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TX150/300 FM Broadcast
Transmitter
Technical Manual
v2.1
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.
Copyright 2012 BW Broadcast
www.bwbroadcast.com
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Table of Contents
Related Manuals for BW Broadcast TX150/300
Summary of Contents for BW Broadcast TX150/300
- Page 1 Technical Manual v2.1 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. Copyright 2012 BW Broadcast...
- Page 2 WARNING This transmitter should never be operated without a suitable antenna or test dummy load! Failure to observe this requirement may result in damage to the transmitter that is not covered by the warranty. IMPORTANT This transmitter has been shipped with the internal stereo generator enabled. The internal jumper J5 (MPX loop-through) is set to ON.
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Page 3: Table Of Contents
3.513 Exciter section 3.514 Digital Input Section 3.52 LCD control section 3.53 Power amplifier section Parts List 3.61 Combo board parts list 3.62 LCD control board parts list 3.63 Power amplifier board parts list Page 3 BW Broadcast technical manual... - Page 4 Introduction TX150+/300+ FM TRANSMITTER The BW Broadcast TX150+/300+ 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 control system if enabled. Digital PWM techniques provide an easily adjustable and accurate automatic level controlled R.F.
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Page 5: Introduction
If the product shows any defects within the specified warranty period that are not due to normal wear and tear and/or improper handling by the user, BW Broadcast shall, at its sole discretion, either repair or replace the product. If the unit has a manufacturers fault within twenty eight (28) days then BW Broadcast will pay the freight at their discretion. -
Page 6: Safety
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. - Page 7 Adjust the desired power output level using front panel. Check reflected power is OK. That finishes the set-up. A much more detailed explanation is available in the appropriate sections of this manual as well as additional options. You should read through it! Page 7 BW Broadcast technical manual...
- Page 8 That finishes the set-up. A much more detailed explanation is available in the appropriate sections of this manual as well as additional options. You should read through it! IN OUT RF OUT BW Broadcast Transmitter Page 8 BW Broadcast technical manual...
- Page 9 That finishes the set-up. A much more detailed explanation is available in the appropriate sections of this manual as well as additional options. You should read through it! IN OUT IN OUT RF OUT RF OUT BW Broadcast BW Broadcast Transmitter Transmitter Page 9 BW Broadcast technical manual...
- Page 10 Check the documentation that came with your RDS encoder on how to set/check the proper RDS injec- tion level. That finishes the set-up. A much more detailed explanation is available in the appropriate sections of this manual as well as additional options. You should read through it! Page 10 BW Broadcast technical manual...
- Page 11 Check the documentation that came with your RDS encoder on how to set/check the proper RDS injec- tion level. That finishes the set-up. A much more detailed explanation is available in the appropriate sections of this manual as well as additional options. You should read through it! Page 11 BW Broadcast technical manual...
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Page 12: Front And Rear Panels
Introduction FRONT AND REAR PANELS Page 12 BW Broadcast technical manual... -
Page 13: Control And Monitor Lcd
The power amplifier voltage will vary depending on set output power and the presence of any fault conditions which also cut the voltage back and with it the R.F. output. Page 13 BW Broadcast technical manual... -
Page 14: Installation And Setup
The LCD readout will only display frequencies in 100Khz steps. Any frequency offsets derived from the internal 12.5kHz offset switch will not show on the LCD. Consult a frequency counter if using offsets. Page 14 BW Broadcast technical manual... -
Page 15: Power Setup
The windows application has a button that can toggle the RF output of the trans- mitter. Please consult the RS232 section of this manual for more information on controlling the transmitter remotely. FM TRANSMITTER Page 15 BW Broadcast technical manual... -
Page 16: Alarms
More info is found in the following pages of the manual. BW Broadcast can also customise the alarm / fault software to meet the requirements of major broadcasters and networks or supply N+1 solutions. More information on this and other custom features can be obtained from our technical department. -
Page 17: Windows Application
R.F., change the frequency, change the R.F. power and reset any alarm flags that have been set. Remote Control Application 2.43 Terminal control of the transmitter Installation Please see the instructions for your terminal software package to find out how to connect to a remote serial Page 17 BW Broadcast technical manual... -
Page 18: Operation
ENTER Refresh screen screen or by asking for several refresh screens by pressing the 'Enter’ key a few times in succession. Page 18 BW Broadcast technical manual... -
Page 19: Modes Of Operation
Page 19 BW Broadcast technical manual... - Page 20 L and R inputs, will produce proper summed mono operation and no spurious 38kHz signals. Page 20 BW Broadcast technical manual...
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Page 21: Multiplex / Broadband Input
BNC socket. See loopthrough mode below * JUMPERS. J5 (ON), J6 (STEREO), DSW1 (ON / OFF), DSW2 (50 / 75), DSW3 (STEREO), DSW4-8 (OFF) Page 21 BW Broadcast technical manual... - Page 22 This is to stop the internal stereo encoder’s multiplex output signal from being fed to the exciter section internally. More information on loopthrough setup is provided at the end of the advanced setup procedure section. Page 22 BW Broadcast technical manual...
