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Broadcast Warehouse TX 25/50 Technical Manual Download Page 39

TX25/50 FM Transmitter technical manual

page 39

Technical data

C72

2.2uF 16V

Miniature Radial Electrolytic

C73

39pF

Ceramic Plate 2.5 pitch (680)

C74

2.2uF 16V

Miniature Radial Electrolytic

C75

12pF

Ceramic Plate 2.5 pitch (680)

C76

100n Y5V

Monolithic Ceramic 2.5  pitch

C77

2.2uF 16V

Miniature Radial Electrolytic

C78

330pF

Ceramic Plate 2.5 pitch (680)

C79

100n Y5V

Monolithic Ceramic 2.5 pitch

C80

100pF

Ceramic Plate 2.5 pitch (680)

C81

330pF

Ceramic Plate 2.5 pitch (680)

C82

330pF

Ceramic Plate 2.5 pitch (680)

C83

-

Not Used 

C84

330pF

Ceramic Plate 2.5 pitch (680)

C85

100n Y5V

Monolithic Ceramic 2.5  pitch

C86

12pF

Ceramic Plate 2.5 pitch (680)

C87

100n Y5V

Monolithic Ceramic 2.5  pitch

C88

47uF 16V

Miniature Radial Electrolytic

C89

470uf 16V

Radial Electrolytic 

C90

470uf 16V

Radial Electrolytic 

C91

2.2uF 16V

Miniature Radial Electrolytic

C92

100n Y5V

Monolithic Ceramic 2.5 pitch

C93

10uF 35V

Miniature Radial Electrolytic

C94

39pF

VC1

5-65pF

Variable capacitor 

MISC

IC1

TL071

Low noise Op-Amp

IC2-3

TL072

Low noise Dual Op-Amp

IC4

TL071

Low noise Op-Amp

IC5

LM13600

Transconductance Amplifier

IC6-7

TL072

Low noise Dual Op-Amp

IC8-9

TL072

Low noise Op-Amp

IC10-11 TL071

Low noise Op-Amp

IC12

DG201-HS

Analog Switch

IC13

16C620A-04P

8 Bit Microcontroller

IC14

TL071

Low noise Op-Amp

IC15

TL071

Low noise Op-Amp

IC16

TL072

Low noise Op-Amp

IC17

PIC16CE623-20P8 Bit Microcontroller

IC18

MC145170-P

PLL synth. Chip

IC19

4066

Analog Switch

IC20

LF351

Bi-Fet op-amp

T1-2

BC327

PNP General Purpose

T3-6

MPHS10

High Speed Switching

T7

2N4427

High Speed Switching

T8-10

BC337

NPN General Purpose

T11

MPSH10

High Speed Switching

J1-12

3 PIN 

3 Pin Jumper Header

FIL1-2 5085

15KHz Block Filters

X1

4.864MHz

HC49 Microprocessor crystal

X2

8.000MHz

HC49 Microprocessor crystal

DC1

NMH1215S

Newport 2W dual output DC 
convertor

RFT1

4 to 1 Tx

4 Turns Blue / Yellow Ferrite/Ring)

SW1-4 DEC ROTA.

