Superior Broadcast SBFM100-SS User Manual

Superior Broadcast LLC

Superior Broadcast

SBFM100-SS

User Manuals

Superior Broadcast LLC

18208 Preston Rd. Suite D9-297, Dallas, TX 75252. www.sbp-tv.com

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Superior Broadcast

18208 Preston Rd, Suite D9-297, Dallas, TX 75252

Tel: 972-473-2577 | Email: [email protected]

www.sbp-tv.com

Printed and bound in the U.S.A . No part of this manual may be reproduced, memorized or transmitted

in any form or by any means, electronic or mechanic, including photocopying, recording or by any

information storage and retrieval system, without written permission of the copyright owner.

Tel: 972-473-2577 | Email: [email protected]

18208 Preston Rd. Suite D9-297, Dallas, TX 75252. www.sbp-tv.com

SBFM100SS Transmitter User Manual

Superior Broadcast

Jimmie Joynt

Superior Broadcast

Superior Boadcast SBFM100SS Transmitter

TEX30/50/100/150/300/502/702-LCD

ELETTRONICA

Table of Contents

1. Preliminary Instructions 1

2. Warranty 1

3. First Aid 2

3.1 Treatment of electrical shocks 2

3.2 Treatment of electrical Burns 2

4. General Description 3

4.1 Unpacking 3

4.2 Features 3

4.3 Frontal Panel Description 5

4.4 Rear Panel Description 6

4.5 Connectors Description 7

4.6 Technical Description 9

5. Quick guide for installation and use 10

5.1 Preparation 10

5.2 First power-on and setup 12

5.3 Operation 14

5.4 Management Firmware 16

5.5 Optional Function 22

 6. Identication and Access to the Modules 24

 6.1  Identication of the Modules 24

7. Working Principles 28

7.1 TEX30/50/00/50/300/502/702LCD Common Parts 28

7.2 TEX30LCD Different Parts 29

7.3 TEX50/100/50LCD Different Parts 30

7.4 TEX300LCD Different Parts 32

7.5 TEX502/702LCD Different Parts 33

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SBFM100SS Transmitter User Manual

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ATVST-CNV

IMPORTANT

The lightning ash with arrowhead, within a triangle, is intended to alert the user of the presence

of dangerous voltage that may constitute a risk of electric shock.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the equipment.

1. Preliminary Instructions

• General foreword The equipment in object is to considering for uses,

installation and maintenance from “trained” or “qualied” staff, they conscious

of the risks connected to operate on electronic and electrical circuits electrical.

The “trained” denition means staff with technical knowledge about the use of the equipment and with responsibility regarding the own safety and the other not qualied staff safety place under his directed surveillance in case of works on the equipment. The “qualied” denition means staff with instruction and experience about the use of the equipment and with responsibility regarding the own safety and the other not qualied staff safety place under his directed surveillance in case of works on the equipment.

WARNING: The machine can be equipped with an ON/OFF switch which could not remove completely voltages inside the machine. It is necessary to have disconnected the feeding cord, or to have switched off the control panel, before to execute technical operations, making sure himself that the safety connection to ground is connected. The technical interventions that expect the equipment inspection with circuits under

voltage must be carry out from trained and qualied staff in presence of

a second trained person that it is ready to intervene removing voltage in case of need.

Superior Broadcast doesn’t assume responsibility for injury or damage

resulting from improper procedures or practices by untrained/unqualied

personnel in the handling of this unit.

WARNING: The equipment is not water resistant and an inltration could seriously compromise its correct operation. In order to prevent res or electric shocks, do not expose the equipment to rain, inltrations or

humidity.

Please observe all local codes and re protection standards during installation

and use of this unit.

WARNING: The equipment has to its inside exposed parts to risk of electric

shock, always disconnect power before opening covers or removing any part

of this unit.

Fissures and holes are supplied for the ventilation in order to assure a reliable efcacy of the product that for protect itself from excessive heating, these ssures do not have to be obstructed or to be covered. The ssures doesn’t be

obstructed in no case. The product must not be incorporated in a rack, unless

it is supplied with a suitable ventilation or that the manufacturer’s instructions

are been followed.

WIRING: This device has a connection to ground on the power cord and on the chassis. Check that they are correctly connected.

Operate with this device in a residential ambient can cause radio disturbs;

in this case, it can be demanded to the user to take adequate measures.

Specications and informations contained in this manual are furnished for information only, and are subject to change at any time without notice, and should not be construed as a commitment by Superior Broadcast.

The Superior Broadcast assumes no responsability or liability for any errors or inaccuracies that may appear in this manual, including the products and software described in it;and it reserves the right to modify the design and/ or the technical specications of the product and this manual without notice.

• Warning regarding the use designated and the use limitations of the product.

This product is an transmitter radio indicated for the audio broadcasting

service in frequency modulation. It uses working frequencies that are not

harmonized in the states of designated user. The user of this product must

obtain from the Authority for spectrum management in the state of designated

user the appropriate authorization to use the radio spectrum, before putting

in exercise this equipment. The working frequency, the transmitter power, let alone other specications of the transmission system are subject to limitation and denited in the authorization obtained.

2. Warranty

Superior Broadcast guarantees absence of manufacturing defect and the

good operation for the products, within the provided terms and conditions. Please read the terms carefully, because the purchase of the product or acceptance of order conrmation, constitutes acceptance of the terms and conditions. For the last legal terms and conditions, please visit our web site www.sbp-tv.com) wich may also be changed, removed or updated for any reason without prior notice. Warranty will be void in cases of opened products, physical damage, misuse, modication, repair by unauthorised persons, carelessness and using the product for other purpose than its intended use. In

case of defect, proceed like described in the following:

1. Contact the dealer or distributor where you purchased the unit. Describe the problem and, so that a possible easy solution can be

detected.

Dealers and Distributors are supplied with all the information about problems

that may occur and usually they can repair the unit quicker than what the manufacturer could do. Very often installing errors are discovered by dealers.

2. If your dealer cannot help you, contact Superior Broadcast and explain the problem. If it is decided to return the unit to the factory, Superior Broadcast will mail you a regular authorization with all the necessary instructions to send back the goods;

WIRING: This equipment can irradiate radio frequency energyand if it’s not installed following the instructions contained in the manual and local regulations it could generate interferences in radio communications

Superior Broadcast

3. When you receive the authorization, you can return the unit. Pack it carefully for the shipment, preferably using the original packing and seal the package perfectly. The customer always assumes the risks of loss

(i.e.,

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Superior Broadcast. is never responsible for damage or loss), until the package reaches R.V.R. premises. For this reason, we suggest you to insure the goods for the whole value. Shipment must be effected C.I.F. (PREPAID) to the address specied by Superior Broadcast’s service manager on the

authorization

DO NOT RETURN UNITS WITHOUT OUR AUTHORIZATION AS THEY WILL BE REFUSED

4 Be sure to enclose a written technical report where mention all the

problems found and a copy of your original invoice establishing the starting date of the warranty.

