Maxon Telecom SM-2000 service manual Operational Bandwidth, Transmitter

Page 6

MAXON SM-2000 MOBILE

SPECIFICATIONS

Switching range TX and RX (without re-tuning)

 

 

 

Operational Bandwidth

 

 

 

 

 

 

 

BAND

 

TX

 

RX

 

 

 

 

 

 

 

 

MIN

 

MAX

MIN

 

MAX

 

 

 

 

 

 

 

VHF Band 1

136

 

162

136

 

162

 

 

 

 

 

 

 

VHF Band 2

148

 

174

148

 

174

 

 

 

 

 

 

 

 

 

 

 

 

 

 

UHF Band 1

400

 

430

400

 

430

 

 

 

 

 

 

 

UHF Band 2

420

 

450

420

 

450

 

 

 

 

 

 

 

UHF Band 3

440

 

470

440

 

470

 

 

 

 

 

 

 

UHF Band 4

470

 

490

470

 

490

 

 

 

 

 

 

 

UHF Band 5

490

 

512

490

 

512

 

 

 

 

 

 

 

Channel spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 kHz / 20 kHz / 12.5 kHz programmable

(25 kHz - 12.5kHz switchable by CPU control)

Dimensions (in / mm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2(H) x 7(W) x 6.25(D) 45(H) x 157(W) x 140(D)

Weight

3lbs, 6oz/ 1.6kg (with mic)

TRANSMITTER

Tests methods are ETS 300 086 Jan 1991 unless stated

Performance Without Sub audible Modulation

Carrier Power @ nominal conditions

Max. Rated Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 W +/-10% nominal

25 W +2/-3 dB @ extreme conditions across switching range

Hi Switched by CPU

1

– 25 W

Continuously adjustable

 

 

Low Switched by CPU

1

– 3 W

Continuously adjustable

 

 

Frequency stability (SM-2150)

+5.0 ppm (+ 0.00025%)

Frequency stability (SM-2450)

+2.5 ppm (+ 0.00025%)

Peak audio frequency deviation (across switching range)

Page-2-

December 98

Image 6
Contents SM-2000 Page Table of Contents Maxon SM-2000 MobileSchematics and Block Diagrams PCB LayoutsSM-2000 Exploded View Specifications Transceiver Nominal PerformanceGeneral Operational Bandwidth BandTransmitter Specfications TX Tone Modulation Characteristics SUB Audible Tones DCSReceiver Subaudible tones CTCSS/DCS RX Tone Demodulation CharacteristicsAccessories Reliability AnalysisIntroduction Unpacking Information Check the carton carefully for the following itemsGeneral Description Description of Controls Description of ControlsSM-2000 Rear Panel CTCSS/DCS Decode Circuits Theory of OperationDigital Circuitry CTCSS/DCS Encoder CircuitEeprom PLL RF Section SM-2150/VHF RX VCO TX VCOReceiver Out of Lock DetectorPrescaler RF AmplifierAudio Amplifier Receiver Audio CircuitLow Pass Filter 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 Noise Detector Squelch Mute CircuitSquelch Noise Band Pass Filter Speaker Audio AmplifierTest Setup Transmit TestsSM-2150/VHF Alignment Procedure PLL AlignmentDiscriminator Tuning Receiver Alignment RFSquelch Adjustment Automatic Power AdjustmentCTCSS/DCS Deviation Adjustment Modulation 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 Mount Component Replacement Surface Mounted Integrated Circuit ReplacementParts List Common to SM-2000 REF # DescriptionDigital Parts Common on Both VHF & UHF Digital Section Band Chart REF # Description FRONT-END PCB Assembly Main Board PartsPage-38 December Page-39 December Page-40 December Page-41 December SM-2450A UHF Band SM-2450C UHF Band SM-2450D UHF Band Band Chart SM-2450E UHF BandPage-44 December Page-45 December Page-46 December Page-47 December Component Pinout Page-49 December Page-50 December Voltage Charts SM-2150/VHF IC409Page-52 December Transistor Voltage Chart Voltage Charts SM-2450/UHF IC404 Page-56 December Trouble Shooting Chart SM-2000 Status Indications & Audible TonesPage-58 December Replacement Module Schematics MMBV109MA-4472 Microphone Schematic Page-61- December Page-62- December Page-63- December Page-64- December SW5 SM-2000 Control HeadSM-2150/VHF Main Board Assy Page-66 DecemberSM-2450/UHF Main Board Assy FrontSM-2000 SM-2150/VHF Exploded View Parts List Intentionally Left Blank