R.V.R. Elettronica SDC100 User manual

Manufactured by Italy
SDC100
User Manual

SDC100-UserManual
Version 3.0
© Copyright 1993-2001
R.V.R.ElettronicaSpA
Via del Fonditore 2/2c - 40138 - Bologna (Italia)
Telefono: [phone]
Fax: [phone]
Email: [e-mail]
Web: www.rvr.it
Allrightsreserved
PrintedandboundinItaly.Nopartofthis manualmaybe reproduced,
memorized or transmitted in any form or by any means, eletronic or
mechanic, including photocopying, recording or by any information
storageandretrievalsystem,without the permission of the copyright
owner.

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Table of Contents
1. Preliminary Instructions 1
2. Warranty 3
3. First Aid 5
3.1 Treating electric shocks 5
3.2 Treating electric burns 6
4. General Description 7
5. Quick Start 9
5.1 Preparation 9
5.2 Installation 10
6 External Description 11
6.1 Front Panel 11
6.2 Rear Panel 12
6.3 Connectors Description 13
7. Technical Specifications 15
7.1 Mechanical Specifications 15
7.2 Electrical Specifications 15
8. Identification and Access to the Modules 17
8.1 Modules Identification 17
8.2 Theory of Operation 18
8.3 Mother Board 19
8.4 Power Supply Card 20
8.5 Panel Card 20
8.6 Stereo Coder Card 20
8.7 R.D.S. Card (optional) 20
9. Software Description 23
9.1 Software Installation (only with R.D.S. option) 23
Appendix
Component layouts, schematics, bills of material

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1. Preliminary Instructions
This manual is designed to provide a general guide to skilled and qualified
personnel, who are aware of the dangers that may arise when handling electric
and electronic circuits.
It does not aim to provide a complete description of all the safety precautions that
must be observed by people who use this or similar equipment.
Theinstallation, operation, maintenanceand use ofthispiece ofequipmentinvolve
risks both for people and the equipment itself, which must be handled only by
experienced technicians.
R.V.R. Elettronica SpA does not assume responsibility for injuries to persons or
damage to items caused by improper use or incorrect usage procedures, whether
the users are experienced or not.
Users should observe local regulations and fire-prevention rules while installing
and using this equipment.
WARNING: always disconnect the power before opening covers or removing any
part of the equipment.
Takeappropriateearthing measurestodischarge the condensersandhigh voltage
points before doing any maintenance work.
WARNING: this equipment may radiate radio-frequency energy, and if it is not
installed according to the instructions, may cause troublesome interference to
radio communications.
Operating this equipment in a residential environment may give rise to radio
disturbance; if so, the user may be asked to take appropriate counter measures.
R.V.R. Elettronica SpA reserves the right to make modifications to the design
and technical specifications of the equipment, and to update this manual without
notice.

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2. Warranty
The guarantee, which is for 12 (twelve) months, is valid for any R.V.R. Elettronica
product.
On components such as tubes for final amplifiers, the manufacturer’s guarantee
applies.
R.V.R. Elettronica extends all transferable original guarantees to its own products.
To ensure that servicing is carried out properly and as fast as possible, the work
shallbehandled by R.V.R. Elettronica; any claimsshouldbe sent directly toR.V.R.
Elettronica, in accordance with the defined procedures.
The warranty does not include:
1 damage while the equipment is being shipped to R.V.R. for repairs;
2 any unauthorized modification or repair;
3 accidental damage, or damage not due to defects in the equipment;
4 nominal damage not accidental;
5 shipping the equipment and insuring it, and replacement of parts or units.
Any damage to the equipment caused during shipment must be reported to the
transporters and notified in writing on the forwarding receipt.
Any difference or damage discovered after delivery must be reported to R.V.R.
Elettronica within 5 (five) days from the delivery date.
To take advantage of the guarantee, adopt the following procedure:
1 Contact the retailer or dealer where you bought the equipment; describe the
problem or fault to check if there is a simple solution.
Retailers and Distributors can provide full information on the problems that
occur most frequently; they can normally repair the equipment much faster
than the manufacturer
2 If your dealer cannot help you, contact R.V.R. Elettronica and describe the
problemtothem; if necessary,you will besentauthorization with the necessary
instructions;
3 When you have received authorisation, return the equipment carriage paid to
the address specified.
Pack it carefully, if possible in the original packing, and seal the package.
Donotreturn the machinewithoutprior authorization, otherwise itmaybe returned
to you
4 Quote the machine’s type, model and serial number; attach a written technical
diagnosis listing all the problems and faults encountered, and enclose a copy
of the invoice.

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Replacement of parts under guarantee or spare parts can be ordered from the
following address:
R.V.R. Elettronica SpA
Via del Fonditore, 2/2c
40138 BOLOGNA
ITALY
Tel. [phone]
quoting type, model and serial number of the device.

