MAINTENANCE AND OPERATION
INSTRUCTION MANUAL
06/20/11/15/10
SmartGen 4
RDS / RBDS Encoder
with USB & RS-232 Connectivity
UECP Compatible
Contents
Introduction ........................................................................................................................................ 6
General Information .......................................................................................................................... 7
Product Features ................................................................................................................................ 7
Technical Specications .................................................................................................................. 8
Block Diagram ................................................................................................................................ 9
Front Panel.................................................................................................................................... 10
Rear Panel ..................................................................................................................................... 11
RDS: Europe vs America ................................................................................................................ 12
The RDS System .............................................................................................................................. 12
Addressing The SmartGen 4 .......................................................................................................... 13
RDS Applications Supported ......................................................................................................... 14
AF ................................................................................................................................................. 14
DI .................................................................................................................................................. 14
FFG .............................................................................................................................................. 14
M/S ............................................................................................................................................... 14
PI .................................................................................................................................................. 14
PS ................................................................................................................................................. 15
PTY ............................................................................................................................................... 15
RT ................................................................................................................................................. 15
TA .................................................................................................................................................. 15
TP ................................................................................................................................................. 15
Before you start ................................................................................................................................ 16
Safety warning ............................................................................................................................... 16
Operating Recommendations ....................................................................................................... 17
Unpacking and Inspection ............................................................................................................... 18
Mounting .......................................................................................................................................... 18
Rack Requirement ......................................................................................................................... 18
Heat Dissipation ........................................................................................................................... 18
AC (MAINS) Power ......................................................................................................................... 18
Fuseholder .................................................................................................................................... 18
Mains Voltage Selector ................................................................................................................. 18
Power Cord .................................................................................................................................. 19
Ground Loops ............................................................................................................................... 19
Selection of Operating Modes ........................................................................................................ 20
Sidechain Mode ............................................................................................................................ 20
Loop-Through Mode ..................................................................................................................... 20
Connecting The SmartGen 4 ........................................................................................................... 21
Important Connection Considerations! ........................................................................................ 21
Sidechain Mode (preferred) ......................................................................................................... 22
Loop-Through Mode ..................................................................................................................... 23
Manually Activating the TA Flag ................................................................................................. 24
Data Interconnection ....................................................................................................................... 25
The SmartGen 4 may be addressed two ways: ............................................................................. 25
Computer or Terminal Requirements ........................................................................................... 25
Modem Link .................................................................................................................................. 26
Subcarrier Injection Level ............................................................................................................. 27
Setting Subcarrier Amplitude ....................................................................................................... 27
Subcarrier Phase .......................................................................................................................... 28
Programming Options .................................................................................................................... 29
Advanced Programming for Station Automation ......................................................................... 29
Simplied Windows® Data-Entry Software .................................................................................. 29
Loading and Running The Simplied Software ............................................................................ 30
Installing the Software .................................................................................................................. 30
Installing The USB Port Driver ..................................................................................................... 31
Serial (COM Port) Encoder Communications ............................................................................. 35
The Data-Entry Screen ................................................................................................................... 36
Some Notes on Dynamic Messaging ............................................................................................ 36
RDS vs. RBDS Mode .................................................................................................................... 36
Using ALL-CAPS .......................................................................................................................... 36
PI Code Calculator ...................................................................................................................... 37
PI .................................................................................................................................................. 38
PTY ............................................................................................................................................... 38
PS ................................................................................................................................................. 38
PARSE ........................................................................................................................................... 39
Parsing Dened ............................................................................................................................ 39
“Safe Scrolling” Explained .......................................................................................................... 39
DPSS ............................................................................................................................................ 40
DRTS ............................................................................................................................................ 40
