Related Manuals for FM Systems FMR622S
Summary of Contents for FM Systems FMR622S
- Page 1 FMR622S DUAL NARROW BAND SLIDING DE-EMPHASIS DEMODULATOR INSTRUCTION BOOK IB 1222-22...
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Page 2: Table Of Contents
TABLE OF CONTENTS SECTION INTRODUCTION INSTALLATION & OPERATING INSTRUCTIONS SPECIFICATIONS FUNCTIONAL DESCRIPTION MAINTENANCE TUNING PROCEDURES COMPONENET LOCATOR APPENDIX B... -
Page 3: Introduction
INSTALLATION AND OPERATING INSTRUCTIONS: Remove the unit from its shipping container and inspect for shipping damage. The FMR622S is usually shipped already mounted in a PMS610 panel (1-¾” high x 19” standard rack width). The FMR622S is mounted in a PMS610 mainframe power... -
Page 4: Specifications
-24 VDC @ 120 mA (PMS610) SIZE & MOUNTING: This unit requires 1/3 FM Systems, PMS610 mainframe power supply, which fits into a standard 19” wide rack with 17 13/16” between mounting rails, 1 ¾” high, 10 ¼” deep. The other 2 spaces in the PMS610 accommodates additional FM Systems 600 series modules. - Page 5 INPUT Q1: The subcarrier input band pass filter consists of C101-107 and L101-104, which may be tuned to any subcarrier frequency. Transistor Q1 couples the output of the filter to the relatively low input impedance of the limiter in U1. LIMITER AND DEMODULATOR, U1: U1, with associated external components, is a complete signal limiter and demodulator, with automatic fine tuning and adjustable squelch with indicator LED.
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Page 6: Maintenance
In order to avoid degrading the overall performance, do not adjust any control in the FMR622S “By ear”. In the event of a malfunction of the unit, please contact the factory. We will generally recommend that the unit be sent to the factory for repair and recalibration. - Page 7 Measure the THD of the audio oscillator FM generator combination. It should be less than 0.5%, if not, do not attempt to reduce the FMR622S demodulator distortion, as the adjustment may add distortion in an attempt to cancel that of the test equipment.
- Page 8 APPENDIX B PMS610 MAINFRAME AND POWER SUPPLY INSTRUCTIONS The PMS610 is a mainframe power supply for mounting FM SYSTEMS 600 series equipment. Up to three circuit board modules may be accommodated. These 600 series modules may be readily installed in the field with common hand tools, no soldering is required.
- Page 9 TO INSTALL AN ADDITIONAL MODULE: Select which of the three positions that will be occupied by the new circuit board module. Remove the mainframe from the rack and disconnect the power. Remove the bottom cover, and the #4-40 x ¼” mounting studs adjacent to the new modules location from the mainframe.
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Page 10: Componenet Locator
CAUTION: Most circuit board modules have several adjustments which are carefully factory set with precision instruments for optimum performance. Change only those which must be adjusted, some controls when mis-adjusted produce little change under normal operating conditions, but can seriously reduce the ability of the unit to function correctly under other conditions which may be encountered.