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Section III

SETUP AND OPERATION

PANEL CONTROLS AND INDICATORS

This section starts with an overview of front-panel controls and

indicators. Please at least scan this section to verify that your

understanding is in agreement with our terminology.

METER

SELECT

This pair of up/down buttons cycles the Model 540

among its various monitoring functions. The

selected function is indicated by an attendant LED.

The functions are:

CALIBRATE

– in this setup mode, metering and

audio monitoring is switched-over to a

measurement of total baseband modulation

(primary carrier deviation). The corresponding set

point (above the 10% scale designation) allows gain

to be adjusted such that this mark coincides with

full carrier modulation; that is, “100%” or ±75kHz

carrier deviation. For proper annotation in this

mode, multiply the indicated percentage or kHz-

deviation numbers by 10. (FS=130% or ±100kHz)

PERCENT INJECTION

– this scale and the

±kHz

INJECTION

scale are active when measuring the

modulation contribution of the tuned subcarrier.

The 10% point on the upper scale is opposite the

±7.5kHz point on the one below, indicating the

relationship of these measurements to “full”

modulation; that is, 100% or ±75kHz carrier

deviation.

SCA ±kHz DEVIATION

– this measurement option

displays the actual deviation of the audio-

modulated SCA subcarrier. It is a valid

measurement

only

for SCA, and is

completely

meaningless

for digital data subcarriers. This

measurement is not affected by

SCA AUDIO

(de-

emphasis) selection.

SCA AUDIO LEVEL

– this is a

relative

, dB-calibrated

scale for measurement of SCA program levels, and

will reflect a

FLAT

or a

DE-EMPH

(de-emphasized)

SCA AUDIO

selection. Factory calibration sets this

measurement to indicate “0dB” at an SCA

Содержание 540

Страница 1: ...ING AND MAINTENANCE INSTRUCTION MANUAL MODEL 540 FM SUBCARRIER MONITOR DEMOD __________ interstage Phistersvej 31 2900 Hellerup Danmark Telefon 3946 0000 fax 3946 0040 www interstage dk pro audio with a smile ...

Страница 2: ...____________ Warranty Card Mailed OPERATING AND MAINTENANCE INSTRUCTION MANUAL MODEL 540 RDS RBDS RADIODATA ENCODER January 1998 Effective with Serial No 026 1305 Fair Avenue Santa Cruz CA 95060 TEL 408 458 0552 FAX 408 458 0554 Visit our Website www inovon com ...

Страница 3: ...Power Cord Radio Frequency Interference RFI 7 Location Ground Loops Jumpering Options 7 Section III SETUP AND OPERATION Panel Controls and Indicators 9 Meter Select Subcarrier Tuning Filter SCA Audio Phones Power MPX Input and Level Set 10 Input Connection Correcting for Response Errors Input Level Adjustment Section IV RDS DECODE OPTION Installing the Optional Plug in RDS Card 12 Computer Require...

Страница 4: ... IF and Second LO Second IF and SCA Demodulation 16 Second IF Filter SCA Demodulator De Emphasis Audio Output and Monitoring Third Conversion 17 LO and Mixer IF Filtering Metering 17 Metering Selector Meter Rectifier Bargraph Display RDS Option Plug In Assembly 18 Baud Rate Jumper Power Supply 18 Model 540 Calibration Procedures 19 R14 Input Gain and Flatness Check R19 and R64 Injection and Data L...

Страница 5: ... headphones and is available at a rear panel connector as well FCC Type Acceptance Equipment for monitoring broadcast transmissions in the U S no longer requires type acceptance by the Federal Communications Commission Though rules pertaining to monitoring equipment have been relaxed or abandoned the broadcaster remains responsible in ensuring that his transmitted signal conforms to current FCC re...

Страница 6: ...on is monitored in the CALIBRATE mode and adjusted to reflect the station s primary Modulaton Monitor readings Metering The 38 segment bargraph display is peak responding and incorporates a peak hold feature SCA Audio Response 0 5dB 50Hz to 5kHz Switch selection of FLAT or 150 micro second DE EMPH asis SCA Distortion and Noise Better than 40dB unweighted below 5kHz deviation Audio Outputs a Rear p...