MS ................................................................................................................................................ 41
TA .................................................................................................................................................. 41
TP ................................................................................................................................................. 41
DI .................................................................................................................................................. 41
DPS .............................................................................................................................................. 42
TEXT ............................................................................................................................................. 43
SPEED .......................................................................................................................................... 43
ECHO ........................................................................................................................................... 43
AF1 through AF9 .......................................................................................................................... 43
Sending Data to the Encoder ....................................................................................................... 44
Reading Data From the Encoder ................................................................................................. 44
File Management ......................................................................................................................... 44
Programming Port Priorities ......................................................................................................... 45
Hardware Conguration ................................................................................................................ 46
Serial COM Port Conguration ................................................................................................... 47
Power-Up ..................................................................................................................................... 49
Echo .............................................................................................................................................. 50
Programming Syntax ...................................................................................................................... 51
How to Type .................................................................................................................................. 51
Using ALL-CAPS .......................................................................................................................... 51
Correcting Mistakes ..................................................................................................................... 51
Validity Symbols ........................................................................................................................... 52
Encoder Housekeeping Commands ............................................................................................... 53
Register Interrogation .................................................................................................................. 53
Encoder Initialization ................................................................................................................... 53
Saving Entries .............................................................................................................................. 53
Encoder Reset ............................................................................................................................... 53
Firmware Version ......................................................................................................................... 53
Static Data Programming ............................................................................................................... 54
PI Calculation .............................................................................................................................. 54
PS ................................................................................................................................................. 55
PTY ............................................................................................................................................... 56
TP ................................................................................................................................................. 57
TA .................................................................................................................................................. 57
TA Timeout .................................................................................................................................... 57
AF ................................................................................................................................................. 58
DI .................................................................................................................................................. 59
M/S ............................................................................................................................................... 59
RT ................................................................................................................................................. 59
RadioText Rate ............................................................................................................................. 59
Free Format Group ...................................................................................................................... 60
Saving Entries .............................................................................................................................. 60
Scrolling Display And Dynamic Encoder Operation ................................................................... 61
Safety Considerations ................................................................................................................... 61
RadioText ...................................................................................................................................... 61
Dynamic PS .................................................................................................................................. 61
‘Block’ Transmission .................................................................................................................... 62
“Safe Scrolling” ........................................................................................................................... 63
Selecting the Dynamic Mode ........................................................................................................ 64
Enabling Dynamic PS and Setting the Refresh Rate .................................................................... 64
Entering Dynamic PS Text ........................................................................................................... 64
Tabulated Listing of Encoder Commands and Prompts .............................................................. 65
WARRANTY TERMS AND CONDITIONS ................................................................................. 66
Product Registration Card .............................................................................................................. 67
THIS PAGE
IS INTENTIONALLY
LEFT BLANK
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Tel: +359 56/820027, Fax: +359 56/836700
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Introduction
Deva Broadcast Ltd. was established in 1997 as a broadcasting and telecommunications
equipment importer for Bulgaria and Eastern Europe regions. Subsequently, Deva Broadcast Ltd.
has developed and produced a wide range of low and mid power transmitters, RDS/RBDS Encoders
and Decoders, Modulation Monitors, Remote Controls, Site monitoring and other systems for
many companies. Our high degree engineers accomplish their bright ideas through successful
engineering, marketing and management in Deva Broadcast’s Headquarter in Bulgaria.
During the last ten years the company products have become our partners’ best sellers. After
detailed marketing analysis, our team has decided to launch its own brand products based on the
latest technologies in the broadcasting business. The company’s main goal is to design, develop
and offer a complete line of high quality and competitive products for FM and Digital Radio,
Radio Networks, Telecommunication Operators and regulation authorities. We base our market
authority position on our good after sales support and relation with the clients.
Since 2003 Deva Broadcast Ltd has been ISO 9001:2000 certicated by SGS quality certication
bureau.
The contractors of Deva Broadcast Ltd. are satised with the permanent business comfort and to
their own confession they owe it to a great extent as well as their prosperity to the loyal partnership
of our company.
65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56/820027, Fax: +359 56/836700
E-mail: of[email protected]
Web: www.devabroadcast.com
- 7 -
General Information
The SmartGen 4 is a full-function RadioData encoder that conforms to European and US
standards for FM datacasting. It supports all service IDs and offers simultaneous scrolling-PS and
RadioText messaging.
