Maxon Telecom SM-2000 RX Tone Demodulation Characteristics, Subaudible tones CTCSS/DCS

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MAXON SM-2000 MOBILE

SPECIFICATIONS

AF power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 W maximum @10% Distortion into a 4 ohm load. 4 Watts nominal.

AF frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Method as FTZ 17 TR 2049 July 1988

MOD Type G3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Within +1/-3 dB of 6 dB/octave

de-emphasis curve

300 Hz – 2.55 kHz for 12.5 kHz Channel Spacing

300 Hz – 3 kHz for 25 kHz Channel Spacing

MOD Type F3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Within +1/-3 dB of 6 dB/octave

de-emphasis curve

300 Hz – 2.55 kHz for 12.5 kHz Channel Spacing

300 Hz – 3 kHz for 25 kHz Channel Spacing

RX Hum & Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . > 40 dB

RX TONE DEMODULATION CHARACTERISTICS

Subaudible tones - CTCSS/DCS

CTCSS tone range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Hz to 250 Hz CTCSS tone standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RS-220A EIA Standard CTCSS non-standard tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 – 260 Hz

DCS tone standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Standard and inverted

Decode Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Method: Decrease signal level @ 10% peak deviation

All tone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <= 9 dB SINAD

Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IEC529 level IP54 MIL STD 810C

EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EMC Directive 89/336/EEC May 1989 ETS 300.279

ACCESSORIES

MA4472 Microphone

RELIABILITY ANALYSIS

Calculation method

MTBF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15,000 Hr. MIL-HDBK-217F. Ground

benign. Parts stress method.

MTTR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Min. (Average time to rework any SMD component & reassemble).

PROGRAMMER

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SMP4004C

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December 98

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Contents SM-2000 Page Maxon SM-2000 Mobile Table of ContentsSchematics and Block Diagrams PCB LayoutsSM-2000 Exploded View Specifications Transceiver Nominal PerformanceGeneral Operational Bandwidth BandTransmitter Specfications TX Tone Modulation Characteristics SUB Audible Tones DCSReceiver Accessories RX Tone Demodulation CharacteristicsSubaudible tones CTCSS/DCS Reliability AnalysisIntroduction Check the carton carefully for the following items Unpacking InformationGeneral Description Description of Controls Description of ControlsSM-2000 Rear Panel Digital Circuitry Theory of OperationCTCSS/DCS Decode Circuits CTCSS/DCS Encoder CircuitEeprom PLL RF Section SM-2150/VHF TX VCO RX VCOPrescaler Out of Lock DetectorReceiver RF AmplifierLow Pass Filter Receiver Audio CircuitAudio Amplifier Noise Detect Circuit SQ BoardRF Section SM-2450/UHF UHF TransmitterFrequency Synthesizer Circuit Voltage Controlled Oscillator Circuit First MixerSecond Oscillator- Mixer- Limiter and FM Detector Squelch Noise Band Pass Filter Squelch Mute CircuitNoise Detector Speaker Audio AmplifierTransmit Tests Test SetupPLL Alignment SM-2150/VHF Alignment ProcedureReceiver Alignment RF Discriminator TuningAutomatic Power Adjustment Squelch AdjustmentModulation Deviation Adjustment CTCSS/DCS Deviation AdjustmentAlignment Points Diagram SM-2150/VHF SM-2450/UHF Alignment Procedure Page-28 December ∙ Note Release the PTT button when changing channels Page-30 December Alignment Points Diagram SM-2450/UHF Component Replacement Surface Mount ComponentsSurface Mount Removal Surface Mounted Integrated Circuit Replacement Surface Mount Component ReplacementREF # Description Parts List Common to SM-2000Digital Parts Common on Both VHF & UHF Digital Section REF # Description FRONT-END PCB Assembly Main Board Parts Band ChartPage-38 December Page-39 December Page-40 December Page-41 December SM-2450A UHF Band SM-2450C UHF Band SM-2450D UHF Band SM-2450E UHF Band Band ChartPage-44 December Page-45 December Page-46 December Page-47 December Component Pinout Page-49 December Page-50 December IC409 Voltage Charts SM-2150/VHFPage-52 December Transistor Voltage Chart Voltage Charts SM-2450/UHF IC404 Page-56 December Status Indications & Audible Tones Trouble Shooting Chart SM-2000Page-58 December MMBV109 Replacement Module SchematicsMA-4472 Microphone Schematic Page-61- December Page-62- December Page-63- December Page-64- December SM-2000 Control Head SW5Page-66 December SM-2150/VHF Main Board AssyFront SM-2450/UHF Main Board AssySM-2000 SM-2150/VHF Exploded View Parts List Intentionally Left Blank