG FKDQQHOV ZLWK D 615 RI G% RU JUHDWHU 7KH GHYLFH VKDOO EH DEOH WR EH ORFNHG RQ D VLQJOH FKDQQHO 7KH UHFHLYHU VKDOO EH capble of seeking channels. The device shall have an adjustable squelch. The device shall have an DXGLR IUHTXHQF\ UHVSRQVH RI +] WR .
/5 6SHFLÀFDWLRQV $UFKLWHFWXUDO 6SHFLÀFDWLRQ 7KH /5 )0 UHFHLYHU VKDOO EH FDSDEOH RI UHFHLYLQJ RQ ZLGH EDQG FKDQQHOV ZLWK D 615 RI G% RU JUHDWHU 7KH UHFHLYHU VKDOO EH SURJUDPPDEOH WR HOHFWURQLFDOO\ ORFN RXW XQQHHGHG FKDQQHOV The receiver shall be capable of seeking channels. The device shall be able to be locked on a single channel. The device shall have an adjustable squelch. The device shall have an audio frequency UHVSRQVH RI +] WR .
LR-400/500 Block Diagram Up LCD Display Down Power Supply CPU Module 115/230VAC 50/60 Hz Seek Universal Power Supply (not included) Alkaline Power charge indicator Red LED NiMH (2) AA Batteries ALkaline or NiMH POWER On Off ANTENNA RF de-modulation de-emphasis Companding Q-Technology VOLUME Tip 3.
LR-400-863 Quick Reference Articulating Flexible Antenna PP 2XWSXW -DFN &RQQHFW D OLVWHQ HDUSLHFH KHUH /(' :KHQ OLW LQGLFDWHV XQLW KDV SRZHU 2Q 2II DQG 9ROXPH &RQWURO 'LDO /RRN /LVWHQ 'LVSOD\ 6KRZV receive level, channel, battery status, and lock status. 3RZHU &KDUJLQJ 3RUW 6((. %XWWRQ $OORZV WKH user to change channels or lock on a channel. Front Door Lock %DWWHU\ 6HOHFW 6ZLWFK &KRRVH the type of batteries being used.
LR-500-863 Quick Reference PP 2XWSXW -DFN &RQQHFW D OLVWHQ HDUSLHFH KHUH /(' :KHQ OLW LQGLFDWHV XQLW KDV SRZHU 2Q 2II DQG 9ROXPH &RQWURO 'LDO Articulating Flexible Antenna /RRN /LVWHQ 'LVSOD\ Shows receive level, channel, programming, battery status, and lock status. 3RZHU &KDUJLQJ 3RUt 6((. %XWWRQ $OORZV WKH user to change channels or lock on a channel. Front Door Lock %DWWHU\ 6HOHFW 6ZLWFK &KRRVH the type of batteries being used.
LR-400/500 Setup Instructions 1 Remove the product 5HPRYH RXWHU SDFNDJLQJ DQG SODVWLF FRYHU ,QVSHFW IRU SK\VLFDO GDPDJH ,I GDPDJH LV DSSDUHQW please contact the dealer from which the product was purchased or Listen Technologies Corpora WLRQ WHFKQLFDO VXSSRUW IRU DVVLVWDQFH UHIHU WR SDJH IRU FRQWDFW LQIRUPDWLRQ 2 Open the front access door ,I ORFNHG XVH D SRFNHWNQLIH RU VPDOO VFUHZGULYHU WR XQORFN WKH GRRU ORFNV RQ ERWK VLGHV RI the unit.
LR-400/500 Setup Instructions 4 Place Batteries in Unit Place two AA batteries in the compartment, making note of the battery polarity shown in the battery FRPSDUWPHQW DQG DJDLQ YHULI\LQJ WKDW WKH %$77(5< 6(/(&7 VZLWFK LV LQ WKH FRUUHFW SRVLWLRQ IRU WKH EDWWHULHV \RX DUH XVLQJ $ONDOLQH VKRXOG EH VHOHFWHG IRU DOO EDWWHU\ W\SHV RWKHU WKDQ 1L0+ NOTE: Listen provides industrial strength AA alkaline batteries (part number LA-361) and high performance AA Nickel Metal Hydride batteries (part number LA-362)
LR-400/500 Setup Instructions 6 Turn the Unit On LR-400/500 LT-800 Receivers are turned on by rotating the volume dial counterclockwise. The red LED on top of the unit will LOOXPLQDWH DQG WKH /&' GLVSOD\ VKRXOG LOOXPLQDWH ,I WKH\ GR QRW PDNH VXUH \RX KDYH LQVWDOOHG WKH EDWWHU ies correctly and that you are using fully charged batteries.