Decimal Rotary PCB switches

FB

FB

Axial Ferrite Bead

HEATS. TO5 SINK

Push On T05 Heatsink

8 PIN

8PIN

8 Pin IC Holders X 14

14 PIN 14 PIN

14 Pin IC Holders X 1

16 PIN 16 PIN

16 Pin IC Holders X 3

18 PIN 18 PIN

18 Pin IC Holders X 2

INDUCTORS

L1

3.9mH

10RB Radial Inductor

L2

4.7mH

10RB Radial Inductor

L3

MC120 075

Screened Variable Inductor

L4

S18 2.5T

Moulded Variable Inductor

L5

S18 3.5T

Moulded Variable Inductor

L6

.15uH

Axial Inductor

L7-8

220uH

Axial Inductor

RESISTORS

R1

10K

1/8 Watt Carbon Film

R2

10K

1/8 Watt Carbon Film

R3

10K

1/8 Watt Carbon Film

R4

10K

1/8 Watt Carbon Film

R5

10K

1/8 Watt Carbon Film

R6

10K

1/8 Watt Carbon Film

R7

330K

1/8 Watt Carbon Film

R8

330K

1/8 Watt Carbon Film

R9

10K

1/8 Watt Carbon Film

R10

470R

1/8 Watt Carbon Film

R11

33K

1/8 Watt Carbon Film

R12

1K2

1/8 Watt Carbon Film

R13

1K2

1/8 Watt Carbon Film

R14

330K

1/8 Watt Carbon Film

R15

330R

1/8 Watt Carbon Film

R16

330R

1/8 Watt Carbon Film

R17

1K2

1/8 Watt Carbon Film

R18

100R

1/4 Watt Metal Oxide

R19

12K

1/8 Watt Carbon Film

R20

4K7

1/8 Watt Carbon Film 

R21

220R

1/8 Watt Carbon Film 

R22

1K2

1/8 Watt Carbon Film 

R23

1K2

1/8 Watt Carbon Film 

R24

68R

1/8 Watt Carbon Film 

R25

180R

1/8 Watt Carbon Film 

R26

4K7

1/8 Watt Carbon Film 

R27

470R

1/8 Watt Carbon Film 

R28

10R

1/8 Watt Carbon Film 

R29

4K7

1/8 Watt Carbon Film 

R30

220R

1/8 Watt Carbon Film 

R31

2R2

1/8 Watt Carbon Film 

R32

1K2

1/8 Watt Carbon Film 

R33

1K2

1/8 Watt Carbon Film 

R34

1K2

1/8 Watt Carbon Film 

R35

1K2

1/8 Watt Carbon Film 

R36

1K2

1/8 Watt Carbon Film 

R37

1K2

1/8 Watt Carbon Film 

R38

10R

1/8 Watt Carbon Film 

R39

2K2

1/4 Watt Metal Oxide

R40

1K

1/4 Watt Metal Oxide

R41

560R

1/4 Watt Metal Oxide

R42

820R

1/4 Watt Metal Oxide

R43

75R

1/4 Watt Metal Oxide

R44

12K

1/4 Watt Metal Oxide

R45

1K

1/4 Watt Metal Oxide

R46

36K

1/4 Watt Metal Oxide

R47

7K5

1/4 Watt Metal Oxide

R48

24K

1/4 Watt Metal Oxide

R49

24K

1/4 Watt Metal Oxide

R50

470R

1/4 Watt Metal Oxide

R51

1K

1/4 Watt Metal Oxide

R52

3K3

1/4 Watt Metal Oxide

R53

100K

1/4 Watt Metal Oxide

R54

12K

1/4 Watt Metal Oxide

R55

24K

1/4 Watt Metal Oxide

R56

24K

1/4 Watt Metal Oxide

R57

200R

1/4 Watt Metal Oxide

R58

24K

1/4 Watt Metal Oxide

R59

3K3

1/4 Watt Metal Oxide

R60

12K

1/4 Watt Metal Oxide

R61

7K5

1/4 Watt Metal Oxide

R62

7K5

1/4 Watt Metal Oxide

Summary of Contents for TX 25/50

Page 1: ...written permission from Broadcast Warehouse The information and specifications contained in this document is subject to change at any time without notice Copyright 2001 Broadcast Warehouse For the la...

Page 2: ...jumpers 2 52 Multiplex Broadband Input 2 53 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 3 Technical d...

Page 3: ...ring accuracy nor mally only found on expensive test equipment Local and remote personal computer control and metering are achievable via the innovative dual method RS232 interface The FM modulator se...

Page 4: ...el 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 tha...

Page 5: ...D type pin out Pin 1 PLL failure alarm O C Pin 2 Reserved Pin 3 Reserved Pin 4 R F failure alarm O C Pin 5 R F failure alarm TTL Pin 6 Mod failure alarm TTL Pin 7 PLL failure alarm TTL Pin 8 R F Mute...

Page 6: ...up down buttons will allow power control if internally allowed The maximum output power is governed by the maximum power set adjustment see R F pwr control section If the frequency is set internally w...

Page 7: ...r as 8 represents 100 KHz on the 12 5 KHz switch 8 x 0 125MHz 0 1MHz 100KHz The LCD display on the front panel will display the frequency that you have set on the internal switches If you try to adjus...

Page 8: ...ill allow the LCD screen to provide adjustment of the R F power down from that maximum power set point This can be desir able in transmitter hire situations where you wish to govern the maximum output...

Page 9: ...e RS232 MODULATION FAILURE The Modulation failure alarm will be set if during normal operation the peak deviation of the transmitter drops and remains below 16 KHz The 16 KHz alarm level allows the al...

Page 10: ...your other signals via the push snap terminals a 9 way serial lead from your computer can be plugged into the expansion boards 9 way D type socket The above item is an optional extra and is available...

Page 11: ...software but it should be pretty much straight forward Operation The transmitter will respond to certain key presses and each one has a certain function See the list below for details of what key to p...

Page 12: ...gain as an example You press the R F mute key o and then press refresh screen key ENTER to get a status update The transmitters power control circuitry may not have had time to turn the r f power down...

Page 13: ...ereo 2 5 MODES OF OPERATION The transmitter is fully configurable and can be set up to support various modes of operation The mode of opera tion is set by the configuration of the internal jumpers Thi...

Page 14: ...e There are two different standards in use worldwide In Europe and Africa the standard is normally 50uS This represents a lift of about 3dB at 3 KHz and 10dB at 10 KHz In the Americas and in Japan mor...

Page 15: ...tion This one jumper controls both channels because the gain reduction control voltage which this jumper disables is common to left and right Even with the limiter disabled you may still wish to use t...

Page 16: ...iter module and to the back panel multiplex output BNC socket See loopthrough mode below JUMPERS J1 ON J2 3 50 or 75 J4 5 LOUD or CLARITY J6 7 ON J8 ON J9 10 ON J11 ST J12 OFF Stereo with internal lim...