Replacement and warranty parts may be ordered from the following address.

Be sure to include the equipment model and serial number as well as part description and part number. Superior Broadcast 18208 Preston Rd, Suite D9-297 Dallas, TX 75252 Tel: 972-473-2577

3. First Aid

The personnel employed in the installation, use and maintenance of the device, shall be familiar with theory and practice of rst aid.

3.1 Treatment of electrical shocks

3.1.1 If the victim is not responsive

Follow the A-B-C’s of basic life support.

• Place victim at on his backon a hard surface.

• Open airway: lift up neck, push forehead back

(Figure 1).

Figure 5

• In case of only one rescuer, 15 compressions alternated to two

breaths.

• If there are two rescuers, the rythm shall be of one brath each 5

compressions.

• Do not interrupt the rythm of compressions when the second person is giving breath.

• Call for medical assistance as soon as possible.

3.1.2 If victim is responsive

• Keep them warm.

• Keep them as quiet as possible.

• Loosen their clothing (a reclining position is recommended).

• Call for medical help as soon as possible.

3.2 Treatment of electrical Burns

3.2.1 Extensive burned and broken skin

• Cover area with clean sheet or cloth.

• Do not break blisters, remove tissue, remove adhered particles of clothing, or apply any salve or ointment.

• Treat victim for shock as required.

• Arrange transportation to a hospital as quickly as possible.

• If arms or legs are affected keep them elevated.

Figure 1

• clear out mouth if necessary and observe for breathing

• if not breathing, begin articial breathing (Figure 2): tilt head,

pinch nostrils, make airtight seal, four quick full breaths Remember mouth to mouth resuscitation must be commenced as soon as possible.

Figure 2

• Check carotid pulse (Figure 3); if pulse is absent, begin articial circulation (Figure 4) depressing sternum (Figure 5).

If medical help will not be available within an hour and the victim is conscious and not vomiting, give him a weak solution of salt and soda: 1 level teaspoonful of salt and 1/2 level teaspoonful of baking soda to each quart of water (neither hot or cold).

Allow victim to sip slowly about 4 ounces (half a glass) over a period of 15

minutes.

Discontinue uid if vomiting occurs.

DO NOT give alcohol.

3.2.2 Less severe burns

• Apply cool (not ice cold) compresses using the cleansed available

cloth article.

• Do not break blisters, remove tissue, remove adhered particles of

clothing, or apply salve or ointment.

• Apply clean dry dressing if necessary.

• Treat victim for shock as required.

• Arrange transportation to a hospital as quickly as possible.

• If arms or legs are affected keep them elevated.

Figure 3 Figure 4

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4. General Description

The TEX30/50/100/150/300/502/702LCD, manufactured by R.V.R. Elettronica SpA, are exciters for Frequency Modulated audio broadcasting in a frequency

modulation able to transmit in the band between 87.5 and 108 MHz, in step of 10 KHz, with an RF output power adjustable up to a maximum of 30, 50, 100, 150, 300, 500 and 700 W respectively into a 50 Ohm standard load.

The TEX30/50/100/150/300/502/702LCD are designed to being contained into a 19” rack box of 2HE.

4.1 Unpacking

The package contains: 1 TEX30LCD, TEX50LCD, TEX100LCD, TEX150LCD, TE300LCD, TEX502LCD

or TEX702LCD

1 User Manual 1 Mains power cables

The following accessories are also available from Your R.V.R. Dealer:

• Accessories, spare parts and cables

4.2 Features

These exciters contain a low-pass lter that reduces the harmonic emission to

provided for by international standards (CCIR, FCC or ETSI) and can be connected directly to the antenna.

Two major features of TEX30/50/100/150/300/502/702LCD are compact design and user-friendliness. Design is based on a modular concept: the different functions are performed by modules that, for the most part, are connected through male and facilitates maintenance and module replacement.

The RF power section of the TEX30LCD features a MOSFET module delivering up to 30W output power, the TEX50/100/150LCD features a delivering up to 150W output power, the TEX300LCD features a MOSFET module delivering up to 300W output power, whereas the TEX502LCD features two MOSFET modules with up to 350 W output power each; the TEX702LCD features a MOSFET module delivering up to 800W output power

MOSFET module

Operating frequency stability is ensured by a temperature-compensated reference oscillator and is maintained by a PLL (Phase Locked Loop) system. The exciters will go into frequency lock within 30 seconds after power-on.

The TEX30/50/100/150/300/502/702LCD can operate throughout the frequency bank with no need for calibration or set-up.

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An LCD on the front panel and a push-button board provide for user interfacing with the microprocessor control system, which offers the following features:

• Output power setup.

• Operating frequency setup.

• Power output enable/disable.

• Power Good feature (User-selectable output power alarm threshold).

• Measurement and display of transmitter operating parameters.

• Communication with external devices such as programming or telemetry

systems via RS232 serial interface or I

Four LEDs on the front panel provide the following status indications: ON, LOCK, FOLDBACK and RF MUTE.

The exciters have an input for the external 24 Vcc supply. This auxiliary supply source, that can be realized by the user with the help of rescue batteries, is automatically used in case of AC voltage absence.

2

C.

The exciter management rmware is based on a menu system. User has four

navigation buttons available to browse submenus:

ESC , , , ed ENTER.

The rear panel features the mains input connectors, as well as audio input connectors and RF output connector, telemetry connector, protection fuses and two inputs for signals modulated onto subcarriers by suitable external coders, such as RDS (Radio Data System) signals commonly used in Europe.

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ELETTRONICA

4.3 Frontal Panel Description

[1] AIR FLOW Air ow for the forced ventilation.

[2] ON Green LED, lit when the exciter is working. [3] LOCK Green led, lit when the PLL is locked on the working frequency. [4] FOLDBACK Yellow LED, lit when the foldback function is operating (automatic

reduction of the delivered RF power).

[5] R.F. MUTE Yellow LED, lit when the exciter’s power output is inhibited by an

external interlock command. [6] CONTRAST Display contrast adjusting trimmer (on the top of the equipment). [7] ESC Push button to exit from a menu. [8] Push button to move in the menu system and to modify the

parameters. [9] Push button to move in the menu system and to modify the

parameters.

[10] ENTER Push button to conrm a parameter and to enter in a menu.

[11] DISPLAY Liquid crystals display. [12] POWER ON/OFF switch.

