RX Tone Demodulation Characteristics | Midland Radio SP-300 specification

MAXON

SP-300 HAND HELD

RX TONE DEMODULATION CHARACTERISTICS

SUBAUDIO TONES - CTCSS

Tone Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Hz to 250.3 Hz Non-Standard Tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Hz to 260 Hz

Due to continuing research and development the company reserves the right to alter these specifications without prior notice.

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May 2001

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Midland Radio SP-300 service manual RX Tone Demodulation Characteristics

Contents

Service Manual Table of Contents Board Layout Exploded View Current Consumption SpecificationsTemperature Range General Frequency Bands DimensionsWeight Adjacent Channel Power Peak Deviation @ 1 kHz Nom. Dev +20dB Receiver RX Tone Demodulation Characteristics SP-300INTRODUCTION Features Busy Channel Lockout VCO Lock Time Description Description of Controls Digital Circuits Theory of Operation RF Circuits RF Circuits PLL Synthesizer Speaker Audio Amplifier Squelch mute CircuitKHz Band Pass Filter Noise Detector To replace the belt clip Maintenance and RepairRemoving & Replacing the Belt Clip Removing the belt clip To remove the PTT assembly Removing & Replacing the BatteryTo remove the battery To replace the battery Removing & Replacing the Antenna & Control Knobs Removing & Replacing the ACCES- Sory Connector To remove the Back Cover Removing & Replacing the Back CoverTo replace the Back Cover To remove the Main Board Removing & Replacing the Main Board To replace the Main Board Removing & Replacing the DAUGH- TER Boards Component ReplacementRemoving & Replacing the Speaker Surface Mounted Integrated Circuit Replacement Surface Mount Component Replacement Programming Alignment ProcedureCloning RX VCO S.G. @ 1kHz Audio Test Equipment Setup TP1 Alignment Points Diagram Symptoms Causes Counter Measures Troubleshooting Guide Main Circuit Voltage Charts Receive State Transmit State REF# Description PART# SP-300 Series UHF & VHF Digital Section Parts List -30- May REF # Description Replacement Modules SP-300 Series VHF RF Section Parts List -32- May -33- May SP-300 Series UHF RF Section Parts List -35- May -36- May -37- May KTA1504SY Component Pinout -39- May Base Diagram PIN Description UHF FRONT-END VHF Power AMPUHF Power AMP VHF FRONT-END UHF V.C.O VHF V.C.O Tcxo ACC-200 BatteryFuse SP-300 Series VHF RF Schematic UHF RF Schematic -47- May Board Layout Top Main Board Assembly 416121B -49- May