Page 17: ...ct the signal from the internal limiter and stereo encoder to an external piece of equipment before being reinjected back into the transmitter via the multiplex input socket The most common applicatio...

Page 18: ...tly boost loudness The gain controls on the back panel control the input drive to the limiter module and can be set so that limiting occurs for a given input level Factory setting is at maximum to ena...

Page 19: ...hould now have the multiplex and pilot setup at the correct level All that is left to do is to set the input gain controls to your desired settings For most applications where you require a compressed...

Page 20: ...any form of level control apart from the peak level clippers so we can set the system internal levels correctly 5 We should check that any offsets internal to the limiter are nulled out to keep distor...

Page 21: ...r 75KHz peak deviation at 400Hz The pre emphasis filter can put the 15KHz audio 17db higher than 400Hz We strongly advise you to ensure pre emphasis is built into any external equipment if you decide...

Page 22: ...level feed you may have to turn the gain controls down to stop internal clipping occurring prior to the limiter Please see note on pre emphasis at the end of the section You may also wish the limiter...

Page 23: ...t level required to achieve limiting is frequency dependent due to the characterisTics of the pre emphasis curve There is 17dB more gain into the limiter with a 15KHz input signal compared to a freque...

Page 24: ...d use as simple as possible FREQUENCY FINE TUNE WARNING ADVANCED TECHNICIANS ONLY While the frequency is controlled by the phase locked loop system the stability is governed by the stability of the re...

Page 25: ...approvals 3 25W TX25 5 50W TX50 N type 50 ohm better than 65 dbc 75 dbc 87 5 108 MHz 100KHz from LCD or 12 5 KHz from internal switches Internal switches or LCD system Dual speed Phase locked loop 500...

Page 26: ...Right audio signals are applied to balanced input XLR sockets on the back panel The balanced audio signals are fed to IC1 IC4 which are configured as differential amplifiers to convert the balanced i...

Page 27: ...r is buffered by output op amp IC15 which also provides a fixed output level of 6dbu which is fed to the multiplex output BNC socket on the back panel as well as to one side of the loopthrough jumper...

Page 28: ...ge adjusted over approx 1 to 28 volt range The RF output side of L4 and its network of series and shunt capactiors consisting of C18 21 provide impedance matching to the input of the elliptical low pa...

Page 29: ...nto the LCD display by the LCD control bits on PORTC PORTE 3 bits has the remaining A D inputs Bit 0 is the PA volts Bit 1 is the Rev RF power and bit 2 is for the PA temperature The Microcontrollers...

Page 30: ...TX25 50 FM Transmitter technical manual page 30 Technical data 3 3 BLOCK DIAGRAM...

Page 31: ...ils W1 yellow green 16 0 2 W2 blue 24 0 2 W3 brown 24 0 2 W4 red 24 0 2 tri rated W5 yellow 24 0 2 W6 black 24 0 2 tri rated W7 black 24 0 2 W8 red 24 0 2 FILTERED IEC MAINS SOCKET RF MOD MON BNC S RG...

Page 32: ...TX25 50 FM Transmitter technical manual page 32 Technical data 3 51 LCD control board...

Page 33: ...TX25 50 FM Transmitter technical manual page 33 Technical data 3 52 Power amplifier board...

Page 34: ...TX25 50 FM Transmitter technical manual page 34 Technical data 3 531Combo board limiter section...

Page 35: ...TX25 50 FM Transmitter technical manual page 35 Technical data 3 532 Combo board stereo encoder section...

Page 36: ...TX25 50 FM Transmitter technical manual page 36 Technical data 3 533 Combo board PLL exciter section...

Page 37: ...or IC1 PIC16F877 40 pin 8 Bit micro Controller IC2 CA3240 op amp T1 TIP32A PNP Transistor SW1 3 BUTTONS Blue buttons CON1 10W IDC IDC boxed header CON2 16W IDC IDC boxed header LCD1 122x32 NAN YA LMD6...

Page 38: ...0uF 16V Monolithic Ceramic 2 5 pitch C13 2 2 uF 16V Miniature Radial Electrolytic C14 100n Y5V Monolithic Ceramic 2 5 pitch C15 82pF Ceramic Plate 2 5 pitch 680 C16 100n Y5V Monolithic Ceramic 2 5 pit...

Page 39: ...n IC Holders X 14 14 PIN 14 PIN 14 Pin IC Holders X 1 16 PIN 16 PIN 16 Pin IC Holders X 3 18 PIN 18 PIN 18 Pin IC Holders X 2 INDUCTORS L1 3 9mH 10RB Radial Inductor L2 4 7mH 10RB Radial Inductor L3 M...

Page 40: ...l Oxide R103 5K1 1 4 Watt Metal Oxide R104 5K3 1 4 Watt Metal Oxide R105 100R 1 4 Watt Metal Oxide R106 3K6 1 4 Watt Metal Oxide R107 11K 1 4 Watt Metal Oxide R108 75R 1 4 Watt Metal Oxide R109 10K 1...

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