Страница 7: ...Model 540 FM Subcarrier Monitor Demod MPX INPUT 50kHz 100kHz BANDPASS INPUT GAIN FIRST MIXER 455kHz BAND PASS SECOND MIXER 25kHz BAND PASS SYNTHESIZER CONTROLLER SYN LO 67 SUB TUNING 480kHz LO DOUBLING MONOSTABLE 5kHz LOW PASS SCA DE EMPHASIS 25kHz LO 3kHz LOW PASS M E T E R I N G S E L E C T O R METER RECT METER INTEG MAIN CHAN DE EMPHASIS BALANCED SCA AUDIO PHONES DE EMPH FLAT SCA THIRD MIXER FI...

Страница 8: ... SERVICE OR MODIFICA TION INSTRUCTIONS should they be issued by Inovonics MOUNTING Rack Requirement The Model 540 Monitor mounts in a standard 19 inch equipment rack and requires only 1 inches 1U of vertical rack space Plastic finishing washers will protect the painted finish around the mounting holes Heat Dissipation Consuming about the same power as a single string of Christmas twinkle bulbs the...

Страница 9: ...or is fitted with a North American standard male plug Nevertheless the individual cord conductors are supposed to be color coded in accordance with CEE standards that is BROWN AC HOT BLUE AC NEUTRAL GRN YEL GROUND If this turns out not to be the case we offer our apologies cord vendors sometimes lie to us and advise that US color coding applies BLACK AC HOT WHITE AC NEUTRAL GREEN GROUND RADIO FREQ...

Страница 10: ...ATION mode The de emphasis jumper strip is located to the left of IC28 The circuit board legend identifies the 50 and 75 microsecond positions for the movable jumpering shunt this jumper will have been positioned appropriately for the original shipping destination ...

Страница 11: ...tion For proper annotation in this mode multiply the indicated percentage or kHz deviation numbers by 10 FS 130 or 100kHz PERCENT INJECTION this scale and the kHz INJECTION scale are active when measuring the modulation contribution of the tuned subcarrier The 10 point on the upper scale is opposite the 7 5kHz point on the one below indicating the relationship of these measurements to full modulat...

Страница 12: ... audio characteristic will be imparted to the front panel PHONES jack the rear panel SCA BALANCED AUDIO connector and to metering in the SCA AUDIO LEVEL dB scale measurement mode PHONES This stereo jack accommodates a pair of standard headphones In the CALIBRATE mode a de emphasized baseband monaural program signal is routed to this jack In all other operating modes the headphones will monitor the...

Страница 13: ... composite output connection calibration of the 540 is very easy Simply adjust the 540 s rear panel INPUT GAIN control until the bargraph display reaches the CALIBRATE mark on the scale This is directly above the 10 designation and corresponds to 100 carrier modulation If the mod monitor does not have a built in calibration source an equally accurate adjustment may be made by driving the exciter t...

Страница 14: ...M compatible computer Supplied software decodes the RDS data so that it may be read INSTALLING THE OPTIONAL PLUG IN RDS CARD If the Model 540 was supplied without the RDS Option the rear panel RDS DATA OUT connector cutout will have been covered by a plastic escutcheon This may be removed and the plug in Option card installed as follows First remove two jackscrews from the DB 9 connector of the pl...

Страница 15: ...all files from the diskette to the hard drive RUNNING THE DETECT PROGRAM Starting the Program Under DOS Two versions of the DETECT RDS decode program have been included in the 540RDS directory The version you are most likely to use is for a 9600 baud data interchange rate A second version supports 2400 baud though the only reason to use this slower rate might be to communicate with the Model 540 o...

Страница 16: ...list of all dial positions at which identical programming can be heard This will include the station s main transmitter and all translators or re broadcast facilities The list is displayed as received and with a little practice you should be able to catch all frequencies as they flash before you Audio Decoder Information identifies mono or stereo transmissions DI and whether the program being broa...