2-way addressability includes a front-panel USB port for fast and easy static register
programming of station and format IDs, and for entering default scrolling or static text. In full-
dynamic operation, station automation communicates with direct RS-232 serial connection.
Screen-entry Windows® software makes programming the SmartGen 4 simple and foolproof.
The SmartGen 4 can “parse” scrolling text, automatically breaking phrases into word groups, or
can display text with the “Safe-Scrolling” option.
Product Features
• Full-function dynamic encoder connects to station automation
• Transmit song titles, etc. in either ‘block’ or ‘safe scrolling’ modes
• Includes the TA function for trafc message priority override
• Operates with any FM exciter and stereo generator. A dedicated 19kHz sync source is not
required, and a failsafe relay bypass is built in.
• Connects directly to all popular radio automation systems to scroll song titles and advertising.
• Direct-entry programming software runs under Windows® with RS-232 serial and local
USB connectivity.
• Integrates easily with specialized third-party software for increased functionality.
• Loop-through or ‘sidechain’ operation with any exciter/stereo generator combination.
• Simple to install and easy to use!
65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56/820027, Fax: +359 56/836700
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TECHNICAL SPECIFICATIONS
Standards Supported European CENELEC and United States NRSC.
RDS Applications Supported PI, PS, PTY, TP, TA, RT, AF, DI, M/S, FFG. (A detailed
explanation of these applications can be found in section “RDS
Applications Supported” on page 14)
Operating Modes (1) Loop-Through: In loop-through operation, the RDS subcarrier
is internally mixed with the MPX input and the combined signal
is delivered to the RDS OR MPX OUTPUT. The encoder has
unity gain in the loop-through mode and accepts a maximum
level of 6 volts peak-to-peak corresponding to ±75kHz carrier
deviation. Loop-through includes a failsafe Bypass function so
that program audio will not be lost if the encoder loses power.
(2) Sidechain: In sidechain operation, only the RDS subcarrier
appears at the RDS OR MPX OUTPUT. This signal is then
combined with the FM multiplex baseband in the stereo generator
or FM exciter. The monitored MPX (or TTL sync) applied t the
PILOT OR MPX INPUT connector is used solely to synchronize
the 57kHz RDS subcarrier with the 19kHz stereo pilot.
NOTE: The SmartGen 4 is shipped from the factory in the
Sidechain mode.
Pilot or MPX Input An unbalanced, bridging BNC input that accepts either the
composite/ multiplex (MPX) signal or 19kHz TTL-level pilot
sync from the stereo generator.
RDS or MPX Output An unbalanced, low-impedance BNC output to feed a wideband
input of the FM exciter.
RDS Injection Level Continuously adjustable between zero and 2 volts peak-to-peak.
USB Port Front-panel USB connector for quick computer programming of
static data.
Serial Data Port RS-232 port (DB-9) for static programming and dynamic
messaging. 2400, 4800, 9600, 19200, 39400, 57600 or 115200
baud; 8, N, 1, plain-text ASCII protocol.
TA Switching The temporary TA ag is set either by a software command or
with a momentary contact closure through a rear-panel connector.
Power Requirements 105–130VAC or 210–255VAC, 50/60Hz; 10W.
Size and Shipping Weight 1¾”H x 19”W x 6”D (1U), 44 x 485 x 178mm; 7 lbs., 3kg
65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56/820027, Fax: +359 56/836700
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BLOCK DIAGRAM
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FRONT PANEL
POWER ON - This green LED glows whenever primary power is present. If this indicator is off, the encoder will have switched into the failsafe Bypass
mode. In loop-through operation of the encoder, Bypass connects the PILOT OR MPX INPUT directly to the RDS OR MPX OUTPUT.
PILOT LOCK - This LED lights when the encoder has locked to the 19kHz stereo pilot signal from the stereo generator, either in the sidechain or the
loop-through mode of encoder operation.
