Related Manuals for Inovonics 540
Summary of Contents for Inovonics 540
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Page 1: Instruction Manual
OPERATING 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... - Page 2 —– USER’S RECORD —– Model 540 - Serial No. _______ Date Purchased _____________ 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 •...
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Page 3: Table Of Contents
TABLE OF CONTENTS Section I - INTRODUCTION Model 540 Product Description ....................General - FCC Type Acceptance - Features Model 540 Technical Specifications ..................Block Diagram ........................... Section II - INSTALLATION Unpacking and Inspection ....................... Mounting ............................ Rack Requirements - Heat Dissipation AC (Mains) Power ........................ - Page 4 RDS Option Plug-In Assembly ....................Baud Rate Jumper Power Supply ........................... Model 540 Calibration Procedures ..................R14: Input Gain and Flatness Check - R19 and R64: Injection and Data Level Set - R20: SCA Deviation - R21: SCA Audio Level Set Section VI - APPENDIX Parts Lists - Schematics - Warranty .................
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Page 5: Section I - Introduction
System) information, and various existing-and-proposed “high-speed” digital services which provide paging and other one-way data communications. The 540 accepts the demodulated FM “baseband” signal feed from any Modulation Monitor. It is frequency-agile, tuning any subcarrier frequency between 54kHz and 99kHz with digital precision. Bargraph metering displays subcarrier injection, as well as subcarrier deviation for SCA audio transmissions. -
Page 6: Model 540 Technical Specifications
MODEL 540 TECHNICAL SPECIFICATIONS Subcarrier Tuning Range: Metering: 54kHz to 99kHz in 1kHz The 38-segment bargraph display increments. is peak-responding and incorporates a peak-hold feature. Subcarrier Injection Measurement: SCA Audio Response: a: ±1kHz to ±10kHz of main ±0.5dB, 50Hz to 5kHz. Switch carrier deviation with ±250Hz... -
Page 7: Block Diagram
BLOCK DIAGRAM A simplified Block Diagram of the Model 540 is shown in Figure 1, below. Monitor circuitry is detailed in the Circuit Descriptions section beginning on Page 15. These descriptions reference Schematic Diagrams found in the Appendix. INPUT FIRST MIXER... -
Page 8: Section Ii - Installation
AC (MAINS) POWER Unless specifically ordered for export shipment, the Model 540 is set at As delivered the factory for operation from 115V, 50/60Hz AC mains. The rear-panel designation next to the fuseholder will confirm both the mains voltage —... -
Page 9: Radio Frequency Interference (Rfi)
Generally, being screwed-down in the equipment rack will satisfy the safety requirement. JUMPERING OPTIONS The Model 540 has but a single jumpering option. It selects either 50µs or 75µs de-emphasis for the monaural, main-channel program audio —... - Page 10 which is routed to the front-panel jack in the PHONES CALIBRATION 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.
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Page 11: Section Iii - Setup And Operation
Please at least scan this section to verify that your understanding is in agreement with our terminology. METER This pair of up/down buttons cycles the Model 540 among its various monitoring functions. The SELECT selected function is indicated by an attendant LED. -
Page 12: Mpx Input And Level Set
measurement to indicate “0dB” at an SCA subcarrier deviation of ±5kHz, at a frequency below the influence of de-emphasis. This calibration may be reset for another reference if desired, the procedure is given on Page 20. SUBCARRIER Use this pair of up/down buttons to tune the subcarrier frequency. -
Page 13: Adjustment
540 is very easy. Simply adjust the 540’s rear-panel control until the bargraph display reaches the INPUT GAIN mark on the scale. -
Page 14: Section Iv - Rds-Decode Option
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 connector cutout will have been covered by a plastic RDS DATA OUT escutcheon. -
Page 15: Installing The Software
Connect the Model 540 to either the COM 1 or the COM 2 port of the computer. Use a serial interface cable terminating in a DB-9 connector. Cables with the larger DB-25 connectors will require a 9-to-25-pin adapter on the end plugging into the Model 540. - Page 16 The opening DETECT screen lists the functions which will be decoded, The DETECT and the RDS groups which contain this information. Press Screens bring up the main, data display screen. Pressing will exit the program and return to a DOS prompt at any point. The first line of the data display screen shows the station’s hexadecimal PI Code (Program Identification), or “digital address.”...
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Page 17: Section V - Circuit Descriptions
The Model 540 schematic diagram consists of four sheets. Sheets 1 and 2 cover the main circuit board. Sheet 3 shows components on the separate front-panel circuit assembly, and Sheet 4 is a diagram of the optional RDS data-recovery plug-in module. -
Page 18: First If And Second Lo
band noise above 100kHz. The selected band of frequencies is buffered by IC8A which, along with companion inverting stage IC8B, provides push-pull drive to the first balanced mixer, IC9. Front-panel buttons S503 and S504 are read by Programmable SUBCARRIER TUNING the PIC, IC6. -
Page 19: Third(!) Conversion
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 mode, a composite/MPX sample from CALIBRATE (±75kHz) input buffer IC7A is delivered to the meter. For subcarrier injection... -
Page 20: Rds Option Plug-In Assembly
AC mains connector. The factory setting is 9600 baud. POWER SUPPLY (Schematic Sheet 2) Model 540 circuitry utilizes ±9-volt supplies for op-amps and other linear circuitry demanding signal headroom, and a +5-volt supply for digital logic. These three sources are each regulated by a “3-terminal”... -
Page 21: Model 540 Calibration Procedures
Flatness mod-monitor. The setting of this control is not relevant to 540 internal Check calibration. R14 is adjusted at the factory so that the 540 indicates the “set point” in the mode when a 76kHz sinewave is CALIBRATE (±75kHz) applied to the at a peak-to-peak level of 3 volts. -
Page 22: Level Set
between 71kHz and 81kHz, indicating a flat 10kHz passband in the measurement mode. WIDE 1. Reset the audio generator frequency to 76kHz, and the level to R19 and R64: obtain a “set point” indication in the position of Injection and CALIBRATE ±75kHz switch. -
Page 23: Section Vi - Appendix
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. — —... -
Page 24: Parts List
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 spacing of 0.2 inch. Preferred part: Wima MKS-2 or FKC-2 series. - Page 25 Heat Fin) Integrated Cct.; (open mfgr.) LM337-T (Uses Aavid 574602 B03700 Heat Fin) Integrated Cct.; Motorola MC145151 Integrated Cct.; SPECIAL FACTORY-PROGRAMMED “PIC,” type 16C62A. Order by designation, reference Model 540. IC7,8, Integrated Cct.; (open mfgr.) LF353N 12-14,19-27 IC9,15,30 Integrated Cct.; Philips NE602N IC501-504 Integrated Cct.;...
- Page 26 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;...
- Page 27 INOVONICS WARRANTY TERMS OF SALE: Inovonics products are sold with an understanding of “full satisfaction; that is, full credit or refund will be issued for products sold as new if returned to the point of purchase within 30 days following their receipt, provided that they are returned complete, and in an “as...
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