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ELETTRONICA

4.4 Rear Panel Description

[1] PLUG VDE plug for mains supply. [2] VENTOLA Fan for the forced ventilation of the exciter.

[3] R.F. OUTPUT RF output connector, N-type, 50Ω.

[4] 24 VDC IN- External 24Vdc supply input. Negative (black). Only for

TEX30/50/100/150LCD.

[5] 24 VDC IN- External 24Vdc supply input. Positive (red). Only for TEX30/

50/100/150LCD.

[6] INTERLOCK OUT Connettore BNC di interlock in uscita: quando l’eccitatore

entra in modalità stand-by, il conduttore centrale,

normalmente ottante, viene posto a massa

[7] FWD EXT. AGC Trimmer for the control of the delivered power in function of

the FWD fold input.

[8] RFL EXT. AGC Trimmer for the control of the delivered power in function of

the RFL fold input. [9] REMOTE DB15 connector for telemetry of the machine. [10] GSM ANT Reserved for Future Uses - SMA connector for GSM

Antenna. [11] PHASE ADJ Pilot tone phase adjustment trimmer. [12] MODE/MPX IMP Dip-switch to set the operation mode (STEREO or MONO)

and the MPX input impedance, 50Ω or 10kΩ.

[13] SCA/RDS BNC connector, SCA/RDS unbalanced input. [14] MPX BNC connector, MPX unbalanced input. [15] MPX ADJ Adjustment trimmer for MPX input. [16] SCA/RDS ADJ Adjustment trimmer for SCA/RDS input. [17] RIGHT ADJ Adjustment trimmer for the Right channel input. [18] RIGHT XLR connector, balanced Right channel input. [19] FUSE BLOCK Fuse carrier.Use a screwdriver to access the fuse. [20] R.F. TEST RF test output, approx. 13 dBm wrt the RF output power

level. Not suitable for spectral analysis. [21] MODEM DB9 connector connected to GSM modem (only with

telemetry option). [22] I

2

C BUS Normally not used, or used for customized functions (only

with telemetry option). [23] RS232 DB9 connector for direct serial communication or modem

(only with telemetry option). [24] SERVICE DB9 connector for interconnection with other devices

and for factory parameters programming (only for factory

programming). [25] EXT REF 10MHz Fine regulation trimmer for frequency transmission.

Optionally, Sync signal input BNC connector for external

devices.

[26] PREEMPHASIS Dip-switch to set the preenphasys at 50 or 75 μs. The

preenphasys setting is relevant only for the Left and Right

inputs in stereo mode and for the mono input in mono mode,

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while MPX input is unaffected by this setting.

[27] 19 kHz PILOT OUT BNC output for the 19 kHz pilot tone. This can be used for

external devices (e.g. RDS coders) synchronization. [28] SCA2 BNC connector, SCA2 unbalanced input. [29] SCA2 ADJ Adjustment trimmer for SCA2 input. [30] LEFT-MONO ADJ Adjustment trimmer for Left-Mono channel input. [31] LEFT-MONO XLR connector, balanced Left-Mono channel input.

[32] IMPEDANCE Dip-switch to set the balanced input impedance, 600Ω or

10kΩ.

4.5 Connectors Description

4.5.1 RS232

Type: Female DB9

1 NC 2 SDA 3 SCL 4 NC 5 GND 6 NC 7 NC 8 NC 9 NC

4.5.2 Service (for programming of factory parameters)

Type: Female DB9

1 NC 2 TX_D 3 RX_D 4 Internally connected with 6 5 GND 6 Internally connected with 4 7 Internally connected with 8 8 Internally connected with 7 9 NC

4.5.3 I2C Bus

Type: Male DB9

1 NC 2 TX_D 3 RX_D 4 Internally connected with 6 5 GND 6 Internally connected with 4 7 Internally connected with 8 8 Internally connected with 7 9 NC

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(MONO) / Right

Type: Female XLR

1 GND 2 Positive 3 Negative

Type: Female DB15

Pin Name Type Meaning 1 Interlock IN By passes power if closed at GND 2 Ext AGC FWD IN Ext. signal,1-12V, for power

limitation (AGC) 3 GND Ground 4 SDA IIC I/O IIC communication serial data 5 VPA Tlm ANL OUT PA power supply voltage 3,9V F.S. 6 FWD Tlm ANL OUT Forward power 3,9V F.S. 7 Power Good DIG OUT Open collector, enabled whenpower exceeds the set threshold 8 GND Ground 9 GND Ground 10 Ext AGC RFL IN Ext. signal.,1-12V, for power

limitation (AGC) 11 SCL IIC I/O IIC communication clock 12 IPA Tlm ANL OUT PA power supply current 3,9V F.S.

13 RFL Tlm ANL OUT Reected power 3,9V F.S.

14 On cmd DIG IN One grounded pulse (500 ms) enables power supply 15 OFF cmd DIG IN One grounded pulse (500 ms) disables power supply

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4.6 Technical Description

Parameters

TEX30LCD TEX50LCD TEX100LCD TEX150LCD TEX300LCD TEX502LCD TEX702LCD

GENERAL S

Rated output power 30W 50W 100W 150W 300W 500W 700W

Frequency range

Operational Mode

Modulation type

Primary Power

80 ÷ 260 Vac or 24

AC Power Consumption 130 VA / 70W 200 VA /100W 330 VA / 212 W 440 VA / 260 W 560 VA / 520 W 970VA / 940W 1280VA / 1240W

Phisical Dimensions (W x H x D)

Weight 7 kg 8,5 kg 8,5 kg 8,5 kg 9,5 kg 10 kg 10 kg

Environmental Working Conditions

Cooling

Frequency programmability

Frequency stability

Pre-emphasis mode

Spurious & harmonic suppression

Asynchronous AM S/N ratio ≥ 65 dB (typical 70)

Synchronous AM S/N ratio ≥ 50 dB (typical 60)

MONO OPE RATION

S/N FM Ratio

Frequency Response

Total Harmonic Distortion

Intermodulation distortion

MPX OPERA TION

Composite S/N FM Ratio

Frequency Response

Total Harmonic Distortion

Intermodulation distortion

INTERNA L STEREO CODER O

PERATIO N

Stereo S/N FM Ratio

Frequency Response

Total Harmonic Distortion

Intermodulation distortion

Stereo separation

AUDIO INPUT CO NNECTORS

Left / Right

MPX unbalanced/RDS

SCA/RDS

OTHER CONNECTO RS

RF Output

RF Monitor

Pilot output

Interlock Input

STANDA RD COMPLI ANCE

Safety

EMC

Radio

BNC (- 30dBr referred to RF output )