FREE RUN - When no 19kHz pilot is present at the PILOT OR MPX INPUT, the encoder defaults to a crystal-controlled internal timebase. This enables
RDS transmissions with monaural programming. The FREE RUN LED shows that the encoder has defaulted to its internal timebase.
RDS DATA - This LED ashes dimly as RDS data is being transmitted, serving as an indication that the encoder is operating normally. Even when no
dynamic data is being sent, the various RDS groups of static identiers are updated continually.
TA FLAG - This LED ashes whenever the TA ag is raised, either with a software command or with a switch closure. REMEMBER: the TA ag is
only temporary. It must be turned off as soon as the announcement ends.
ACTIVE PORT indicators show which communications port is currently in use. The lighted indicator will ash perceptibly as data is passed to and from
the encoder.
COM - The COM indicator is the default encoder port and lights when a USB connection is not active.
USB - This LED lights when the USB port is addressed.
FUSE / DISCONNECT - The front-panel fuseholder also provides a means of disconnecting AC mains power in an emergency. Push the fuseholder cap
down and pull it away from the panel to interrupt power.
INJECTION LEVEL ADJUST - RDS injection level (subcarrier modulation) is set with this multiturn trim control. A detailed procedure for setting
injection level can be found in section “Subcarrier Injection Level” on page 27.
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REAR PANEL
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RDS: Europe vs America
The European Broadcasting Union (EBU) and its member countries originated the concept of
“Radio Data” transmission. The European RDS specication, CENELEC Standard EN50067, was
rst published in 1984. It was revised in 1986, 1990, 1991 and 1992.
European RDS has grown in use following initial adoption of the Standard. RDS is nearly
universal throughout Europe; it is almost impossible to nd a European FM broadcasting station
that does not carry a radio data subcarrier.
The popularity of RDS in Europe is very much in contrast with initial reluctance on the part
of US broadcasters to embrace this technology. This can be ascribed to material differences in
broadcasting practices.
Almost without exception, FM broadcasting in the United States is ‘detached’ and independent;
that is, each station originates its own programming. One exception might be America’s National
Public Radio, though for most of the broadcast day even NPR stations originate, or at least schedule,
their own programs.
Much of European broadcasting is similar to the concept of network radio that was common
in the US prior to the 1950s. In Europe, a central program originator may have many transmitting
facilities of modest power situated throughout the country, at several different frequencies to
blanket a designated service area. The European disposition toward lower-power transmitters can
be found on the “local radio” level as well.
The European concept of a service area equates to the US broadcaster’s market. The subtle
difference between these designations further characterizes broadcasting practices and ethics.
RDS benets the European broadcaster through almost an altruistic endeavor to be of service to
his listeners. The US broadcaster is marketing his programming, and is primarily interested in how
he can create additional revenue from RDS.
The RDS System
RDS is a digital data channel transmitted as a low-level subcarrier above the range of the
composite stereo program signal in the FM baseband. The data transmission (baud) rate is
comparatively low, yet it is quite robust because of data redundancy and effective error correction.
It is not within the scope of this Manual to cover the details of RDS subcarrier coding and
modulation. For this the reader is directed to the Specication appropriate to his location, either
the CENELEC EN50067 Specication for Europe, or the United States NRSC Specication. It
is assumed that the user has some familiarity with the concept of RDS, since the balance of this
Manual will deal with specic implication of RDS implemented with the SmartGen 4.
65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56/820027, Fax: +359 56/836700
E-mail: of[email protected]
Web: www.devabroadcast.com
- 13 -
Addressing The SmartGen 4
Many applications, such as Radio Paging, navigational assistance, roadside message billboards,
song titles, stock market updates, etc. all require continuous, on-line access to the RDS encoder
by one or more service providers. Some of these applications may promise additional revenue
to the station. The SmartGen 4 offers these capabilities and may be addressed by simple ASCII
commands, either from station automation or directly by a connected computer.
Particularly in Europe, RDS encoders may be linked with one another for network support
applications. The UECP, or Universal Encoder Communication Protocol was developed by
CENELEC to support this form of operation, but over the years has seen decreased usage in
favor of TCP/IP addressability or direct connection with station automation. The SmartGen 4 fully
supports the UECP.
