Bogen DFT120 Service Manual

Digital Feedback Terminator DFT120 Model

Installation and Use Manual

Notice: Every effort was made to ensure that the information in this guide was complete and accurate at the time of printing. However, information is subject to change.

FCC Statement (Part 15) - Radio Frequency Interference

The Digital Feedback Terminator generates and uses radio frequency energy and if not installed and used in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception.Testing is being conducted for compliance with the limits for a Class B device in accordance with the specifications in Part 15 of the FCC Rules.This testing is designed to provide reasonable protection against such interference. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception,which can be determined by turning the Digital Feedback Terminator unit off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

- Reorient the radio or TV receiving antenna.

- Relocate the Digital Feedback Terminator unit with respect to the radio or TV receiver or vice versa.

- Plug the Digital Feedback Terminator unit into a different outlet so that it and the radio or TV receiver are on different branch circuits.

If necessary,the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may find the following booklet, "How To Identify and Resolve Radio-TV Interference Problems," helpful.This booklet was prepared by the Federal Communications Commission (FCC) and is available from the U.S. Government Printing Office,Washington, DC 20402. Stock order No. 004-000-00345-4.

Important Safety Information

Always follow these basic safety precautions when installing and using the system:

1. Read and understand all instructions.

2. Follow all warnings and instructions marked on the product.

3. DO NOT block or cover the ventilation slots and openings. They prevent the product from overheating. DO NOT place the product in a separate enclosure or cabinet, unless proper ventilation is provided.

4. Never spill liquid on the product or drop objects into the ventilation slots and openings. Doing so may result in serious damage to the components.

5. Repair or service must be performed by a factory authorized repair facility.

6. The product is provided with a UL-CSA approved, 3-wire ground type plug.This is a safety feature.DO NOT defeat the safety purpose of the grounding type plug. DO NOT staple or otherwise attach the AC power supply cord to building surfaces.

7. DO NOT use the product near water or in a wet or damp place (such as a wet basement).

8. DO NOT use extension cords.The product must be installed within 6 feet of a grounded outlet receptacle.

9. DO NOT install telephone wiring during a lightning storm.

10. DO NOT install telephone jacks in a wet location unless the jack is specifically designed for wet locations.

11. Never touch uninsulated wires or terminals, unless the line has been disconnected at the paging or controller interface.

12. Use caution when installing or modifying paging or control lines.

Contents

Overview ........................................................................................................................................................4

Features and Capabilities ................................................................................................................................................4

Specifications ......................................................................................................................................................................4

Physical........................................................................................................................................................................4

Electrical ....................................................................................................................................................................4

Environmental............................................................................................................................................................4

Interconnect ..............................................................................................................................................................4

Panel Descriptions ........................................................................................................................................5

Installation ......................................................................................................................................................6

Package Contents..............................................................................................................................................................6

Installation Steps................................................................................................................................................................6

Mounting the Unit ............................................................................................................................................................6

Operation ......................................................................................................................................................7-8

Page Operation..................................................................................................................................................................7

Recording a Page......................................................................................................................................................7

Playing Back a Page ..................................................................................................................................................8

Override Operation ........................................................................................................................................................8

Connections and Switches............................................................................................................................9-14

Power..........................................................................................................................................................................9

Override Input..........................................................................................................................................................9

Override Control Switch ......................................................................................................................................9

Page In Input..............................................................................................................................................................9

Page In Control Switch ..........................................................................................................................................9

Audio Out Volume Control ..................................................................................................................................10

Audio Out Impedance Selector............................................................................................................................10

Audio Out..................................................................................................................................................................10

General Purpose I/O Connector ........................................................................................................................10

Setting Setup Switches ....................................................................................................................................................10

Configuration Switch Position ..............................................................................................................................10

Record Activation ....................................................................................................................................................10

DTMF Stripping ........................................................................................................................................................11

DTMF Control ..........................................................................................................................................................11

DTMF Allotment ......................................................................................................................................................11