BNC (1Vpp)

BNC

> 50 dB 30 Hz ÷ 15 kHz (typical 55 dB)

XLR balanced; Impedance: 10 k or 600 ohm; Level: -13 to +13 dBu

BNC unbalanced; Impedance: 10 k or 50 ohm; Level: -13 to +13 dBu

2 x BNC unbalanced; Impedance: 10 k; Level: -8 to +13 dBu

N (50 ohm)

< 0.1% 30Hz ÷ 53kHz

< 0.05% with 1 kHz and 1,3 kHz tones

> 75 dB RMS (typical 78dB)

± 0.5 dB 30 Hz ÷ 15 kHz

< 0.05% 30 Hz ÷ 15 kHz

≤ 0.03% with 1 kHz and 1,3 kHz tones

> 80 dB RMS (typical 85 dB)

< ± 0.5 dB 30Hz ÷ 15kHz (typical ± 0.2 dB)

< 0.1 % 30 Hz ÷ 15 kHz (typical 0.07 %)

< 0.02 % with 1 kHz and 1,3 kHz tones

> 80 dB RMS (typical 85 dB)

± 0.2 dB 30Hz ÷ 53kHz / ± 0.5 dB 53kHz ÷ 100 kHz

EN 301 489-1 V1.4.1 (2002-08)

EN 301 489-11 V1.2.1 (2002-11)

EN 302 018-2 V1.2.1 (2005-06)

80 ÷ 260 Vac

-10 ÷ +50 °C / 95% relative Humidity non condensing

Forced, with internal fan

From software, with 10 kHz steps

±1 ppm

≥ 50 dB (typical 55)

EN 60215:1989 EN60215/A1:1992-07 EN60215/A2:1994-09

≥ 50 dB (typical 58)

FCC -CCIR - OIRT - JPN

0/50 (CCIR) μS, 75 (FCC) μS

<75 dBc (80 typical)

≥ 60 dB (typical 65)

Mono, Stereo, Multiplex

F3E

483 x 88 x 394 mm

115 / 230 ±15% or 28 Vdc

≥ 60 dB (typical 68)

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ELETTRONICA

5. Quick guide for installation and use

This section provides a step-by-step description of equipment installation and

conguration procedure. Follow these procedures closely upon rst power-on and each time any change is made to general conguration, such as when a new

transmission station is added or the equipment is replaced.

Once the desired conguration has been set up, no more settings are required

for normal operation; at each power-up (even after an accidental shutdown),

the equipment defaults to the parameters set during the initial conguration

procedure.

The topics covered in this section are discussed at greater length in the next

sections, with detailed descriptions of all hardware and rmware features and

capabilities. Please see the relevant sections for additional details.

IMPORTANT: When conguring and testing the transmitter in which the equipment

is integrated, be sure to have the Final Test Table supplied with the equipment ready at hand throughout the whole procedure; the Final Test Table lists all operating parameters as set and tested at the factory.

5.1 Prepation

5.1.1 Preliminary checks

Unpack the exciter and immediately inspect it for transport damage. Ensure that all connectors are in perfect condition.

The main fuse can be accessed from the outside on the rear panel. Extract the fuse carrier with a screwdriver to check its integrity or for replacement, if necessary. The fuse to be used is this type:

Fusibile principale

TEX30LCD @ 90÷260 Vac

(1x) 3.15A tipo 5x20

TEX50/100/150LCD @ 230 Vac/115 Vac

(1x) 6.3A tipo 5x20

TEX300/502/702LCD @ 230 Vac/115 Vac

(1x) 8A tipo 5x20

Table 5.1: Fuses

Provide for the following (applicable to operating tests and putting into service): √ Single-phase 230 VAC or 115 VAC (-15% / +10%) mains power supply for

TEX50/100/150LCD, or 80÷260 VAC full-range mains power supply for TEX30/ 300/502/702LCD, with adequate earth connection.

√ For operating tests only: dummy load with 50 Ohm impedance and adequate

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capacity (30W for TEX30LCD, 50W for TEX50LCD, 100W for TEX100LCD,

150W for TEX150LCD, 300W for TEX300LCD, 500W for TEX502LCD or 700W for TEX702LCD as a minimum).

√ Connection cable kit including:

• Mains power cable

• Coaxial cable with BNC connectors for interlock signal connection

• RF cable for output to load / antenna (50 Ohm coaxial cable with N-type connector)

• Audio cables between transmitter and audio sources.

5.1.2 Connections

Connect the RF output of the transmitter to the antenna cable or a dummy load

capable of dissipating amplier output power. To begin with, set exciter to minimum

output power and switch it off.

Connect the transmitter INTERLOCK IN input to the matching INTERLOCK OUT

output tted on R.V.R. Elettronica equipment to act as hybrid couplers. If your

equipment is a different brand, identify an equivalent output.

WARNING: Electric shock hazard! Never handle the RF output connector

when the equipment is powered on and no load is connected. Injury or death

may result.

Ensure that the POWER switch on the front panel of TEX30/50/100/150/300/502/ 702LCD is set to “OFF”.

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Figure 5.2: connections with amplier

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The exciter has two switches: one is embedded in VDE socket for mains power

cord and interrupts all mains power supply of the machine, while the second is on the front panel and acts by inhibiting the switching power supply of the machine.

Connect the mains power cable to the MAINS connector on the rear panel.

Note: the mains must be equipped with adequate earth connection properly

connected to the equipment. This is a pre-requisite for ensuring operator safety and correct operation.

Connect the audio and RDS/SCA signals from user’s sources to the transmitter input connectors.

5.2 First power-on and setup

Seguire le istruzioni riportate di seguito nel caso di prima accensione o dopo aver

effettuato un cambiamento alla congurazione dell’eccitatore nel quale questo

componente è integrato.

Note : Standard factory settings are RF output power off (Pwr OFF) and regulated

output power set to upper limit (unless otherwise specied by customer).

5.2.1 Power-on

When you have performed all of the connections described in the previous paragraph, power on the exciter using the suitable power switch on the front panel.

5.2.2 Power check

Ensure that the ON LED turns on. Equipment name should appear briey on the display, followed by forward power and modulation readings. If the RF output is disabled, those readings will be zero.

When the PLL locks to operating frequency, the LOCK LED will turn on.

5.2.3 How to enable the RF output

Check output power level and set it to maximum level (unless it has already been set) from the Power Setup menu that you will have accessed by pressing the following sequence of key: ESC (opens Default Menu) ⇒ ENTER (hold down for 2 seconds) ⇒ SET ⇒ use keys to set bar to upper limit (gure 5.2 - menu 2).

