TX150-300 Manual.pdf

TX150/300 FM Broadcast Transmitter

Technical manual

No part of this manual may be re-produced in any form without prior written permission from BW Broadcast.

The information and specifications contained in this document is subject to change at any time without notice.

www.bwbroadcast.com

WARNING

This transmitter should never be operated without a suitable antenna or test dum-

my load! Failure to observe this requirement may result in damage to the transmit-

ter that is not covered by the warranty.

IMPORTANT

This transmitter has been shipped with the internal stereo generator enabled. The

internal jumper J1 (MPX loop-through) is set to ON.

If you intend to connect a MPX signal to the MPX input BNC connector you will

need to move J1 (MPX loop-through) to the OFF position.

Examples of conigurations requiring setting J1 to OFF include:

●

Routing the internal MPX signal through an external RDS encoder.

Connecting an external audio processor or stereo generator to the

transmitter.

Connecting a re-broadcast or STL receiver to the transmitter.

●

Consult the manual for further information on the transmitter’s jumpers and con-

nections.

CONTENTS

Introduction

1.1

TX FM Transmitter

1.2

Safety

Quick setups

1.4

Front And Rear Panels

1.5

Control And Monitor LCD

Installation And Setup

2.1

Frequency Setup

2.2

R.F. Power Setup

Alarms

2.4

RS22 Control & Monitoring

2.41 Windows remote control application

2.42 Terminal control of the transmitter

2.5

Modes Of Operation

2.51 A guide to the jumpers

2.52 Multiplex / Broadband Input

2.5 Stereo With Limiters

2.54 Stereo With Limiters Disabled

2.55 Mono From Two Channels

2.56 Mono From One Channel

2.6

Other Setup Considerations

Technical data

Specifications

Circuit Description

.21 Combo board

.22 LCD control board

.2 Power amplifier board

Block Diagram

Internal Wiring / Case Overview

Schematics

.51 Combo section

.511 Limiter section

.512 Coder section

.51 Exciter section

.52 LCD control section

.5 Power amplifier section

Parts List

.61 Combo board parts list

.62 LCD control board parts list

.6 Power amplifier board parts list

BW Broadcast technical manual

Page

Introduction

1.1 TX 150/300 FM TRANSMITTER

The BW Broadcast TX 150/00 is a high specification FM broadcast transmitter. Its broadband “no-tune” design

allows 87.5-108 MHz operation from internal direct reading rotary switches or the front panel LCD frequency con-

trol system if enabled. Digital PWM techniques provide an easily adjustable and accurate automatic level control-

led R.F. output of the MOS-FET power amplifier stage.

RF, audio and other parameters are shown on the LCD graphics display. This display offers a very easy method

of transmitter parameter monitoring and a new level of ease for setup and installation, with metering accuracy

normally only found on expensive test equipment. Local and remote personal computer control and metering are

achievable via RS22 interface and there's an alarm I/O as well.

The FM modulator section employs a dual speed “virtual VFO” system for extremely low audio distortion and

excellent stereo performance.

A built in high specification stereo encoder provides crystal clear stereo sound and combined with the internal lim-

iter a fully compliant “plug and play” all in one low power broadcast transmitter.

For future compatibility all settings are switchable with on board jumpers. The stereo and/or limiter settings can be

switched in and out to suit the requirements of any external broadcast equipment you may have now and in the

future.

The lightweight universal mains input design ensures a high reliability efficient design compatabile with any mains

system in the world.

BW Broadcast technical manual

Page 4

Introduction

1.2 SAFETY

MAINS VOLTAGE

This equipment operates from an AC power source of between 90 and 265 volts. There are hazardous

voltages present internally. PLEASE OBSERVE CAUTION WITH THE COVER REMOVED.

SWITCHED MODE POWER SUPPLY HAZARD

Please note that the power supply units in this equipment is of the switched mode variety and have lethal

voltages present internally. The switched mode supplies are universal input fully approved type. They are

non serviceable modules and should be fully replaced should they fail.

FUSES

Only use fuses with the specified voltage and current ratings as stated on the back panel. Failure to do so

may increase the risk of equipment failure, shock and fire hazard.

R.F.

The N type R.F. power output socket contains R.F. voltages which may burn or present a shock. Please

make sure that the equipment is connected to an adequately rated load or antenna system while in opera-

tion.

TOXIC HAZARD

This equipment includes R.F. components that may contain Beryllium oxide which is a highly toxic sub-

stance that could be hazardous to health if inhaled or ingested. Care should be taken when replacing or

discarding such devices. Seek expert advice from the manufacturer should you physically damage a device

that contains Berillyium Oxide. The main R.F. output power transistor contains Beryllium oxide.

OTHER SAFETY CONSIDERATIONS

Do not operate this equipment in the presence of flammable gases, fumes or liquids

Do not expose this equipment to rain or water.

CE CONFORMANCE

This device complies with the requirements of the 1995/5/EC Radio and Telecommuni-

cations Terminal Equipment (R&TTE). The equipment will meet or exceed the following

standards: EN 60215:1996 (Safety Requirements for Radio Transmitting Equipment),

EN 01 489-11 (ERM/EMC for Radio Equipment, Part 11 Specific Conditions for FM

Transmitters), EN 02 018-2 ERM (Transmitting Equipment for FM Radio Broadcasting

service)

The operating frequencies of this transmitter may not be harmonised in the intended

countries of use. The user must obtain a license before using the product in the intend-

ed country of use. Ensure respective country licensing requirements are complied with.

Limitations of use can apply in respect of operating frequency, transmitter power and/or

channel spacing.

WEEE COMPLIANCE

BW Broadcast Ltd is registered with Northern Compliance PCS number WEE/P48PR/

SCH and has been issued with WEE/FA0268RX as its unique producer ID by the appro-

priate environment agency. BW Broadcast Ltd full comply with it explicit responsibilities,

subject to WEEE Collections Policy outlined in their General Terms and conditions of

Sale, when it sells Electrical and Electronic Equipment (EEE) to B2B customers in the

UK and EU.

This appliance has been designed and manufactured with high quality materials and components that can

be recycled and reused. Electronic appliances are liable to contain parts that are necessary in order for the

system to work properly but which can become a health and environmental hazard if they are not handled

and disposed of in the proper way. Consequently, please do not throw your inoperative appliance with the

household waste. Having purchased this appliance it is your responsibility to dispose of this equipment

appropriately.

BW Broadcast technical manual

Page 5

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