65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56/820027, Fax: +359 56/836700
E-mail: of[email protected]
Web: www.devabroadcast.com
- 14 -
RDS Applications Supported
The following is an alphabetical listing of RDS applications that are fully supported by the
SmartGen 4. The standardized RDS application abbreviation is followed by an expansion of the
application name and a short explanation of the function.
AF
List of Alternative Frequencies: A network broadcaster, or one with low-power rebroadcast
transmitters (translators) to ll holes in his coverage area, can include a list of all frequencies where
the identical program can be heard simultaneously. The RDS receiver (particularly the upscale car
radio) constantly searches for the best signal that carries the very same program. When a better
signal is found, the radio re-tunes with no noticeable interruption. The principal utility of this RDS
function is with European radio networks and US stations with ‘translators.’
DI
Decoder Information: This is one of several ‘ags’ that convey yes/no or other very basic data.
This particular ag tells the receiver whether the broadcast is monaural, or is being transmitted in
any of several methods of stereo or binaural broadcasting. As many as 16 encoding options may
be accommodated! This is a rather esoteric function and, thus far, remains unused both in Europe
and in the US.
FFG
Free Format Groups: A provision has been included in the SmartGen 4 to transmit
proprietary data directly within a legitimate RDS group. This is a special use of the encoder for
non-standard applications. Additional notes can be found on section “Scrolling Display And
Dynamic Encoder Operation” on page 61.
M/S
Music / Speech Switch: This ag simply indicates whether music or speech is the primary
broadcast programming. The purpose of this function is not well explained in the respective
Standards; hence it comes as no surprise that it is not widely used.
PI
Program Identication: This block of data identies the broadcast station with a hexadecimal
numerical code, which becomes the “digital signature” of the station. The code is assigned by the
broadcasting authority in most countries, but in the US it is calculated from a numerical encoding
of station call letters. The receiver processes the PI code to assist automatic tuning features (station
memories), and to prevent false switching to alternative frequencies that might be shared by
broadcasters in nearby regions.
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Tel: +359 56/820027, Fax: +359 56/836700
E-mail: of[email protected]
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PS
Program Service Name: This is the station’s “street name” that will appear on the receiver
faceplate display. The PS can be up to eight characters in length (including spaces) and can be as
simple as the station’s call letters: KWOW or KWOW FM, or a slogan: NEWSTALK or LIVE 95.
The Program Service Name is automatically displayed, even on automobile receivers, and because
of driving safety considerations broadcasters are generally discouraged from scrolling messages
in this eld. As a matter of fact, it is a violation of both the CENELEC and the NRSC standards to
scroll the PS display, although the practice has become universally common.
PTY
Program Type: The PTY data ag identies the station format from a collection of pre-dened
categories. Many RDS receivers are able to seek the listener’s preferred format automatically.
This means that a car radio can switch from a fading station to a stronger one that carries the
same variety of music, though not the very same program, as provided by AF switching. The
PTY function of RDS helps a broadcaster catch ‘transient audience’ share. A listing of the PTY
categories is given on section “Static Data Programming” on page 54.
Under some programming circumstances, the PTY identier may be made ‘dynamic,’ changing
between categories for a station that “dayparts” (changes its format for specic time periods).
The PTY code is not meant to change from song to song or to accommodate a top-of-the-hour
newscast, however.
RT
RadioText: This is a 64-character block of plain text that the listener can select for visual
display on the faceplate of the radio by pressing an INFO button on the receiver. This function is
not available on many automobile radios for safety reasons, which has precipitated the frowned-
upon practice of scrolling the PS eld instead.
Most radios have limited alphanumeric display capability, so the 64 characters of RadioText
march across the front panel, much akin those annoying LED advertising signs found in airport
buses or fast food emporia. Like the scrolling-PS implementation, RadioText can announce song
titles and performers, run special promotions or contests, or broadcast sponsors’ messages.