Check the state of the Pwr output power by the Fnc menu. If it is set to OFF, press ENTER to bring the selection to ON.

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5.2.4 Controllo del livello di potenza di uscita

Note: The exciter incorporates Automatic Gain Control (AGC) and output power is

modulated based on the power level set by the user and actual operating conditions,

such as temperature, reected power and other parameters. Please read section

5.3 for more details of RF power modulation.

Access the Power Setup Menu pressing the following keys in the order:

ESC (opens Default Menu) ⇒ ENTER (hold down for 2 seconds)

Use the keys

and in the SET menu to set exciter output power; the setting bar at the side of SET provides a graphic indication of power setting; please consider that the forward power readout provided on the display (FWD: xxxx W) reects actual output power reading, which may be lower than regulated power supply when Automatic Gain Control is running in power supply limitation mode (please read section 5.3 about RF power supply modulation for more details).

Note: Output power may be set using the Pwr OFF control. In this condition, the

output power readout (Fwd) on the display will read 0 (zero); the SET bar will reect any adjustments you make using the keys and provides a graphic indication of how

much power supply will be delivered the moment you return to Pwr On state.

5.2.5 Changing the Power Good alarm threshold

Change Forward Power Good alarm setting PgD from the Fnc menu as desired (factory setting is 50%).

5.2.6 Setting equipment I2C address

Change the IIC address in the MIX (Miscellaneous) menu as desired (factory setting is 01).

5.2.7 Adjustments and calibration

The only manual adjustments are the level adjustments and the audio mode adjustment.

The rear panel holds the trimmers for all exciter inputs. Trimmer identication is

printed on the rear panel. Input sensitivity can be set within the limits set out in the tables below through the trimmers:

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Input sensitivity:

Input Figure 6.2 Trimmer Sensitivity Notes

SCA1/

RDS

[13] [16] - 8 ÷ +13 dBu

SCA2 [28] [29] - 8 ÷ +13 dBu

Input level for 7,5 kHz overall deviation (- 20 dB)

MPX [14] [15] -13 ÷ +13 dBu

Left/

Mono

[31] [30] -13 ÷ +13 dBu

Right [18] [17] -13 ÷ +13 dBu

Input level for 75 kHz overall deviation (0 dB)

When setting input sensitivity, please consider that the default menu reports instantaneous modulation level and an indicator provides a 75 kHz reading. To ensure correct adjustment, apply a signal with the same level as user’s audio broadcast maximum level and then adjust using the trimmer until instantaneous deviation matches the 75 kHz reading.

To set subcarrier input levels, you may use the same procedure and option “x10” available in the Fnc menu. With this option, modulation level is multiplied by a factor

of 10, which means that default menu bar meter reects a 7.5 kHz deviation.

A special menu with separate indications of Left and Right channel levels and relating indicators of nominal levels for maximum deviation (75 kHz) is provided.

• Preemphasis:

ON

123

4

50 ms

ON

1

2

3

4

75 ms

• L and R (XLR type) input impedance:

Switch 1: R XLR input impedance, ON = 600 W, OFF = 10 kW

Switch 2: L XLR input impedance, ON = 600 W, OFF = 10 kW

• MPX input operation mode/impedance:

Switch 1: Mode of operation ON = Mono, OFF = Stereo

Switch 2: MPX input impedance, ON = 50

W, OFF = 10 kW

5.3 Operation

NOTE: For better clarity, only the typical screens of TEX702LCD are reported

below. TEX30/50/100/150/300/502LCD screens look the same except that full scale values are different.

1) Power on the exciter and ensure that the ON light turns on. Equipment name

should appear briey on the display, quickly followed by modulation and

forward power readings (Menu 1), provided that the exciter is delivering output power.

ON

1 2

ON

1 2

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Menu 1

1b) To modify power level setting, hold down the ENTER button until opening

the power setup menu.

The edit screen will look like this:

Menu 2

Next to SET indication, a bar provides a graphic display of preset output power.

The lled portion of the bar is proportional to set power level.

Example

100% potenza di uscita Barra piena

≅ 700W in uscita

(mod.TEX702LCD)

≅ 500W in uscita

(mod.TEX502LCD)

≅ 300W in uscita

(mod.TEX300LCD)

≅ 150W in uscita

(mod.TEX150LCD)

≅ 100W in uscita

(mod.TEX100LCD)

≅ 50W in uscita

(mod.TEX50LCD)

≅ 30W in uscita

(mod.TEX30LCD)

25% potenza di uscita 1/4 della barra

≅ 175W in uscita

(mod.TEX702LCD)

≅ 125W in uscita

(mod.TEX502LCD)

≅ 75W in uscita

(mod.TEX300LCD)

≅ 700W in uscita

(mod.TEX702LCD)

≅ 37,5W in uscita

(mod.TEX150LCD)

≅ 25W in uscita

(mod.TEX100LCD)

≅ 12,5W in uscita

(mod.TEX50LCD)

≅ 7,5W in uscita

(mod.TEX30LCD)

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The bottom line provides instantaneous power reading (700W for TEX702LCD shown here), press button

to increase level, press to decrease it. When you have achieved the desired level, press ENTER to conrm and exit the default menu. Please note that the setting is stored automatically; in other words, if you press ESC or do not press any keys before the preset time times out, the latest power level set will be retained.

NOTE: This feature prevents the equipment from delivering maximum power

as soon as output is enabled from menu 4, or in the event the equipment is already set to ON when you energise it.

2) Ensure that the equipment is not in a locked-out state. Press ESC to call up

the selection screen (menu 3). Highlight Fnc and press ENTER to conrm and access the selected menu (menu 4).

If PWR is set to OFF, i.e. power output is disabled, move cursor to PWR. Press

ENTER and label will switch to ON, i.e. power output is enabled.

Press ESC twice to go back to the default menu (menu 1).

3) Fine tune power setting from menu 2 (see description of item 1b) until achieving

the desired value.

WARNING: Equipment is capable of delivering more than rated output power

(30/50/100/150/300/500/700 W for TEX30/50/100/150/300/502/702LCD

respectively); however, never exceed the specied power rating.

NOTE: If power is set to 0 W in the Power Setup Menu, the INTERLOCK OUT

contact is activated and any external appliances connected to it are immediately inhibited.

Next, you can review all operating parameters of the equipment through the

management rmware.

Normally, the equipment can run unattended. Any alarm condition is handled automatically by the safety system or is signalled by the LED indicators on the panel or by display messages.

NOTE: Standard factory settings are output power set to upper limit (unless

otherwise specied by customer) and OFF.

5.4 Management Firmware

The equipment features an LCD with two lines by 16 characters that displays a

set of menus. The gure below provides an overview of equipment menus.

