Listen Technologies 863 MHz Design Manual
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Listen Technologies 863 MHz, 24 LT-800LT-700 Using the MUTE / TALK switch Slide the switch to the mute position and the microphone audio is muted. When the PLFURSKRQHDXGLRLVPXWHGWKH/('RQWRSRIWKHXQLWÁDVKHVUDSLGO\6OLGHWKHVZLWFKEDFNWRWKHWDON SRVLWLRQDQGWKHPLFURSKRQHDXGLRZLOOUHWXUQWRWKHWUDQVPLVVLRQ,I\RXDUHXVLQJWKHOLQHOHYHOLQSXWLWZLOO QRWEHDIIHFWHGE\WKHPXWHWDONVZLWFK LT-700 Operating Instructions To lock on a channel NOTE: On the LT-700, when the channel is locked, a lock icon will appear u
Listen Technologies 863 MHz, 15 LT-800LT-700 LT-700 Package Contents /7 • Quick Reference Card • Warranty Card • FM Manual Card /LVWHQ&RQÀJXUDWLRQV /7 LT-700 User’s Manual Table of Contents 6SHFLÀFDWLRQV %ORFN'LDJUDP Quick Reference 19 6HWXS,QVWUXFWLRQV 2SHUDWLQJ,QVWUXFWLRQV �
Listen Technologies 863 MHz, LR-400/500 To lock on a channel NOTE: On the LR-400/500, when the channel is locked, a lock icon will appear underneath “Listen” on the display. Also if the unit is locked, the red LED on top of the receiver will ÁDVKZKHQWKH6((.EXWWRQLVSUHVVHG. Press and hold the SEEK button for 5 seconds 3UHVVDQGKROGWKH6((.EXWWRQIRUVHFRQGVWRORFNDUHFHLYHURQWRWKHFXUUHQWO\WXQHG channel. Press and hold the button again to unlock. When locked the LED on top of WKHXQLWZLOOÁDVKZKHQ\RXSUHVVWKH6((.EXWWRQ LR-
Listen Technologies 863 MHz, 39 LR-400/500 LR-400/500 Block Diagram POWER ANTENNA 3.5 mm Connector VOLUME On Off Companding Q-Technology de-emphasis RF de-modulation LCD Display Universal Power Supply (not included) Power Supply CPU Module Up Power charge indicator Red LED Down Seek Tip Ring Sleeve 115/230VAC 50/60 Hz (2) AA Batteries ALkaline or NiMH NiMH Alkaline
Listen Technologies 863 MHz, 46 LT-800LR-400/500 LR-400/500 Operating Instructions Adjust the volume control Use the control dial on the top of the unit to adjust the volume to a comfortable level. $QRWKHUZD\WRÀQGDFKDQQHORQWKH/5LVWRXVHWKH6((.EXWWRQ When you do this, the Listen receiver looks for the next active channel. 6RPHWLPHVWKHXQLWZLOOPLVWDNHLQWHUIHUHQFHIRUDUHDOEURDGFDVWVLJQDO,I\RX JHWLQWHUIHUHQFHSUHVVWKH6((.EXWWRQDJDLQ7KHXQLWPD\VWRSRQD channel that is close to the actual broadcast channel, in which case the
Listen Technologies 863 MHz, 42 LT-800LR-400/500 LR-400/500 Setup Instructions Remove the product 5HPRYHRXWHUSDFNDJLQJDQGSODVWLFFRYHU,QVSHFWIRUSK\VLFDOGDPDJH,IGDPDJHLVDSSDUHQW please contact the dealer from which the product was purchased or Listen Technologies Corpora WLRQWHFKQLFDOVXSSRUWIRUDVVLVWDQFHUHIHUWRSDJHIRUFRQWDFWLQIRUPDWLRQ Open the front access door ,IORFNHGXVHDSRFNHWNQLIHRUVPDOOVFUHZGULYHUWRXQORFNWKHGRRUORFNVRQERWKVLGHVRI the unit. To unlock the door, rotate the lock ¼ turn counterclockwise. Grip the two tabs with \RXUWKXP
Listen Technologies 863 MHz, 9 Design Guide Key concepts in designing a portable FM system 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 FDQKHOSLIPXOWLSDWKWDNHVSODFH Eliminating Multipath 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. Without squelch you would hear
66 LT-800Supplementary Frequently Asked Questions Frequently Asked Questions Q &DQWKHUHFHLYHUEH´ORFNHGµRQDFKDQQHOLIQHHGHG" A Yes. All Listen receivers can be locked on a single channel. Q :KDWLVWKHEDWWHU\OLIHRIDUHFHLYHU" A 20 hours using alkaline batteries. 10 hours using NiMH batteries.