Страница 17: ...onents begin with the number 1 i e R1 C1 IC1 Front panel components are in the five hundred series i e R501 S501 Since it is a separate circuit altogether the RDS plug in has its own very short series of numbers again beginning R1 C1 etc The front panel circuit assembly interconnects with the main board with short ribbon cable jumpers J503 on the front panel assembly mates with J3 on the main boar...

Страница 18: ...ting band pass function is the WIDE SCA characteristic of the front panel FILTER selector This signal is presented to analog switch section IC28B to select injection measurement bandwidth also to the SCA demodulator and to yet another conversion process for further subcarrier selectivity filtering SCA Demodulator One section of hex inverter IC18A is biased into a quasi linear operating mode to aff...

Страница 19: ...l up down METER SELECT buttons are read by the PIC microcontroller which in turn sends a 2 bit binary address to a dual 1 of 4 analog switch IC10 IC10A lights LEDs to indicate which scale and metering function have been selected IC10B routes the selected signal to the metering rectifier In the 540 s CALIBRATE 75kHz mode a composite MPX sample from input buffer IC7A is delivered to the meter For su...

Страница 20: ...ck and data both derived from the incoming RDS subcarrier Shift register IC3 converts RDS clock and serial data to an 8 bit parallel format This scrolling data byte is presented to a PIC microcontroller used in this instance as a sort of transmit only UART Universal Asynchronous Receiver Transmitter RDS clock pulses are also fed to the PIC Between these two input sources the PIC magically sorts ou...

Страница 21: ... when a 76kHz sinewave is applied to the COMPOSITE MPX INPUT at a peak to peak level of 3 volts 1 An existing setting of the INPUT GAIN control need not be disturbed With the generator frequency set to 76kHz simply adjust the variable output attenuator for a set point indication in the CALIBRATE 75kHz position of the METER SELECT switch 2 As you tune the generator between 100Hz and 100kHz there sh...

Страница 22: ...ction generator Either piece of gear must be capable of accurate frequency modulation to a known calibration standard Bessel nulls can be used to accurately set the deviation of an SCA generator but description of this technique is beyond the scope of this Manual Lacking the required equipment for this calibration you can still proceed with the injection measurement checks If you find these close ...

Страница 23: ... 21 Section VI APPENDIX The following section of this Manual contains Parts Lists and Schematic Diagrams for the Model 540 and an explanation of Inovonics Warranty Policy ...

Страница 24: ... below capacitors are specified as follows a Under 100pF are the dipped or silver mica type DM 15 or CM 05 military series size designation P value is picofarads 5 200VDC open mfgr b 100pF to 0 47µF are of the metalized mylar or polyester variety Whole number P values are picofarads decimal values are microfarads 5 50VDC or better The style used in the 540 is the minibox package with a lead spacin...

Страница 25: ... PIC type 16C62A Order by designation reference Model 540 IC7 8 12 14 19 27 Integrated Cct open mfgr LF353N IC9 15 30 Integrated Cct Philips NE602N IC501 504 Integrated Cct open mfgr LM3914N J1 AC Mains Connector PC mounting Switchcraft EAC303 J5 6 PC mounting TRS stereo phone jack Switchcraft RN 112 BPC J601 Connector chassis mounting male BNC Amphenol 31 221 L1 4 Inductor 1mH J W Miller 9220 2 Q...

Страница 26: ...es reputable suppliers of both large and small quantities of parts Any semiconductor IC capacitor resistor or connector used in the Model 540 is probably available from one or more of these firms Each supplier publishes a full line catalog available free for the asking Minimum order restrictions may apply and export orders may be difficult Mouser Electronics Call 800 346 6873 Digi Key Corporation ...

Страница 27: ...cs Inc products are warranted to be free from defects in materials and workmanship A Any discrepancies noted within 90 days of the date of delivery will be repaired free of charge or the equipment will be replaced at the option of Inovonics B Additionally parts for repairs required between 90 days and one year from the date of delivery will be supplied free of charge Labor for factory installation...

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