The symbols listed below appear in the left portion of the display as appropriate:

(Cursor) - Highlights selected (i.e. accessible) menu.

(Filled arrow) - Editable parameter marker. This symbol appears in menus that

take up more than two lines to aid browsing.

(Three empty arrows) - Parameter is being edited.

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(Empty arrow) - Current line marker; the parameter in this line cannot be

edited. This symbol appears in menus that take up more than two lines to aid browsing.

Menu 1

Menu 3

Predefined menu

Selection Menu

Menu 2

Power Adjustment Menu

Menu 4

Operation Menu

Menu 5

Power Menu

Menu 6

Power Amplifier Menu

Menu 7

Settings Menu

Menu 8

Miscellaneous Menu

Menu 9

Versions Menu

Menu 10

Channels Menu

Figure 5.2

When the display is off, touching any key will turn on backlighting.

When the display is on, pressing the ESC button from the default menu (menu 1) calls up the selection screen (menu 3), which gives access to all other menus:

Menù 3

If the temperature alarm is enabled and the alarm threshold is exceeded, the following screen will be displayed (only if you are in the default screen):

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As soon as operating conditions are restored, power output is re-enabled with the same settings in use prior to the alarm condition.

Under 20kHz, no modulation occurs. After a preset time of about 5 minutes (not editable), a NO AUDIO condition is indicated in the main screen, but power is not inhibited.

To gain access to a submenu, select menu name (name is highlighted by cursor) using button or and press the ENTER button.

To return to the default menu (menu 1), simply press ESC again.

State 2

5.4.1 Operation Menu (Fnc)

In this menu, you can toggle exciter power output On/Off, set deviation display

mode and the threshold rate for Forward (PgD) or Reected (PgR) Power Good.

To edit an item, highlight the appropriate line using the and then press and hold the ENTER button until the command is accepted. This way, Pwr setting is toggled between On and Off and Mod setting is toggled between “x1” and “x10”. To edit the Power Good rate, simply select item “PgD” or

“PgR” and edit its value using the UP and DOWN buttons; nally, press ENTER to conrm.

and buttons

Pwr Enables (ON) or disables (OFF) exciter power output.

Mod Modies modulation display (toggles between “x1” and “x10”). In “x10”

mode, instantaneous deviation indication is multiplied by a factor of 10,

and the bar meter on the default menu will reect 7.5 kHz instead of

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75 kHz. This display mode is convenient when you wish to display low deviation levels, such as those caused by pilot tone or subcarriers.

PgD Modies Power Good threshold for forward power. The Power Good rate

is a percent of equipment rated power (30/50/100/150/300/500/702 W for TEX30/50/100/150/300/502/702LCD respectevely), not of forward output power. This means that this threshold set at 50% will give 15/25/50/75/150/250/350 W, respectively, regardless of set power level. The Power Good feature enables output power control and reporting. When output power drops below set Power Good threshold, the equipment changes the state of pin [7] of the DB15 “Remote” connector located on the rear panel.

PgR Modies Power Good threshold for reected power. The Power Good

rate is a percent of equipment rated power (3/5/10/15/30/50/70 W for

TEX30/50/100/150/300/502/702LCD respectevely), not of reected

output power. This means that this threshold set at 5% will give 0,15 /0,25/0,50/0,75/1,5/2,5/3,5 W , respectively, regardless of set power level. The Power Good feature enables output power control and alarm management.

NOTE: This alarm does not trip any contacts in the DB15 “Remote” connector and

is only available in systems equipped with telemetry.

5.4.2 Power menu(Pwr)

This screen holds all readings related to equipment output power:

Fwd Forward power reading.

R Reected power reading.

Note that these are readings, rather than settings, and cannot be edited (note the empty triangle). To change power setting, go to the default menu as outlined earlier.

Menu 5

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5.4.3 Power

5.4.4 Setup

Amplier (P.A) Menu

This screen is made up of four lines that can be scrolled using the and

buttons and shows the readings relating to nal power stage:

Menu 6

Note that these are readings, rather than settings, and cannot be edited (note the empty arrow).

VPA Voltage supplied by amplier module.

IPA Current draw of amplier module.

Eff Efciency based on ratio of forward power to amplier module power,

in percent ( FWD PWR/(Vpa x Ipa) % ).

Tmp Equipment internal temperature reading.

Menu (Set)

This menu lets you view and set operating frequency.

Menu 7

F1 Operating frequency setup. Set a new frequency value and then press the

ENTER button to conrm your selection; the exciter unlocks from current

frequency (the LOCK LED turns off) and will lock to the new operating frequency (LOCK turns back on again). If you press ESC or let the preset time time out, the previous frequency setting is retained.

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5.4.5 Miscellaneous Menu (Mix)

This menu lets you set equipment address in an I2C bus serial connection:

Menu 8

IIC

I2C address setting. The I2C network address becomes signicant when the exciter is connected in an RVR transmission system that uses this protocol. Do not change it unless strictly required.

5.4.6 Version Menu (Vrs)

This screen holds equipment version/release information:

Menu 9

Note that these are readings, rather than settings, and cannot be edited (note the empty arrow).

Rel

Firmware release information.

Dat

Release date.

Tab

Shows table loaded in the memory.

5.4.7 Channels Menu (L&R)

Right and left channel input levels are displayed as horizontal bars as shown in

the gure below.

The bar meter reects the level corresponding to a 100% deviation for each channel

and provides a convenient reference when setting audio channel input levels.

Menù 10

L

Left channel Vmeter.

R

Right channel Vmeter..

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5.5 Optional Function

A range of options is available for the product to add certain functions and/or modify existing functions. Outlined below are the functions available at the moment, which

must be specied on order.

5.5.1 FSK Option

The FSK function generates periodic carrier frequency shifts to generate a Morsecoded station ID code.

NOTE: This function is typically used in the USA.

The factory setting for frequency shift is +10KHz and code repetition period is 60 minutes (please contact R.V.R. Elettronica if you need different settings), whereas

station identied may be programmed by the user following the indications provided

in section below.

When the FSK option is tted, an FSK submenu is added to the selection menu.

Menu 11

Press the ENTER key when FSK is highlighted in the selection menu to access the FSK submenu:

Menu 12

FSK

Enables / disables FSK code transmission.

Cod

Shows the Morse code sent normally.

5.5.1.1 Changing the ID code

User may change the FSK code used as a station identier at any time.

This procedure requires:

• 1 RS232 male-female cable;

• Hyper Terminal interface (make sure it has been installed together with Windows®) or equivalent serial communication software.

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A brief description of the procedure is provided below:

• Connect the PC serial port COM to the SERVICE connector on the rear panel of TEX30/50/100/150/300/502/702LCD using a standard Male DB9 - Female DB9 serial cable.

