Broadcast Warehouse TX 25/50 Technical Manual Download Page 38

TX25/50 FM Transmitter technical manual

page 38

Technical data

C12

100U

Electrolytic 63V Radial

C13

10N

Disc Ceramic 2.5mm pitch

C14

10N

Disc Ceramic 2.5mm pitch

C15

10N

Disc Ceramic 2.5mm pitch

C16

2N2

SMD

C17

2N2

SMD

C18

47PF

Disc Ceramic 2.5mm pitch

C19

47PF

Disc Ceramic 2.5mm pitch

C20

47PF

Disc Ceramic 2.5mm pitch

C21

39PF

Minature low K 2.5mm pitch

C22

-

NOT FITTED

C23

47PF

Disc Ceramic 2.5mm pitch

C24

39PF

Minature low K 2.5mm pitch

C25

8P2

Ceramic 2.5 pitch

C26

18P

Minature low K 2.5mm pitch

C27

22P

Disc Ceramic 2.5mm pitch

C28

12P

Minature low K 2.5mm pitch

C29

22P

Disc Ceramic 2.5mm pitch

C30

3.3P

Disc Ceramic 2.5mm pitch

C31

1N

High Voltage

C32

100U

Electrolytic 63V Radial

C33

100U

Electrolytic 63V Radial

C34

10N

Disc Ceramic 2.5mm pitch

C35

10N

Disc Ceramic 2.5mm pitch

C36

10N

Disc Ceramic 2.5mm pitch

C37

10N

Disc Ceramic 2.5mm pitch

C38

10N

Disc Ceramic 2.5mm pitch

C39

10N

Disc Ceramic 2.5mm pitch

C40

10N

Disc Ceramic 2.5mm pitch

INDUCTORS

L1

4 TURN COIL

0.9mm silvered copper wire

L2

2 TURN COIL

0.9mm silvered copper wire

L3

COIL

S18 Orange Toko

L4

2 TURN COIL

18 Gauge silvered copper wire

L5

2 TURN COIL

18 Gauge silvered copper wire

L6

COIL

S18 Red Toko

L7

COIL

S18 Red Toko

L8

FB

Axial Ferrite bead

MISC

REG1

7818

18 V 1A Regulator

IC1

CA3240

op-amp

IC2

CA3240

op-amp

T1

SRFE1130P

RF Power Transistor

D1

BAT42

Rectifier Diode

D2 BAT42

Rectifier 

Diode

TS1

LM335Z

Temperature sensor

CON1

PCB MCX

MCX connector

CON2

PCB MCX

MCX connector

CON3

5Term

5 Way Screwless Terminal

CON4

4Term

4 Way Screwless Terminal

CON5

10Way

IDC Box Header 90 degree

RFT1

RFT

VSWR Coupler Toroid

3.63 Combo board

CAPACITORS

C1

2.2 uF 16V

Miniature Radial Electrolytic

C2

2.2 uF 16V

Miniature Radial Electrolytic

C3

100n Y5V

Monolithic Ceramic 2.5 pitch

C4

39pF 

Ceramic Plate 2.5 pitch (680)

C5

2.2 uF 16V

Miniature Radial Electrolytic

C6

470uF 16V

Radial Electrolytic 

C7

470uF 16V

Radial Electrolytic 

C8

2.2 uF 16V

Miniature Radial Electrolytic

C9

2.2 uF 16V

Miniature Radial Electrolytic

C10

82pF

Ceramic Plate 2.5 pitch (680)

C11

100n Y5V

Monolithic Ceramic 2.5 pitch

C12

100uF 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 pitch

C17

100uF 16V

Radial Electrolytic

C18

100uF 16V

Radial Electrolytic

C19

1n

Gen. Pur. Ceramic Disc 2.5 pitch

C20

220pF

Ceramic Plate 2.5 pitch (680)

C21

4p7

Ceramic Plate 2.5 pitch (680)

C22

27pF

Ceramic Plate 2.5 pitch (680)

C23

56pF

Ceramic Plate 2.5 pitch (680)

C24

82pF

Ceramic Plate 2.5 pitch (680)

C25

1n

Gen. Pur. Ceramic Disc 2.5 pitch

C26

100n Y5V

Monolithic Ceramic 2.5 pitch

C27

82pF

Ceramic Plate 2.5 pitch (680)

C28

100n Y5V

Monolithic Ceramic 2.5 pitch

C29

100n Y5V

Monolithic Ceramic 2.5 pitch

C30

27pF

Ceramic Plate 2.5 pitch (680)

C31

12pF

Ceramic Plate 2.5 pitch (680)

C32

56pF

Ceramic Plate 2.5 pitch (680)

C33

1n

Gen. Pur. Ceramic Disc 2.5 pitch

C34

33pF

Ceramic Plate 2.5 pitch (680)

C35

Not Used

C36

100n Y5V

Monolithic Ceramic 2.5 pitch

C37

Not Used

C38

47pF

Ceramic Plate 2.5 pitch (680)

C39

47pF

Ceramic Plate 2.5 pitch (680)

C40

100n Y5V

Monolithic Ceramic 2.5 pitch

C41

100n Y5V

Monolithic Ceramic 2.5 pitch

C42

47pF

Ceramic Plate 2.5 pitch (680)

C43

47pF

Ceramic Plate 2.5 pitch (680)

C44

100n Y5V

Monolithic Ceramic 2.5 pitch

C45

4n7

Polycarbonate 5mm Pitch

C46

6n8

Polycarbonate 5mm Pitch

C47

6n8

Polycarbonate 5mm Pitch

C48

4n7

Polycarbonate 5mm Pitch

C49

27pF

Ceramic Plate 2.5 pitch (680)

C50

47pF

Ceramic Plate 2.5 pitch (680)

C51

100n Y5V

Monolithic Ceramic 2.5 pitch

C52

47pF

Ceramic Plate 2.5 pitch (680)

C53

27pF

Ceramic Plate 2.5 pitch (680)

C54

47uF 16V

Miniature Radial Electrolytic

C55

10uF 16v

Miniature Radial Electrolytic

C56

47pF

Ceramic Plate 2.5 pitch (680)

C57

47uF 16V

Miniature Radial Electrolytic

C58

27pF

Ceramic Plate 2.5 pitch (680)

C59

27pF

Ceramic Plate 2.5 pitch (680)

C60

100n Y5V

Monolithic Ceramic 2.5 pitch

C61

100n Y5V

Monolithic Ceramic 2.5 pitch

C62

47uF 16V

Miniature Radial Electrolytic

C63

47uF 16V

Miniature Radial Electrolytic

C64

330pF

Ceramic Plate 2.5 pitch (680)

C65

330pF

Ceramic Plate 2.5 pitch (680)

C66

100n Y5V

Monolithic Ceramic 2.5 pitch

C67

47uF 16

Miniature Radial Electrolytic

C68

100n Y5V

Monolithic Ceramic 2.5 pitch

C69

100n Y5V

Monolithic Ceramic 2.5 pitch

C70

47uF 16V

Miniature Radial Electrolytic

C71

100n Y5V

Monolithic Ceramic 2.5  pitch

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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