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3. First Aid
Personnel involved in the installation, use, and maintenance of the equipment
must be familiar with the theory and practice of first aid.
3.1 Treating electric shocks
3.1.1 If the victim is inconscious
Follow the first aid principles described below.
• Lay the victim down on his back on a rigid surface
• Free the respiratory tracts by raising the neck and pushing the forehead back
(Figure 1).
• If necessary, check the breathing of the victim opening his mouth.
• If the victim is not breathing, start artificial respiration immediately (Figure 2):
incline the head, close the nostrils, apply your mouth to the victim’s and make
four fast respirations.
Figure 1 Figure 2
• Check the heart beat (Figure 3); if there is none, start a cardiac massage
immediately (Figure 4) pressing the sternum approximately at the centre of the
chest (Figure 5).
Figure 3 Figure 4 Figure 5
• If there is just one person providing first aid, he must adopt a rhythm of 15
compressions and 2 fast respirations alternately.
• If there are two persons, the rhythm must be 1 respiration and 5 compressions
alternately

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• Do not interrupt the cardiac massage during the artificial respiration.
• Call a doctor as soon as possible
3.1.2 If the victim is conscious
•Cover the victim with a blanket
•Keep him calm.
•Loosen the victim’s clothes and keep him lying down
•Call a doctor as soon as possible
3.2 Treating electric burns
3.2.1 Large-scale burns and serious cuts
•Cover the area concerned with a sheet or a clean cloth.
•Do not break the blisters; remove any fabric and parts of clothing that may be
attached to the skin; apply a suitable ointment.
•Treat the victim depending on the type of accident.
•Take the victim to hospital as soon as possible.
•If the arms and legs are injured, keep them raised.
If no medical help is available within an hour and the victim is conscious and has
not retched, administer a liquid solution of salt and bicarbonate of soda: 1
teaspoonful of salt to every 250ml of water.
Get the victim to slowly drink half a glass of the solution, four times, over a period
of 15 minutes.
Stop the treatment if the victim starts to retch.
Do not administer alcoholics!
3.2.2 Less serious burns
•Apply cold gauze compresses (not iced) using a clean cloth (i.e. as clean as
possible).
•Do not break any blisters; remove any fabric and parts of clothing that may be
attached to the skin; apply a suitable ointment.
•If necessary, dress the victim in clean dry clothes.
•Treat the victim depending on the type of accident.
•Take the victim to hospital as soon as possible.
•If the arms and legs are injured, keep them raised.

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4. General Description
The SDC100 is a stereo digital coder. It is engineered for high performance stereo
FM broadcasting, and it’s contained in a 19” rack mountable 1HE case.
This device integrates in a cheap model, without quality compromises, all the
technical characteristics of more expensive coders.
Moreover, there isacommandssectionwith relative led indicators composed of: a
preenphasis command switch, a left channel switch, a command to put in phase
left and right channels, a right channel switch, and a 19 KHz tone selector.
On the rear panel there are: the voltage changer and the mains voltage socket,
the plugs for 24Vdc external supply, a 19KHz pilot tone output connector with its
phase regulator, a MPX1 output connector with its level selector, a MPX2 output
connectorwith its levelselectora SCA2/RDSinputconnector withitslevelselector,
a SCA1 input connector with its level selector, a LEFT input connector with its
level selector and a RIGHT input connector with its level selector.
ThisStereoCoder uses afrequencysinthesized internal digitalcircuitrythat allows
very linear modulation, high stereo separation, high input level capability.
Theinput/outputanalogsectionof goodqualityintegratesoneselfwith digitalsystem
answering for high input dynamics, high signal/noise rate and very low distorsion.
The SDC100 is designed in a modular way: the different functionalities are
performed by modules that are then interconnected either directly (the male
connector of one module plugs in the the female connector of another one) or by
means of connectors-ended cables. This design allows easy servicing and
replacement of the single modules.

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5. Quick Start
Thischapter givesa conciseview ofthe pointsthat arenecessaryfortheinstallation
of the device. If any item is not completely clear, for example when you use the
exciter for the first time, we strongly suggest to read throughly the manual.
5.1 Preparation
Unpack the coder and before any other operation check the unit for any shipping
damageand check thatallthe controlsandconnectors on thefront and rearpanels
are in good conditions.
Checkthemains voltage selector ontherear panel: the selectedvalueisindicated
by an arrow. If required, extract the selector block levering with a little screwdriver.
Rotate the block until the correct printed value corresponds with the arrow, then
reinsert it.
Thevoltageselectorblockalsocontainsthelinefuse.Thekindoftheadapter fuse
is:
A.C. LINE FUSE 1A 5X20
Verify that SDC100 coder is switch off.
Connect the output connector of the mixer or of the last receiver to “Right” and
“Left”inputconnector.The SDC100isbalanced andcanbe of “XLR”typeor socket
type.
Respect the XLR connectors pins position showed in the chapter 6. SDC100 has
SCA and RDS inputs; the technical caracteristics of these inputs are mentioned in
chapter 7.
NOTE: It’s important don’t connect any audio signals not codified because will be
mixed with MPX signal on the MPX output.
Connect the mains cable to the plug on the rear of the coder.
NOTE: This device shall be correctly connected to ground.
Correctgrounding is essentialbothfor safety andtoreach the ratedperformances.