• Power on the exciter;

• Launch the serial communication software;

• Set communication parameters as follows:

Baud Rate: 19200 Data Bit: 8 Parity: None Stop Bit: 1 Flow control: None;

• Activate Caps-Lock through the communication software and send string CODE followed by the 6-character station ID code followed by Enter.

NOTE: To be treated as valid, the code must be made up of 6 alphanumeric

characters and must contain no blank spaces; if acknowledged as valid, code is echoed back to the terminal, illegal codes are not echoed.

5.5.2 Power UP/DOWN Option

The Power UP/DOWN option modies the signal receive function for the signals

present at the telemetry connector.

RF section on / off control signals are treated as control signals for RF output power level to allow for UP/DOWN setting.

The UP or DOWN command is provided by switching the corresponding signal at the connector to ground for at least 500mS (pin features internal pull-up to power supply).

Conguration of DB15F telemetry connector (Remote):

Pin Standard Function UP/DOWN Power Function

14 On cmd Up cmd Enables the RF power supply Increases the RF power supply 15 Off cmd Down cmd Disables the RF power supply Reduces the RF power supply

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of the Modules

The TEX30/50/100/150/300/502/702LCD is made up of various modules linked to each other through connectors so as to make maintenance and any required module replacement easier.

Upper view

The gure below shows the equipment upper view with the various components

pointed out.

[1] Main Board & Stereo Coder Card (SLMBDTEXLC07 & SLCTC30V03) [2] Panel Card (SL007PC3001) [3] Telemetry Card (SLTLMTXLCD03) [4] Control Card& Power Amplier (SL037BI1004 & SLPA30WMOS02) [5] Power Supply (FLY100SMD)

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gure 8.1

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6.1.2 TEX50/100/150LCD Upper view

The gure below shows the equipment upper view with the various components

pointed out.

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gure 8.2

[1] Main Board & Stereo Coder Card (SLMBDTEXLC07 & SLCTC30V03) [2] Panel Card (SL007PC3001) [3] Telemetry Card (SLTLMTXLCD03) [4] Control Card& Power Amplier (SL045DR1003 & SLPA150WMOS) [5] Power Supply (PSL300)

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6.1.3 TEX300LCD Upper view

The gure below shows the equipment upper view with the various components

pointed out.

gure 8.3

[1] Main Board & Stereo Coder Card (SLMBDTEXLC07 & SLCTC30V03) [2] Panel Card (SL007PC3001) [3] Telemetry Card (SLTLMTXLCD03) [4] Control Card& Power Amplier (SL045DR1003 & SL045RF1002) [5] Power Supply (PSL600)

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6.1.4 TEX502/702LCD Upper view

The gure below shows the equipment upper view with the various components

pointed out.

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gure 8.4

[1] Main Board & Stereo Coder Card (SLMBDTEXLC07 & SLCTC30V03) [2] Driver Card (SL175DR1002) [3] Panel Card (SL007PC3001) [4] Telemetry Card (SLTLMTXLCD03) [5] Bias Card, Control Card, Low Pass Filter Card & Power Amplier - TEX502LCD model (SL046BI1001, SL175BI1001, SL175LP1002 & SL154RF3001)  Bias Card, Cintrol Card, Low Pass Filter Card & Power Amplier - TEX702LCD model (SL046BI1001, SL175BI1001, SL175LP1002 & SL154RF2002) [6] Power Supply (PSL5021)

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7.1 TEX30/50/100/150/300/502/702LCD Common Parts

board

The panel board contains the microcontroller (PIC18F452) that implements the equipment control software, the display and the other components needed to interface with the user.

The board is connected with the other machine modules, both for power supply distribution and for the control and measures.

board

The main board carries out the following functions:

• Audio and SCA input treatment

• Generation of carrier frequency

• Modulation

• R.F. amplication (Driver)

The board also features a stereophonic coder.

input section

The audio input section contains the circuits that perform the following functions:

• Input impedance selection

• 15 kHz ltering of the left and right channel

• Stereophonic Coding

• Mono channel preemphasis

• Mono, MPX and SCA channel mixing

• Clipper (limits the modulating signal level so that the frequency deviation does

not exceed 75 kHz)

• Modulating signal measurement

section

This board section generates the modulated radiofrequency signal. It is based on a PLL scheme that uses an integrated MB15E06 type.

section

SBFM100SS Transmitter User Manual

Before passing to the nal power amplier, the RF signal is preamplied in this

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section by an ERA3 transistor. When the exciter is placed on stand-by, the driver is by-passed.

7.1.3 Telemetry board

This board is designed to inform the user of the equipment operation state. All input and output signals are available on the DB15 connector.

The same board also features the “INTERLOCK” BNC connector for disabling the device. By grounding the central pin, the output power is reduced to zero until the connection is removed.

When an R.V.R. amplier is used, this connector is linked to the power amplier REMOTE or INTERLOCK by means of a BNC-BNC connection. In case of amplier

faults, the central conductor is grounded thus forcing the machine to enter in stand-by mode.

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7.2 TEX30LCD Different Parts

7.2.1 Power Supply

The TEX30LCD power supply unit is a switching-type unit whose +28 V main output

powers the machineÌs RF amplier. The power supply also features stabilizers for

generating continuous +5 V and +18 V voltages for supplying the other equipment circuits. Note that the power supply is a “direct from mains” type, or rather it is without a transformer, and it can be connected to any voltage between 80 and 260 V without any adjustments or manual settings. The power supply unit is also connected to

24 V auxiliary continuous voltage inputs used to automatically buffer

the mains power cutoff.

 7.2.2 Power Amplier

The nal power stage is enclosed in a totally shielded metal container fastened

in the centre of the device.

The RF signal coming from the “main” card reaches the pilot, is amplied and is then sent to the nal stage that sees to its nal amplications up to 30W.

The amplier is made in three stages. The rst is made with one BFG35, the

secondwith three BFG35 in parallel, and the last with one BLF245.

In addition to the actual RF amplication, this circuit carries out the following

functions:

• Control of the power level in output, depending on the setting

• Reduction of the power supplied when in presence of high-level reected

power

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• Measures of the forward and reflected power by means of directional couplers

• Measures of the current absorbed by the power amplier

• Measures of the temperature

• Low-pass ltering of the RF signal in output

This board also features an RF sampling of approximately -30dB RF with respect to the output, which is available on a BNC connector below the transmitter output connector. This sample is is useful for verifying the characteristics of the carrier, but not for verifying those of the upper harmonics.

7.2.3 Control Board

The main function of this board is to check and correct the MOSFET polarization

voltage of the RF amplier section.