Listen Technologies 863 MHz, 26 LT-800LT-700 2QFHLQWKHSURJUDPPRGHDIXQFWLRQPHQXLVGLVSOD\HG)XQFWLRQ)LVGLVSOD\HGDVGHIDXOW3UHVVLQJWKH channel up or down buttons will scroll through the functions. Pressing the power button will enter that function. )&KDQQHO/RFNRXW1RFKDQQHOVDUHORFNHGRXWDVGHIDXOW3UHVVLQJWKHXSDQGGRZQEXWWRQVZLOOVFUROOWKURXJK FKDQQHOV3UHVVLQJWKHSRZHUEXWWRQZLOOWRJJOHEHWZHHQORFNORFNRXWIRUWKDWFKDQQHO
Listen Technologies 863 MHz, 63 Supplementary Troubleshooting Troubleshooting The unit has no power. 0DNHVXUHWKHXQLWKDVIXOO\FKDUJHGEDWWHULHV3UHVVWKH32:(5EXWWRQ,IWKLVGRHVQRWZRUNWU\D different set of batteries. Make sure the batteries are installed correctly. There is no audio. 0DNHVXUHWKH087(7$/.VZLWFKLVLQWKH7$/.SRVLWLRQ0DNHVXUH\RXKDYHWKHPLFURSKRQHSOXJJHG DOOWKHZD\LQWRWKHLQSXWMDFN0DNHVXUH\RXDUHXVLQJD/LVWHQDSSURYHGPLFURSKRQHVHHOLVWRQ SDJH,I\RXDUHXVLQJWKHOLQHLQSXWPDNH
Listen Technologies 863 MHz, 28 LT-800LT-700 Accessories for LT-700 Accessories /$8QLW3RUWDEOH&KDUJLQJ&DUU\LQJ&DVH /$8QLW3RUWDEOH&DUU\LQJ&DVH /$8QLW3RUWDEOH&KDUJLQJ&DUU\LQJ&DVH /$8QLW3RUWDEOH&DUU\LQJ&DVH /$&RQÀJXUDEOH&DUU\LQJ&DVH /$8QLW3RUWDEOH&KDUJLQJ&DUU\LQJ&DVH /$8QLW3RUWDEOH&DUU\LQJ&DVH /$8QLW3RUWDEOH&KDUJLQJ&DUU\LQJ&DVHZ5HPR
Listen Technologies 863 MHz, LR-400/500 /56SHFLÀFDWLRQV $UFKLWHFWXUDO6SHFLÀFDWLRQ 7KH/5)0UHFHLYHUVKDOOEHFDSDEOHRIUHFHLYLQJRQZLGHEDQGFKDQQHOVZLWKD615RI G%RUJUHDWHU7KHGHYLFHVKDOOEHDEOHWREHORFNHGRQDVLQJOHFKDQQHO7KHUHFHLYHUVKDOOEH capble of seeking channels. The device shall have an adjustable squelch. The device shall have an DXGLRIUHTXHQF\U
8 Design Guide The range of a portable transmission will vary from one application to another. There are many different REVWUXFWLRQVWKDWFRXOGPLQLPL]HWKHUDQJH,QPRVWDSSOLFDWLRQVWKHUDQJHZLOOEHDSSUR[LPDWHO\DVVKRZQ EHORZ3 3RZHU/HYHOUHIHUWRSDJHIRUSURJUDPPLQJSRZHUOHYHOVRIWKH/7�
Listen Technologies 863 MHz, LT-800LT-700 /76SHFLÀFDWLRQV $UFKLWHFWXUDO6SHFLÀFDWLRQ 7KH/7SRUWDEOH)07UDQVPLWWHUVKDOOEHFDSDEOHRIEURDGFDVWLQJRQFKDQQHOV&KDQQHOWXQLQJVKDOOEHFDSDEOHRIEHLQJ ORFNHG7KHWUDQVPLWWHUVKDOOKDYHD615RIGERUJUHDWHU7KHRXWSXWSRZHUVKDOOEHDGMXVWDEOHWRTXDUWHUKDOIRUIXOO7KHGHYLFH VKDOOKDYHDQDXGLRIUHTXHQF\UHVSRQVHRI�
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