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5.2 Installation
The SDC100 coder is factory-adjusted to obtain the maximum stereo separation
using professional instrumentation. This setting is normally the best one for most
FM stations.
However, possible FM transmitter phase delays can be compensated adjusting
the pilot tone phase, to obtain the maximum stereo separation performance for
each transmitting system.
NOTE: Please note that this kind of operations should only be done by skilled
technical people. Remember that this operation is not normally needed. Opening
the device may void you’re warranty.
To obtain a precise adjustment, it’s necessary to use a professional measurement
stereo decoder.
If such a stereo decoder is not available, an approximative adjustment can be
executed in the following way:
•Put into “Left” and “Right” inputs of the coder a 1KHz sinusoidal signal.
•Switch off the preenphasis command.
•Adjust input level to read on the led meter a signal of 0 dBm (yellow LED).
•Adjust output level for a level that entails a deviation of 75KHz (100%) on the
transmitter meter.
•Connect an oscilloscope to low frequency output of the left channel of a good
quality tuner.
•Switch off the left channel on the coder and adjust the pilot phase on the stereo
coder card (C19) to obtain on the oscilloscope the minimum signal residual.
•Now,connecttheoscilloscopeonlowfrequencyoutputofthetunerrightchannel
and diconnect coder right channel inserting again left channel.
•Adjust again the phase to obtain a minimum residual of signal.
•Repeattothe bitter endtheoperations the last 4pointsuntil to obtain maximum
symmetrical separation.
Now the coder is perfectly interfaced to your FM transmitting system.
NOTE: Even if the tuner used for the adjustments can be of good quality, the
stereo separation of commercial equipment cannot normally be as good as the
ones of professional transmitting systems. For this reason, the results measured
withthisprocedure will not quantitatively reflectthecharacteristics of the SDC100.

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6 External Description
This chapter describes the elements of the front and rear panels of the SDC100.
6.1 Front Panel
figure 6.1
[1] LEVEL METER “Left” and “Right” channels LED bar meters
[2] METER SELECTOR Selector for meter (SCA/MPX or LEFT/RIGHT)
[3] PREEMPHASIS Pre-emphasis ON/OFF selector
[4] L Left channel ON/OFF selector
[5] L=R / L=-R Channel phase selector
[6] R Right channel ON/OFF selector
[7] 19 KHz 19 KHz pilot tone selector
[8] TA TA selector - (used only with RDS card)
[9] POWER ON/OFF power switch
[10] METER SELECTOR LED LED ON - SCA/MPX meter selector
LED OFF - LEFT/RIGHT meter selector
[11] ON LED Power ON LED
[12] PRE-EMPHASIS LED Pre-emphasis ON/OFF LED indicator
[13] L CHANNEL LED Left channel ON/OFF led indicator
[14] L=R LED Channels phase LED indicator
[15] R CHANNEL LED Right channel ON/OFF LED indicator
[16] 19 KHz LED 19 KHz tone LED indicator
[17] TA LED TA LED - (used only with RDS card)
[18] TP LED TP LED - (used only with RDS card)

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6.2 Rear Panel
figure 6.2
[1] VOLTAGE CHANGER & Fuse block and line voltage selector. Use a small screwdriver to
A.C. LINE FUSE change the fuse or line voltage. Rotate the block and position it
for the desired voltage.
[2] MAINS VOLTAGE A.C. power line socket
[3] 24VDC Plug for the external 24Vdc supply
[4] RS-232C DB9 connector for direct or modem serial communication
(only with RDS card)
[5] TELEMETRY Telemetry DB9 connector of optiona board (only with RDS card)
[6] R.D.S. LEVEL ADJ Trimmer for phase adjustments (only with RDS card)
[7] R.D.S.OUTPUT RDS output connector, BNC type
[8] PHASE ADJ Trimmer for phase adjustments (not present)
[9] 19KHz OUTPUT 19KHz output connector, BNC type
[10] MPX1 OUT LEVEL ADJ Trimmer for MPX1 output level adjustment
[11] MPX1 OUTPUT MPX1 output connector, BNC type
[12] MPX2 OUT LEVEL ADJ Trimmer for MPX2 output level adjustment
[13] MPX2 OUTPUT MPX2 output connector, BNC type
[14] SCA/RDS LEVEL ADJ Trimmer for SCA2/RDS input level adjustment
[15] SCA2/RDS INPUT SCA2/RDS input connector, BNC type
[16] SCA1 LEVEL ADJ Trimmer for SCA1 input level adjustment
[17] SCA1 INPUT SCA1 input connector, BNC type
[18] LEFT LEVEL ADJ Trimmer for left input level adjustment
[19] LEFT INPUT Left input connector, XLR female type
[20] RIGHT LEVEL ADJ Trimmer for right input level adjustment
[21] RIGHT INPUT Right input connector, XLR female type