LR-400/500 Operating Instructions 1 Turn Unit On 1A Volume knob Rotate the volume knob counterclockwise with an earphone or headset connected to the unit. WARNING: Excessive volume may result in hearing damage. 2 Antenna Placement 2A Antenna Position Raise the antenna to the upright position. When the antenna if fully extended, it will click into position. NOTE: Be aware that the transmission range could decrease if the antenna is not in an upright position.
LR-400/500 Operating Instructions 3A Select the channel using SEEK $QRWKHU ZD\ WR ÀQG D FKDQQHO RQ WKH /5 LV WR XVH WKH 6((. EXWWRQ When you do this, the Listen receiver looks for the next active channel. 6RPHWLPHV WKH XQLW ZLOO PLVWDNH LQWHUIHUHQFH IRU D UHDO EURDGFDVW VLJQDO ,I \RX JHW LQWHUIHUHQFH SUHVV WKH 6((. EXWWRQ DJDLQ 7KH XQLW PD\ VWRS RQ D channel that is close to the actual broadcast channel, in which case the FKDQQHO ZLOO VRXQG QRLV\ RU GLVWRUWHG 6LPSO\ SUHVV 6((.
LR-400/500 Operating Instructions Locking the Receiver on One Channel 7KH XQLW FDQ EH HOHFWURQLFDOO\ ORFNHG RQ RQH FKDQQHO VR WKDW LW ZLOO QRW FKDQJH FKDQQHOV HYHQ LI WKH ´6((.µ EXWWRQ LV SUHVVHG ,W LV UHFRPPHQGHG WR ORFN WKH UHFHLYHU RQ D FKDQQHO WKDW LV EHLQJ XVHG LQ D VLQJOH FKDQQHO V\VWHP RU ZKHQ PXO tiple systems are in the same area. 1 To lock on a channel 1A Press and hold the SEEK button for 5 seconds 3UHVV DQG KROG WKH 6((.
LR-400/500 Operating Instructions Squelch Programming Entering Squelch Program Mode 1 2 3 Turn unit off 3UHVV DQG KROG WKH 6((. EXWWRQ ZKLOH KROGLQJ 6((. EXWWRQ GRZQ WXUQ WKH 21 2)) 92/80( GLDO WR WXUQ the unit on. 5HOHDVH WKH 6((. EXWWRQ ZKHQ WKH /LVWHQ QDPH GLVDSSHDUV DSSUR[LPDWHO\ VHFRQGV DQG D WZR GLJLW display is seen. Adjusting the Squelch level 1 8VH WKH &KDQQHO 83 DQG '2:1 EXWWRQV WR UDLVH RU ORZHU WKH VTXHOFK VHQVLWLYLW\ VHWWLQJV UHIHU WR WKH FKDUW RQ page 49 for settings.
LR-400/500 Operating Instructions Squelch The purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone.
LR-400/500 Operating Instructions DX/Local '; LV WKH QRUPDO RSHUDWLRQDO PRGH /RFDO PRGH FDQ HIIHFWLYHO\ OLPLW DQ\ LQWHU PRGXODWLRQ DQG RU interference in a busy RF environment. This is done by limiting the amount of RF gain in the receiver. When local mode is selected, the range of the receiver is compromised.
LR-500 Programming Instructions (LR-500 only) Programming Instructions 7KH /5 FDQ EH SURJUDPPHG WR UHFHLYH RQ D OLPLWHG QXPEHU RI FKDQQHOV :KHQ DQ DSSOLFDWLRQ UHTXLUHV WKH XVH RI PRUH WKDQ RQH FKDQQHO L H D FODVVURRP RU ODQJXDJH LQWHUSUHWDWLRQ WKH UHFHLYHU FDQ EH SURJUDPPHG WR YLHZ RQO\ WKH QHFHVVDU\ FKDQQHOV Entering Program Mode 1 To enter program mode 1A While the unit is ON, press and hold the channel down and up buttons simultaneously for 3 seconds.