TA
Trafc Announcement: This is a temporary ag added to the RDS data stream only as a trafc
bulletin is being aired. Some RDS car radios can be set to search for trafc bulletins among various
TP stations (see TP below) while tuned to a listener’s preferred program, or even while playing
a tape or CD. As soon as any TP station broadcasts a trafc bulletin, the receiver temporarily
switches-over to receive it. When the bulletin is nished, the receiver switches back to the original
program, tape or CD.
TP
Trafc Program Identication: The TP ag identies the station as one that routinely
broadcasts trafc bulletins for motorists as part of its normal, everyday programming. When the
TP ag is displayed on the receiver faceplate, the radio is searching for trafc announcements. The
radio keeps track of TP stations offering this service to speed up the search-and-switch process.
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Before you start
SAFETY WARNING
After removing any housing parts and electronic assemblies it is possible to get access to live
parts. It is essential to ensure that the subsequent safety rules are strictly observed:
• Servicing of electronic equipment must be performed by qualied personnel only.
• Before removing covers the equipment has to be switched off and the mains cable unplugged.
• When the equipment is open the power supply capacitors have to be discharged by the help
of a suitable resistor.
• During servicing unprotected and operating equipment:
- never touch bare wires or circuitry.
- use insulated tools only.
- never touch metal semiconductor cases because they may carry high voltages.
• For removing and installing electronic components, please follow the recommendations
concerning the handling of MOS components.
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Tel: +359 56/820027, Fax: +359 56/836700
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- 17 -
OPERATING RECOMMENDATIONS
For the normal and reliable operation of the SmartGen 4 device and reaching better performance
we recommend to follow the next list of instructions:
• Please, install the unit only in places with good air conditioning. The unit has been designed
for operation within an ambient temperature range extending from 10 to 50°C. But because
adjacent, less efcient equipment may radiate substantial second-hand heat, be sure that the
equipment rack is adequately ventilated to keep its internal temperature below the specied
maximum ambient. When installing, leave a clearance of at least 1 cm around the equipment
to allow air to pass freely.
• We do not recommend installation in rooms with high humidity, dusty places or other
aggressive conditions.
• Although it is expected that a SmartGen 4 will be installed close to exciters (or transmitters
of even higher-power!), please practice reasonable care and common sense in locating the
unit away from abnormally high RF elds.
• Please, use only already checked power supply cables and sources. The shielded cables
usage is strongly recommended.
• We strongly recommend connecting the device only to reliable power supply sources. In
case of unstable power supply, please use UPS (Uninterruptible Power Supply).
• Please, use the device only with placed top cover to avoid any electromagnetic anomalies
which may cause problems of the normal functionality of the unit.
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E-mail: of[email protected]
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Unpacking and Inspection
IT IS VERY IMPORTANT that the Warranty Registration Card found at the front of this
Manual be completed and returned. Not only does this assure coverage of the equipment under
terms of the Warranty and provide a means of tracing lost or stolen gear, but the user will be sent
specic SERVICE OR MODIFICATION INSTRUCTIONS issued by Deva Broadcast.
As soon as the equipment is received, inspect carefully for any shipping damage. If damage is
suspected, notify the carrier at once, and then contact Deva Broadcast.
We recommend that you retain the original shipping carton and packing materials, just in
case return or reshipment becomes necessary. In the event of return for Warranty repair, shipping
damage sustained as a result of improper packing for return may invalidate the Warranty!
Mounting
RACK REQUIREMENT
The SmartGen 4 mounts in a standard 19-inch equipment rack and requires only 1¾ inches
(1U) of vertical rack space. The use of plastic washers is recommended to protect the painted nish
around the mounting holes.
HEAT DISSIPATION
Consuming less power than the light in a refrigerator, the SmartGen 4 itself generates negligible
heat. The unit is specied for operation within an ambient temperature range extending from
freezing to 120°F/50°C. But because adjacent, less efcient equipment may radiate substantial
heat, be sure that the equipment rack is adequately ventilated to keep its internal temperature
below the specied maximum ambient.
