Listen Technologies 863.400 User Manual

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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. Should you experience any problems whatsoever with your Listen products, we are ready to help you in any way we can with prompt,

HIÀFLHQW FXVWRPHU FDUH %HFDXVH DW /LVWHQ LW·V DOO DERXW \RX $QG VKRXOG \RX have any comments on how we might improve our products or our

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+1.801.233.8992 +1.800.330.0891 North America +1.801.233.8995 Fax

support@listentech.com

www.listentech.com

Listen Technologies GmbH

Jasminstr. 16

905 22 Oberasbach, Germany

+49 911 955159 0 Tel

+49 911 955159 40 Fax

www.listentech.de

info@listentech.de

Thank you and enjoy your listening experience!

%HVW UHJDUGV

Russell Gentner and the Listen Team

Lifetime Warranty – the best in the business!

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Overall client satisfaction of working with Listen was rated 4.8 out of 5.

The Word Around Listen

“Please continue with your excellent attitude toward customer satisfaction. You guys are great!”

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“You stand behind your product wonderfully.”

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Portable FM Table of Contents

Design Guide

 

 

 

 

 

 

 

 

 

 

FM Technology Overview

 

 

 

 

 

 

 

5

System Overview

 

 

 

 

 

 

 

 

 

6

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Notes

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

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6SHFLÀFDWLRQV

 

 

 

 

 

 

 

 

 

 

%ORFN 'LDJUDP

 

 

 

 

 

 

 

 

 

Quick Reference

 

 

 

 

 

 

 

 

 

19

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Accessories

 

 

 

 

 

 

 

 

 

28

Notes

 

 

 

 

 

 

 

 

 

29

 

 

 

 

 

 

 

 

 

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Quick Reference

 

 

 

 

 

 

 

 

 

40

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Accessories

 

 

 

 

 

 

 

 

 

52

Notes

 

 

 

 

 

 

 

 

 

53

 

 

 

 

 

 

 

 

 

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Frequency Chart

 

 

 

 

 

 

 

 

 

61

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Troubleshooting

 

 

 

 

 

 

 

 

 

63

Frequently Asked Questions

 

 

 

 

 

 

 

65

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Notes

 

 

 

 

 

 

 

 

 

68

Guide Design

700-LT

400/500-LR

Supplementary

Portable FM Design Guide Table of Contents

FM Technology Overview

 

 

 

 

 

5

System Overview

 

 

 

 

 

6

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Notes

 

 

 

 

 

10

Guide Design

3

Frequency Modulation (FM) Technology Overview

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This same technology is used by local FM radio stations to broadcast voice and music. FM signals can travel

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VXFK DV 5DGLR )UHTXHQF\ 5) RXWSXW SRZHU WKH W\SH DQG SODFHPHQW RI WKH DQWHQQD DQG WKH EURDGFDVWHG frequency. This section of the manual will help you design a system that will get the best range with the least amount of interference.

Microphone

Guide Design

 

 

 

 

Receiver

 

 

FM Transmitter

 

 

 

 

 

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• Multipath

Multipath interference is a form of RF interference that occurs when radio signals have more than one path between the receiver and the transmitter causing the two RF signals to add out of phase. This could occur in areas

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• Antenna Positioning

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5

Design Guide

System Overview

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Portable Programmable

 

Portable Display FM

Portable Display FM

 

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Input Source

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Thus, a person can use a line input source and mic source.

3.5mm Phone Wiring

Unbalanced

+ Tip

Mic input

 

 

 

+ Ring

 

 

 

 

 

 

 

 

Line input

 

 

 

- Sleeve

 

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

System Overview

Transmitter

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Portable Display FM

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Receivers

Listen offers two different portable receivers.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Portable Display FM

 

 

 

Portable Programmable

 

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Guide Design

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.

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EXAMPLE: 2 channel system use channels 01 & 11

3 channel system use channels 01, 06 & 11

Range

The range of a portable transmission will vary from one application to another. There are many different

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Range varies depending on environment.

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Move transmitter and receivers away from metal objects.

Orient both transmitting and receiving antennas vertically.

8

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

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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 radio noise in your earphone with no RF signal present. “Tightening” the squelch will turn the receiver off if it is chattering because of

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Transmitter power level

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The lower the power setting, the less range the transmitter will broadcast. Decreasing the broadcast range will force the receivers to remain closer to the transmitter. To maintain an RF signal, the higher power settings will increase range between transmitter and receiver thus introducing a higher probability of multipath.

Multiple Portable Systems

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Squelch

Much like a multipath situation, “tightening” the squelch on the receiver will mute the audio output when the signal is too weak to be received. Tightening the squelch will help with force the receiver to squelch

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Transmitter power level

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Spacing of channels

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DX/Local

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Guide Design

9

Notes

Design Guide

10

Notes

Guide Design

11