Message Abort ..........................................................................................................................................................11

Play Mode ..................................................................................................................................................................11

Pre-Page Tone ............................................................................................................................................................11

Number of Plays ......................................................................................................................................................12

Play Delay ..................................................................................................................................................................12

External I/O Connections and Control ......................................................................................................................13

Abort Control Input................................................................................................................................................13

Override Control Input..........................................................................................................................................13

Stop Control Input ..................................................................................................................................................13

Play Control Input....................................................................................................................................................13

Page In Control Input..............................................................................................................................................13

Terminal Block, Output Signals ......................................................................................................................................14

Busy Contact ............................................................................................................................................................14

Play Contact ..............................................................................................................................................................14

Rec Contact ..............................................................................................................................................................14

Example System Setup and Connecting to the Paging Systems ............................................................................15

Overview

Features and Capabilities

The Digital Feedback Terminator has 4 minutes of available audio memory and can record up to 16 paging messages. A single page can have a maximum length of 1 minute. The unit can record new pages while playing back previously recorded pages.

The DFT120 eliminates feedback over the paging system by opening the loop between the input microphone and the speakers.This not only eliminates the potential for acoustic feedback, but also gives the user flexibility in the manner in which pages are broadcast.

Multiple Record and Playback options are supported, as well as Pre-Page Tones, Message Repeat, and Adjustable Delay Between Message Repeats functions.Abort and Stop functions are also available.

The DFT120 includes a transformer-isolated 600-ohm page input and priority override input,as well as a transformerisolated switchable 8-ohm or 600-ohm audio output.

Specifications

Physical

Maximum dimension: 10" W x 1

/2" H x 61/2" D

Weight: 4.5 lb. (2 kg)

Electrical

• Frequency Response: 6.8 kHz, and 60 dB of dynamic range

• Page Audio Input: 600 ohms, transformer-isolated, with -20 dBm to +4 dBm (nominal 0 dBm) input level

• Priority Audio Input: 600 ohms, transformer-isolated, with -20 dBm to +4 dBm (nominal 0 dBm) input level

• Selectable Audio Output: Line Output (600 ohms, transformer-isolated, +4 dBm max. continuously adjustable) or Power Output (8 ohms, transformer isolated, limited to approximately 0.125 Watts into 8 ohms, adjustable)

• Relay contacts:All control relay contacts available are rated at 1 Amp, 24V DC noninductive loads

• Power requirement: 12V DC, 1 Amp from wall-mounted power pack supplied

• Memory Capacity: 240 seconds, 16 messages max., up to 1 minute max. per message

Environmental

Capable of operating in ambient temperatures from 0 to +40°C (+32 to 104°F) and relative humidity from 0% to 85% (noncondensing), at altitudes up to 10,000 feet above sea level.

Interconnect

All external interface connectors are RJ11 type and/or two piece screw terminal pluggable Euro-connector type.

Panel Descriptions

1. Power - Input jack for power connection.

2. Override Input - RJ11 jack for both loop start and dry audio input sources.

3. Override Control Switch - Selects either dry loop (DL) or loop start (LS).

4. Page In Input - RJ11 jack for both dry audio and loop start applications.

5. Page In Control Switch - Selects either dry loop (DL) or loop start (LS).

6. Audio Out Volume Control - Output volume control.

7. Audio Out Impedance Selector - Selects either 8-ohm or 600-ohm.

8. Audio Out - RJ11 jack for Audio Out w/Status Signal Connector.

9. Setup Switches - Dip switch settings control unit feature operation.

10. I/O Connections - Various control inputs and status outputs are available at this connector.All I/O connections are electrically isolated from the unit’s chassis.

LED Indicators

Power - Green, power is applied to unit

Override Active - Yellow, indicates override input is active

Page Active - Yellow, indicates page input is active

Audio Trigger - Green, audio is detected

Busy - Yellow, unit is active

Play - Green, unit is actively playing a page

Record - Red, unit is actively recording a message

Bottom Panel

+ 11 hidden pages