Inovonics 630 Operating And Maintenance Instruction Manual
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Inovonics 630 Operating And Maintenance Instruction Manual

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OPERATING AND MAINTENANCE
INSTRUCTION MANUAL
MODEL 630
FM RELAY RECEIVER
__________

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Summary of Contents for Inovonics 630

  • Page 1 OPERATING AND MAINTENANCE INSTRUCTION MANUAL MODEL 630 FM RELAY RECEIVER __________...
  • Page 2 —– USER’S RECORD —– Model 630 - Serial No. _______ Date Purchased _____________ Warranty Card Mailed — ¨ OPERATING AND MAINTENANCE INSTRUCTION MANUAL MODEL 630 FM RELAY RECEIVER June, 1996 1305 Fair Avenue, Santa Cruz, CA 95060 TEL: (408) 458-0552 – FAX: (408) 458-0554...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Section I - INTRODUCTION Model 630 Product Description ................... General - Features Model 630 Technical Specifications..................Block Diagram ........................Section II - Installation and Connection Unpacking and Inspection ....................Mounting ..........................Rack Requirements - Heat Dissipation AC (Mains) Power .........................
  • Page 4 Section IV - Calibration Calibration .......................... Equipment Required - Power Supply Check - Synthesizer PLL Frequency - Tuner and IF Adjustments - Mute Level Cal - Composite-Baseband Equalization - Demodulation Separation - Line Output and Meter Calibration - Multipath Filter Tuning Section V - Circuit Descriptions Circuit Descriptions ......................

  • Page 5: Section I - Introduction

    The receive frequency is user-programmable over the FM broadcast band in 100kHz increments. The 630 has two outputs: a conditioned composite “baseband” output which may be fed directly to the broadband input of an FM exciter, and balanced program line outputs which provide demodulated left- and right-channel stereo audio.

  • Page 6: Model 630 Technical Specifications

    MODEL 630 TECHNICAL SPECIFICATIONS Receiver Sensitivity: Frequency Response (of de- 10µV for 50dB stereo SNR with modulated program audio): WIDE IF. ±0.5dB, 20Hz–15kHz Receiver Selectivity: Noise (in demodulated stereo WIDE IF: –6dB at ±150kHz; program audio): NARROW IF: –6dB at ±75kHz.

  • Page 7: Block Diagram

    BLOCK DIAGRAM A simplified Block Diagram of the Model 630 is shown below. Receiver circuitry is explained in detail in the Circuit Descriptions starting on Page 22, which reference Schematic Diagrams found in the Appendix. — —...

  • Page 8: Section Ii - Installation And Connection

    AC (MAINS) POWER Unless specifically ordered for export shipment, the Model 630 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 selected and the value of the fuse supplied.

  • Page 9: Radio Frequency Interference (Rfi)

    ANTENNA CONSIDERATIONS The 630 has a rear-panel “F” connector for the receiving antenna. This is a 75-ohm unbalanced input which should be fed with 75-ohm foil- shielded coax cable. Appropriate cable and the “F” connector are standard items with consumer cable-TV equipment in the U.S.

  • Page 10: Programming The Receive Frequency

    The “tuned-cavity” trap will probably prove best for this job. PROGRAMMING THE RECEIVE FREQUENCY The 630 is tuned by programming the SET FREQ. “DIP” switch beneath the top cover. This is located on the circuit board directly behind the front-panel headphone jack.

  • Page 11: De-Emphasis Selection

    IC39. Figure 2, below, illustrates Model 630 programming for a receive frequency of 103.1MHz. Figure 2 - DIP-Switch Programming for 103.1MHz Station Reception DE-EMPHASIS SELECTION The rear-panel left- and right-channel PROGRAM LINE OUTPUT follows the transmission de-emphasis characteristic. Either the 50- or the 75- microsecond curve may be selected.

  • Page 12: Audio Loss Delay Jumpering

    AUDIO LOSS DELAY JUMPERING The 630 signals a remote alarm for loss of program audio. The delay between the loss of audio and the alarm output may be set for one, two or four minutes of “dead air.” This selection is made with a jumper selection beneath the top cover.

  • Page 13: The Stereo Program Line Output

    The PROGRAM LINE OUTPUT may be connected to transformer- balanced or active-balanced inputs. Should you require an unbalanced output from the 630, use only the + and G terminals from each channel, do not ground the unused – terminal. REMOTE CONTROL INPUTS AND ALARM OUTPUTS A 16-position terminal block affords access to the various logic inputs and outputs of the 630 Receiver.

  • Page 14: Section Iii: Panel Controls And Indicators

    its own protection against induced back-EMF. This usually takes the form of a parallel diode properly connected with regard to polarity. Four of the operating options may be remotely selected. These are: the Remote Control narrow IF bandwidth (IF NAR), defeat of the “mute” function (MUTE Inputs DEF), defeat of the “blend”...