It also provides the measurement of the absorbed current and contains a circuit for signaling power supply unit faults.

If no alarms are present, the voltage is adjusted only depending on the set output power, with a feedback mechanism based on the reading of the power really delivered (AGC).

The voltage is also affected by other factors, such as:

• Excess of reected power.

• External AGC signals (Ext. AGC FWD, Ext. AGC RFL).

• Excess of temperature.

• Excess of absorbed current from the RF module.

7.3 TEX50/100/150LCD Different Parts

7.3.1 Power Supply

The TEX50/100/150LCD power supply unit is a switching-type unit whose +28 V

main output powers the machineÌs RF amplier. The power supply also features

stabilizers for generating continuous +5 V, -15V, +8V, +18 V and -18 V voltages for powering the other device circuits. The power supply unit is also connected to 24 V auxiliary continuous voltage inputs used to automatically buffer the mains power cutoff.

7.3.2 Power Amplier

The nal power stage is enclosed in a totally shielded metal container fastened

in the centre of the device.

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The RF signal coming from the “main” card reaches the pilot, is amplied and is then sent to the nal stage that sees to its nal amplications up to 150W.

The amplier is made in two stages. The rst is made with BLF244 and the last

with BLF147.

In addition to the actual RF amplication, this circuit carries out the following

functions:

• Control of the power level in output, depending on the setting

• Reduction of the power supplied when in presence of high-level reected

power

• Measures of the forward and reflected power by means of directional couplers

• Measures of the current absorbed by the power amplier

• Measures of the temperature

• Low-pass ltering of the RF signal in output

On this card is an RF sample approximately -30dB compared with the output that is available on a BNC connector underneath the output connector of the transmitter. This sample is useful for checking the characteristics of the carrier, but not of the higher order harmonics.

7.3.3 Control Board

The main function of this board is to check and correct the MOSFET polarization

voltage of the RF amplier section.

It also provides the measurement of the absorbed current and contains a circuit for signaling power supply unit faults.

If no alarms are present, the voltage is adjusted only depending on the set output power, with a feedback mechanism based on the reading of the power really delivered (AGC).

The voltage is also affected by other factors, such as:

• Excess of reected power.

• External AGC signals (Ext. AGC FWD, Ext. AGC RFL).

• Excess of temperature.

• Excess of absorbed current from the RF module.

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7.4 TEX300LCD Different Parts

7.4.1 Power Supply

The TEX300LCD power supply unit is a switching-type unit whose +50 V main stabilizers for generating continuous +5 V, +18 V and -18 V voltages for supplying the other equipment circuits. Note that the power supply is a “direct from mains” type, or rather it is without a transformer, and it can be connected to any voltage between 90 and 260 V without any adjustments or manual settings.

7.4.2 Power Amplier

The nal power stage is enclosed in a totally shielded metal container fastened

in the centre of the device.

The RF signal coming from the “main” card reaches the pilot, is amplied and is then sent to the nal stage that sees to its nal amplications up to 300W.

The amplier is made in three stages. The rst is made with BFG35, the second

with one BLF175 and the last with one SD2942.

In addition to the actual RF amplication, this circuit carries out the following

functions:

• Control of the power level in output, depending on the setting

• Reduction of the power supplied when in presence of high-level reected

power

• Measures of the forward and reflected power by means of directional couplers

• Measures of the current absorbed by the

power amplier

• Measures of the temperature

• Low-pass ltering of the RF signal in output

This board also features an RF sampling of approximately -60dB RF with respect to the output, which is available on a BNC connector below the transmitter output connector. This sample is is useful for verifying the characteristics of the carrier, but not for verifying those of the upper harmonics.

7.4.3 Control Board

The main function of this board is to check and correct the MOSFET polarization

voltage of the RF amplier section.

It also provides the measurement of the absorbed current and contains a circuit for signaling power supply unit faults.

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ELETTRONICA

power, with a feedback mechanism based on the reading of the power really

delivered (AGC).

The voltage is also affected by other factors, such as:

• Excess of reected power.

• External AGC signals (Ext. AGC FWD, Ext. AGC RFL).

• Excess of temperature.

• Excess of absorbed current from the RF module.

7.5 TEX502/702LCD Different Parts

7.5.1 Power Supply

The TEX502LCD power supply unit is a switching-type unit whose +50 V main stabilizers for generating continuous +5 V, +18 V and -18 V voltages for supplying the other equipment circuits. Note that the power supply is a “direct from mains” type, or rather it is without a transformer, and it can be connected to any voltage between 90 and 260 V without any adjustments or manual settings.

7.5.2 Power Amplier

The nal power stage is enclosed in a totally shielded metal container fastened

in the centre of the device.

The RF signal coming from the “main” card reaches the pilot, is amplied and is then sent to the nal stage that sees to its nal amplications up to 500W (for

TEX502LCD model) or up to 700W (for TEX702LCD model).

The amplication stage consists of two main blocks.

In addition to the actual RF amplication, this circuit carries out the following

functions:

• Control of the power level in output, depending on the setting

• Reduction of

power

• Measures of the current absorbed by the power amplier

• Measures of the temperature

the power supplied when in presence of high-level reected

This board also features an RF sampling of approximately -60dB RF with respect to the output, which is available on a BNC connector below the transmitter output connector. This sample is is useful for verifying the characteristics of the carrier, but not for verifying those of the upper harmonics.

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The driver card is able to The card and drivers’ capable of delivering approximately 15W of power.

The driver stage is made in two stages. The rst is made with one BFG35 and the

last with one LD-MOS PD57006.

Stage block

The nal stage is made of two MOS-FET SD2932 (for

TEX502LCD model) or two

MOS-FET SD2942 (for TEX702LCD model).

Board

The main function of this board is to check and correct the MOSFET polarization

voltage of the RF amplier section.

It also provides the measurement of the absorbed current and contains a circuit for signaling power supply unit faults.

If no alarms are present, the voltage is adjusted only depending on the set output power, with a feedback mechanism based on the reading of the power really delivered (AGC).

The voltage is also affected by other factors, such as:

• Excess of reected power.

• External AGC signals (Ext. AGC FWD, Ext. AGC RFL).

• Excess of temperature.

• Excess of absorbed current from the RF module.

Pass Filter Card

This card provide the low-pass ltering of the RF signal in output and measure the reected and forward power output.

Card

This card controls the bias voltage and contains AGC networks for forward power,

reected power, temperature, current and EXT AGC.

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Tel: 972-473-2577 | Email: [email protected]

18208 Preston Rd. Suite D9-297, Dallas, TX 75252. www.sbp-tv.com

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Jimmie Joynt