AC (MAINS) Power
FUSEHOLDER
The fuseholder is at the far left of the front panel. Apply downward pressure and pull the cap
outward to access the 5mm mains fuse. Note that the cap has space for a spare fuse as well. The
cap is reseated by reversing the removal process. This fuse also serves as a front-panel emergency
power disconnect for the SmartGen 4 in lieu of a front-panel power switch.
MAINS VOLTAGE SELECTOR
Unless specically ordered for export shipment, the SmartGen 4 is set at the factory for
operation from 115V, 50/60Hz AC mains. This can be conrmed by checking the designation next
to the mains connector on the rear panel. The inappropriate voltage and fuse value will have been
crossed out at the factory with an indelible felt marker. To change the mains voltage, rst remove
65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56/820027, Fax: +359 56/836700
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- 19 -
the top cover of the unit. A clearly marked slide switch is next to the AC mains connector on the
encoder circuit board. With power disconnected, use a small screwdriver to set the switch for
115VAC or 230VAC operation. Be sure to install the appropriate fuse listed on the rear panel. You
can remove the factory strikethrough with (a probably carcinogenic!) solvent, and then cross out
the inappropriate marking with an indelible felt pen.
POWER CORD
The detachable IEC-type power cord supplied with the encoder is tted with a North-American-
standard male plug. The individual cord conductors may be color-coded in either of two ways:
1) In accordance with US standards:
BLACK = AC “HOT”
WHITE = AC NEUTRAL
GREEN = EARTH GROUND
2) To European CEE standards:
BROWN = AC “HOT”
BLUE = AC NEUTRAL
GREEN/YELLOW = EARTH GROUND
GROUND LOOPS
Because the unbalanced PILOT OR MPX INPUT and the RDS OR MPX OUTPUT of the
SmartGen 4 are chassis-ground-referenced, a mains frequency or RF ground loop could be formed
between the input or output cable shield grounds and the AC power cord ground. A ‘ground-lifting’
AC adapter may well remedy such a situation, although the chassis somehow must be returned
to earth ground for safety. Generally, being screwed-down in the equipment rack will satisfy the
safety requirement.
65 Aleksandar Stamboliyski Str., 8000 Bourgas, Bulgaria
Tel: +359 56/820027, Fax: +359 56/836700
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- 20 -
Selection of Operating Modes
SIDECHAIN MODE
Congured for sidechain operation, the rear-panel PILOT OR MPX INPUT connector simply
bridges (monitors) the output of the stereo generator to derive timing information from the 19kHz
stereo pilot. Alternatively, a TTL-level 19kHz sync squarewave may be applied to this input. We
do not recommend this, however, as the phase relationship between the synchronizing squarewave
and the 19kHz pilot component in the composite, multiplex output of the stereo generator may not
be assured.
In sidechain operation the RDS OR MPX OUTPUT will contain only the RDS subcarrier,
the composite/MPX signal is not routed through the SmartGen 4. This operating mode best
preserves multiplex signal integrity and assures uninterrupted program transmission in the event
of a catastrophic encoder failure (very doubtful). As delivered, the SmartGen 4 is congured for
sidechain operation.
Referring to the jumper installation drawing, Figure below, locate the 3-terminal jumper strip,
located about an inch (2.54 cm) to the rear of the two BNC connectors on the SmartGen 4 circuit
board. The shorting clip is positioned “down” for sidechain operation, as shown in the example of
Figure below.
LOOP-THROUGH MODE
When the SmartGen 4 is jumpered for loop-through operation, the RDS subcarrier is internally
combined with the composite/MPX signal. This means that the RDS OR MPX OUTPUT will
include the composite/MPX program signal (at unity gain) with the RDS subcarrier added. Also,
in the loop-through mode the internal bypass relay will pass-through the multiplex signal in the
event of an encoder power failure. The lower illustration in Figure below, shows the “up” position
of the shorting clip for loop-through operation.
Encoder Mode Jumpering
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