Accessories for LR-400/500 Accessories /$ Ear Speaker Stereo Headphones /$ Assistive Listening 1RWLÀFDWLRQ 6LJQDJH .
Notes LR-400/500 53
LR-400/500 LT-800 Notes 54
LR-400/500
Supplementary Information Table of Contents Frequency Chart %DWWHU\ &KDUJLQJ ,QIRUPDWLRQ Troubleshooting Frequently Asked Questions &RPSOLDQFH :DUUDQW\ DQG &RQWDFW ,QIRUPDWLRQ Notes 61 63 65 68 Supplementary 59
Frequency Chart Frequencies Supplementary 61
Battery Charging Information 7KH /7 DQG /5 UHFHLYHUV DUH XQLTXH EHFDXVH WKH\ KDYH 6PDUW&KDUJH FKDUJHUV EXLOW LQ :KHQ DQ\ RI WKHVH XQLWV DUH SODFHG into a Listen charging case, NiMH batteries will be charged. 6PDUW&KDUJH XVHV D SXOVH FKDUJLQJ ZKLFK JUHDWO\ H[WHQGV WKH OLIH RI 1LFNHO 0HWDO +\GULGH 1L0+ EDWWHULHV 7KH HQWLUH FKDUJLQJ SURFHVV takes about 13 hours. Listen recommends that you allow the charger to complete its full cycle every time for maximum battery life.
Troubleshooting Troubleshooting The unit has no power. 0DNH VXUH WKH XQLW KDV IXOO\ FKDUJHG EDWWHULHV 3UHVV WKH 32:(5 EXWWRQ ,I WKLV GRHV QRW ZRUN WU\ D different set of batteries. Make sure the batteries are installed correctly. There is no audio. 0DNH VXUH WKH 087( 7$/. VZLWFK LV LQ WKH 7$/.
Troubleshooting Troubleshooting My batteries are not charging 0DNH VXUH \RX DUH XVLQJ 1L0+ EDWWHULHV DQG WKDW WKH %$77(5< 6(/(&7 VZLWFK LQVLGH WKH EDWWHU\ FRPSDUWPHQW LV VHW WR WKH 1L0+ SRVLWLRQ 0DNH VXUH WKH EDWWHULHV DUH LQVWDOOHG FRUUHFWO\ 0DNH VXUH you are using a Listen charging case. Make sure the charging case is connected to power and the unit is securely pushed into its slot in the case.
Frequently Asked Questions Frequently Asked Questions Q 'R , QHHG D WUDQVPLWWHU IRU HDFK DXGLR VRXUFH" Yes. To transmit two different frequencies, there must be two separate transmitters.
Frequently Asked Questions Frequently Asked Questions Q &DQ WKH UHFHLYHU EH ´ORFNHGµ RQ D FKDQQHO LI QHHGHG" Yes. All Listen receivers can be locked on a single channel. A Q :KDW LV WKH EDWWHU\ OLIH RI D UHFHLYHU" 20 hours using alkaline batteries. 10 hours using NiMH batteries.
Compliance, Warranty and Contact Information Compliance Information 7KH IROORZLQJ FRPSOLDQFH LQIRUPDWLRQ DSSOLHV WR WKH /7 /7 /5 DQG /5 7KHVH GHYLFHV FRPSO\ ZLWK (76, (1 These devices are CE compliant. These devices are RoHS compliant.
Supplementary LT-800 Notes 68
Listen Technologies Corporation 14912 Heritagecrest Way %OXIIGDOH 8WDK 8 6 $ +1.801.233.8992 +1.800.330.0891 North America +1.801.233.8995 Fax www.listentech.com info@listentech.com Listen Technologies GmbH Jasminstr. 16 905 22 Oberasbach, Germany +49 911 955159 0 (0($, +49 911 955159 40 Fax www.listentech.de info@listentech.