  • Page 15: Panel Controls And Indicators

    PANEL CONTROLS AND INDICATORS This section describes the function and operation of all front-panel controls as they appear, left-to-right, on the front of the 630. Discussions in this section also explain how and when certain functions are used, plus other factors which apply to everyday operation. Please,...
  • Page 16 TOTAL (percentage modulation) scale. While the MOD % 630 lacks the accuracy, resolution and proper ballistics of a true FM “Mod- Monitor,” this reading will give a quite accurate indication of incoming carrier deviation to the nearest 5%.
  • Page 17 It has no effect on the composite- multiplex output signal. A ground applied to the rear- panel STER DEF terminal will also place the 630 in a forced-mono reception mode. The front-panel DEFEAT and ENABLE LEDs will always indicate the actual reception mode, whether selected by the front-panel switch or by the rear-panel terminal.
  • Page 18 With the MUTE switch set to ENABLE, both the MUTE composite-multiplex output and the left- and right- channel program line outputs are muted when a fading carrier triggers a LOW SIGNAL alarm. (See discussion under FAULT indicators.) This MUTE function may be locally disabled by setting the front-panel switch to DEFEAT, or remotely by grounding the rear-panel MUTE DEF terminal.
  • Page 19 Section IV CALIBRATION The Model 630 Relay Receiver does not require routine calibration. In normal operation the 630 can be expected to maintain its specification over an indefinite period. Should a catastrophic failure occur, necessitating replacement of component parts in critical circuits, return to proper operation may be confirmed by following the adjustment procedure given below.
  • Page 20 3. Connect the rear-panel COMPOSITE MPX OUTPUT of the Model 630 to the composite-baseband input of the Modulation Monitor. Adjust the MPX OUTPUT LEVEL control of the Model 630, and/or the input level control of the Mod-Monitor, for a Total (peak) Modulation indication of 100% (±75kHz deviation).
  • Page 21 “compromise” setting for best overall separation performance. 8. Check R-into-L separation also. Since there is nothing in the Model 630 circuitry (to this point) which could cause asymmetrical separation, question the instrumentation if separation is not symmetrical.
  • Page 22 R51 may safely be left as factory-set, or adjusted so that the MULTI-PATH measurement goes just off-scale (below –20dB) when the Model 630 is tuned to a very- nearby, lightly-processed station received with a directional antenna.
  • Page 23 4. Monitor the right-hand end of R80 with the Oscilloscope using the 10:1 probe. The is rectified DC from the filter circuit and will be on the order of +3 volts. 5. Adjust R52 for a peak in the DC level. 6.
  • Page 24 Section V CIRCUIT DESCRIPTIONS This section details circuitry of the Inovonics Model 630 FM “Relay” Receiver. Circuit descriptions refer to the three pages of Schematic Diagrams contained in the Appendix, Section VI, Pages 33, 34 and 35. Component reference designations on the schematics at first may Component appear to be annotated in a somewhat haphazard manner.
  • Page 25 figure for the demodulated baseband signal. The output of FM detector chip IC33 is buffered by emitter-follower Q12. IC34B imparts additional broadband gain to the composite-baseband Overmodulation signal. Gain of this stage is set by R187. Diodes CR29 and CR30 are Clipper biased to a figure equivalent to ±100kHz carrier deviation, or about 130% modulation.
  • Page 26 This upsets the bias level of the blending circuitry and prevents its operation. European 50-microsecond and U.S. 75-microsecond de-emphasis De-Emphasis, characteristics are both supported by the Model 630. The appropriate Filtering and characteristic is selected by circuit-board jumpering; this procedure is Stereo Program covered on Page 9 under Installation and Connection.
  • Page 27 AUDIO LOSS AND MULTIPATH ALARMS (Schematic Sheet 2) The composite-baseband signal is fed to IC30A. This amplifier stage Audio Loss includes a first-order band-pass filter to isolate the L+R (mono) Alarm program audio component. The band-pass characteristic favors frequencies in the voice range, eliminating most non-legitimate program components.
  • Page 28 POWER SUPPLIES (Schematic Sheet 1) Most of the Model 630 Receiver circuitry operates from a bipolar 9-volt supply. The positive and negative supplies are regulated by linear “three-terminal” IC voltage regulators: IC4 for the +9-volt supply, IC6 for the –9-volt supply.
  • Page 29 Section VI APPENDIX The following section of this Manual contains a copy of the Frequency Programming Chart for the Inovonics 630 Relay Receiver, Parts Lists, Schematic Diagrams of all electronic circuitry, and an explanation of Inovonics’ Warranty Policy. — —...
  • Page 30 FM channel between 87.9MHz and 108.1MHz. This chart also appears on the inside of the top cover of the Model 630. See the instructions for frequency programming on Pages 8 and 9. Freq. . A B C D E F G H I J K 87.9...
  • Page 31 Freq . A B C D E F G H I J K Freq . A B C D E F G H I J K Freq . A B C D E F G H I J K 97.0 0 1 0 1 0 0 1 1 1 1 0 101.0 0 1 0 0 0 1 0 1 1 1 0 105.0 0 1 0 1 1 1 1 0 1 1 0...

  • Page 32: 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 630 is the “minibox” package with a lead spacing of 0.2 inch. Preferred mfgr.: Wima MKS-2 or FKC-2 series.
  • Page 33 10-Segment LED-bar display module, green; Kingbright DC-10GWA BAR3 10-segment LED-bar display module, yellow; Kingbright DC-10YWA — Right-angle socket for BAR1-3 (630 requires two, 14-pin and two, 16- pin.); Circuit Assembly Corp. CA-14SE-10RAC3-01 (14-pin), CA-16SE-10RAC3-01 (16-pin) — Pin-strip sockets for BAR1-3; E-CAM 250-1-2510-1208 (630 requires...
  • Page 34 Any semiconductor, IC, capacitor, resistor or connector used in the Model 630 is probably available from one or more of these firms. Each supplier publishes a full-line catalog available free for the asking.

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