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Page 23: Stereo
5. Connect an audio source to both channels and apply a 400Hz tone with a level of +6dBu. Page 23 BW Broadcast technical manual... -
Page 24: Mono
Otherwise, switch it back to on and set DIP switch 2 to the correct setting for your region, 75µs for the Americas and Japan and 50µs for the rest of the world. Page 24 BW Broadcast technical manual... -
Page 25: Other Setup Considerations
VC1. LCD SYSTEM METERING ACCURACY DISPLAY Measurement Accuracy POWER SUPPLY Volts +/-1 Volt TEMPERATURE Degrees Centigrade +/-1 Degree PEAK DEVIATION +/-1 kHz RF POWER Watts Page 25 BW Broadcast technical manual... -
Page 26: Technical Data
482mm x89mm x 422mm Weight 6.9 kg Voltage input 110 - 260 VAC Current input 110VAC - 4A / 220VAC - 2A Power connector IEC, FUSED and switchable Switched mode approvals UL / TUV / CE Page 26 BW Broadcast technical manual... -
Page 27: Circuit Description
(IC6). The switches are controlled by the microcontroller IC5 and the output from the switches feed into three resistors R82,83,84 to provide a D/A type function producing the multiplex signal. The resistors are carefully chosen to provide sine weighting for the reconstruction, which keeps the lower order harmonic content down to Page 27 BW Broadcast technical manual... - Page 28 D-type from the microcontroller on the LCD board together with connections for the modulation level and a serial interface which provides frequency and status information between the PLL microcontroller on the combo board and the main system microcontroller on the LCD board. Page 28 BW Broadcast technical manual...
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Page 29: Lcd Control Board
R21 and CON1. R22 and C15 provide supply decoupling for the op-amp. C14,15,16,17,18 provide further decoupling and feedback for the power control feedback loop formed around side B of the op-amp. Page 29 BW Broadcast technical manual... -
Page 30: Power Amplifier Board
LCD control board and the combo board, and last but not least the PA power modules control line which controls it’s output voltage. This control signal is derived from the LCD / control board and is wired through the power amplifier PCB and out through CON2 to the power supply module. Page 30 BW Broadcast technical manual... -
Page 31: Block Diagram
Technical data BLOCK DIAGRAM Page 32 BW Broadcast technical manual... - Page 32 Technical data WIRING AND INTERNAL OVERVIEW Page 32 BW Broadcast technical manual...
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Page 33: Schematics
Technical data 3.51 COMBO BOARD SCHEMATICS 3.511 DSP Limiter section Page 34 BW Broadcast technical manual... -
Page 34: Stereo Encoder Section
Technical data 3.512 Stereo encoder section Page 35 BW Broadcast technical manual... -
Page 35: Exciter Section
Technical data 3.513 PLL exciter section Page 36 BW Broadcast technical manual... -
Page 36: Digital Input Section
Technical data 3.514 Digital Input section Page 37 BW Broadcast technical manual... - Page 37 Technical data 3.52 LCD CONTROL BOARD Page 38 BW Broadcast technical manual...
- Page 38 Technical data 3.53 POWER AMPLIFIER BOARD Page 38 BW Broadcast technical manual...
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Page 39: Parts List
6K8 0.1W 0805 Thick Film Resistor 1% 5K6 0.1W 0805 Thick Film Resistor 1% 4K3 0.1W 0805 Thick Film Resistor 1% R91,R96 3K3 0.1W 0805 Thick Film Resistor 1% 120K 0.1W 0805 Thick Film Resistor 1% Page 47 BW Broadcast technical manual... - Page 40 18pF 0805 Multi-layer Ceramic 50V C0G / NP0 Capacitor 4.7uF 0805 Multi-layer Ceramic 25V X5R / X7R Capacitor 39pF 0805 Multi-layer Ceramic 50V Capacitor 1% C105 470nF 0805 Multi-layer Ceramic 50V X7R Capacitor C106 8200pF 0805 Multi-layer Ceramic 50V Capacitor 5% Page 48 BW Broadcast technical manual...
- Page 41 REG1 L7805CV +5V 1A, Linear Fixed Voltage Regulators REG2 L7815CV +15V 1A, Linear Fixed Voltage Regulator TO220 RFT1 28SWG (0.355mm) Blue/Green Bonded Bifilar Enamelled Wire SW1-SW4 10 Step Decimal Rotary PCB Switch Hole Through Page 49 BW Broadcast technical manual...
- Page 42 330nH 10% SMD 1008 Ferrite Inductor Bead Inductor 10% 0805 600R 100MHZ 47nH MidiSpring Inductor 68nH MidiSpring Inductor 4.7mH 10RB Toko Radial Inductor #181LY-472J 3.9mH 10RB Toko Radial Inductor #181LY-392J L13,L14 220uH Axial Inductor Ferrite 5% Tolerance Page 50 BW Broadcast technical manual...
- Page 43 LCD Screen Blue LCD Display 40-Pin 40 Pin IC Socket IC2,IC3 8-Pin 8-Pin IC Socket Panel Buttons Molded Cap for Switch (NOT FITTED) Con1 10-Way 10 Way Boxed Header Con2 16-Way 16 Way Boxed Header Page 51 BW Broadcast technical manual...
- Page 44 Single Diode Silicon schottky BAT42 5mm Pitch Green LED-L-53 series D4,D5 DIODE2 OPTIONAL N Channel Power MOSFET IRL510 5.6A DUALFET BLF278 Power Transistor IC1,IC2 TL072 CA3240EZ 8-pin Op-Amp IC3,IC4 8-Pin 8-Pin IC Holder CON1,CON3 COAXSOCKET MCX PCB Connector Page 44 BW Broadcast technical manual...
- Page 45 Technical data CON2 CONN-H5 OPTIONAL 5-Way 45deg Terminal CON4 CONN-H2 2-Way 45deg Terminal CON5 CONN-DIL10-IDC RA IDC Ribbon Connector CON6 COAXSOCKET NOT FITTED Page 45 BW Broadcast technical manual...
- Page 46 www.bwbroadcast.com...
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