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6.3 Connectors Description
6.3.1 RS 232 (only with RDS card)
Tipo: DB9 female
1NC
2 TX_D
3 RX_D
4NC
5 GND
6 +12V
7NC
8 CTS
9NC
Note: Normally, the SDC100 is configured as DCE (Data Communication
Equipment) for serial communication.
6.3.2 Telemetry (only with RDS card)
Type: DB9 female
1 Reserved for future use
2 Reserved for future use
3 Reserved for future use
4 Reserved for future use
5 Reserved for future use
6 Reserved for future use
7 Reserved for future use
8 Reserved for future use
9 Reserved for future use
6.3.3 Left (MONO) / Right (MPX Bal)
Type: XLR female
1 GND
2 Inphase (+)
3 Return (-)
21
3
16
16

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7. Technical Specifications
7.1 Mechanical Specifications
Panel size 483 mm (19”) x 44 mm (1.7”) (1 HE)
Depth 242 mm (9.5”)
Weight 4 Kg
Temperature range -10 °C ÷ +50 °C
7.2 Electrical Specifications
General
A.C. SUPPLY 100-130 V, 50-60 Hz
198-250 V, 50-60 Hz
D.C. SUPPLY 24V
Audio Input (L & R)
Input level Adjustable from -12 to +15 dBm
Input sensivity 194mVrms (-12dBm)
Input impedance 50 Ohm / 600 Ohm / 10KOhm
(internally selectable)
Input connector XLR type, female
Frequency responce < ±0.3dBm from 20KHz to 15KHz
CMRR > 60 dB
19KHz suppression > -50dB
38KHz suppression > -80dB
Pre-emphasis OFF / 25µS / 50µS / 75µS
(internally selectable)
SCA Input
Input level Adj. from 0 to +15dBm for -20dB output
Input impedance > 10KOhm (unbalanced)
Input connector BNC type
Frequency response < ±0.2dB from 50KHz to 100KHz
RDS Input
Input level Adj. from 0 to +15dBm for -20dB output
Input impedance > 10KOhm (unbalanced)
Input connector BNC type
Frequency response < ±0.2dB from 50KHz to 100KHz
Stereo Generator
Pilot tone frequency 19 KHz ±0.1
Pilot tone level -20dB (internally adjustable)
Pilot tone output connector BNC type, 1Vpp
MPX output 2, completly indipendent
MPX output connector BNC type
Output 1 impedance (multiplex) 50 Ohm (unbalanced)
Output 1 level (multiplex) adjustable from -10 to +10 dBm
Output 2 impedance (multiplex) 50 Ohm (unbalanced)
Output 2 level (multiplex) adjustable from -10 to +10 dBm

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Separation (50 Ohm output load) 45dB from 30Hz to 400Hz
55dB from 400Hz to 5KHz
65dB from 5KHz to 10KHz
60dB from 10KHz to 15KHz
Separation (600 Ohm output load) 50dB from 30Hz to 400Hz
60dB from 400Hz to 10KHz
57dB from 10KHz to 15KHz
Separation (10KOhm output load) 70dB from 30Hz to 5KHz
60dB from 5KHz to 10KHz
56dB from 10KHz to 15KHz
Subcarrier suppression (38KHz) > 70 dB
THD (1KHz, output = +12 dBm) < 0.03%
Signal / Noise ratio -80 dB (DIN AUDIO), decoded, de-
emphasized left and right RMS
Power requirements 100-130Vac, 50-60Hz
198-250Vac, 50-60Hz
DC power requirements 24V, 500mA max
RDS Output (only with RDS card)
RDS Signal as in CENELEC EN 50067 specs
Codification Differential at two levels
Modulation DSB with suppressed carrier
Frequency 57 Khz
Range ±2.4 Khz
RDS output level 20-1000 mVpp
Output impedance 100 Ohm
RDS user messages 16 words of 8 characters, whose 2 with data
and transmission time
Alternative frequencies 25
Message change with IBM-compatible PC
Data preservation 10 years (in absence of power supply)
Connection RS232-C standard
Comunication Full Duplex
Velocity 1200 baud
RS232-C connector 9 Pin Cannon Female
Message management checked with a microchecker
Telemetry connector 9 Pin Cannon Female