Maxon Telecom SP200, SP210 Detailed Functional Description, Introduction, Common Circuits, Eeprom

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SP200/210

Maxon SP200/210 Radio

5 DETAILED FUNCTIONAL DESCRIPTION

5.1 Introduction

This section provides a detailed description of the operation of the radio.

5.2 Common Circuits

Power Circuits

Battery voltage, or external voltage through the accessories connector, is applied via a 4A fuse (plus diode protection) directly to the RF power module and, after the on/off switch, to the dc to dc converter and voltage regulator. The majority of the circuitry is powered via IC1, which regulates the +7.5V dc supply down to +5V.

Transistors Q2 and Q32, in conjunction with the Tx Enable and Rx Enable lines from the microcontroller, apply +5V Tx or +5V Rx to the relevant circuitry during receive or transmit. Thus, for instance, the receive front end amplifier is only powered during receive and the power control IC is only powered during transmit.

It is possible to program the radio for power saving. This mode causes the microcontroller to pulse the Rx Enable line high and low for periods between 100 and 300mS. The time may be selected when programming the radio. As soon as the radio detects a signal it switches into normal mode.

Microcontroller

The microcontroller (IC403) is a One Time Programmed Processor chip based on the Hitachi HD3837 processor with onboard ROM and RAM.

It controls all functions performed by the radio, in conjunction with control signals from push buttons, switches etc. It controls the data to/from the EEPROM and to the PLL IC, Audio ASIC as well as controlling external data from the programmer and alignment interface. The microcontroller generates the enable lines, controlling routing of signals and the indicators (LED,LCD and bleeps).

The microcontroller also generates and decodes the SAT tones (filtered by the ASIC).

EEPROM

Relevant channel information, such as Rx / Tx frequencies and CTCSS / DCS codes, is stored in the EEPROM (IC404) which is a X25330. This information may be programmed and erased via the accessories socket. Certain parameters can also be altered via the pushbuttons and keys on the radio, i.e. scan channels and priority channel. The EEPROM has 32768 (8x4096) capacity and data is written serially.

Channel Select Circuit

Up to 199 channels may be selected, using the channel keys on the front panel. Pressing the channel keys earths pins 40 and 41 of the microcontroller, so enabling the decoding for the appropriate Rx and Tx frequencies, and associated data, to be selected from the EEPROM.

Issue 1.0

DETAILED FUNCTIONAL DESCRIPTION

03/01

Page 5-1

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Contents SP200/210 NSW Australia Tel +61 0 2 9707 Amendment Record Sheet Issue No Effective Date Reason for Change SignatureAmendment Record Sheet Maxon SP200/210 Radio Table of Contents 11.4 Default Settings 11-8 SL100 UHF Parts List10-1 11-1List of Tables Maxon SP200/210 Radio Issue 03/01 Introduction Using this ManualAmendments to this Manual Category C Engineering BulletinContact Information General SpecificationsPhysical Dimensions Synthesiser Environmental Operating Temperature RangeVibration ESD EMCOptions Accessories & OptionsPre-Install Check Accessories Accessories & Options Installation INSTALLATION, Commissioning & AlignmentINSTALLATION, Commissioning & Alignment ConnectionsRecommended Test Equipment CommissioningCommissioning Kit Commissioning EquipmentDiscrete Test Equipment Test Equipment Set-up using Discrete Test EquipmentSK 3100 Service Kit Receiver Performance Tests Test Equipment ConnectionTransmitter Performance Tests Audio Output Power AdjustmentSquelch Alignment Tests without DisassemblyPreparation VHFRemoving and Replacing the Belt Clip Disassembly and Re-assembly of the RadioRemoving and Replacing Battery PLL Alignment Removing and Replacing the Main AssemblyLocation of Adjustment Points Tcxo Squelch SensitivityTransmitter Alignment Radiocommunications Test SET Ctcss / DCS deviation Balance AdjustmentAudio deviation adjustment Receiver Alignment Audio Volume LevelAt maximum volume, nominal distortion is 10% Introduction Detailed Functional DescriptionCommon Circuits EepromAudio Asic Audio Signal PathMiscellaneous Signals and Controller Sat Signal PathAudio/SAT Circuits LEDs and indicators Battery Low Indicator CircuitCommon RF Circuits PLL SynthesiserOut-of-Lock Detector PLL ICCharge Pump and Loop Filter DC to DC ConverterAutomatic power control APC circuits Antenna SwitchTransmitter PA moduleFront End ReceiverSecond mixer, Second IF, FM detector First MixerSquelch Mute Circuit 16kHz Band Pass FilterSpeaker Audio Amplifier Noise detector circuitAF Output Low Pass Filter Diagnostic Function TroubleshootingDiagnostics TroubleshootingIf IC Troubleshooting ChartMain Circuit Transistor Voltages Voltage ChartsTransistors Main Circuit Integrated Circuit Voltages Transmit Integrated CircuitsIntegrated Circuit Voltages Receive Troubleshooting Troubleshooting Troubleshooting Troubleshooting SMP6100 ProgrammingIntroduction Getting StartedScanning Select Features MenuProgram/Print/Save Program RadioSave Data to Disk Print DataMaxon SP200/200 Radio SP200/210 Parts List Exploded Mechanical Drawings & Parts ListsExploded Mechanical Drawings & Parts Lists Spare PartsSL100V2 SL100U2For details on servicing, please refer to Section Mechanical PartsLCD TTR 1866 Dpfdpw Parts List for Exploded Mechanical DrawingSKPT-110VA PCB LCDSML-020MLTT86 SMD NUT M7 BsbmPCB VCO PCB RF Bsbm M2.6 Aldc05B-000-5Z SL100 VHF Parts ListV2 Control Circuit Chip Ceramic 0.001UF GRM39 X7R102K 50V P Diode Switching KDS181S A3Chip Ceramic 0.012UF GRM39 X7R123K 25V P Chip Ceramic 0.0022UF GRM39 X7R222J 50V PSW Tact SKPT-1101VA 2 V2 RFRES.CHIP Trimmer 10K RH03E1C14X RES.CHIP Trimmer 1K RH03E1C13XThermistor Chip 33KNTCCS32163SH333KC TH1 Elect Capacitor 10UF 16V 20%Chip Ceramic 39PF GRM40 COG390J 50V P RE Power Module GNOK-M68776-E01 IC9Chip Ceramic 43PF GRM40 COG430J 50V P Chip Ceramic 47PF GRM39 COG470J 50V PTcxo Assembly 5 V2 Front End 4 V2 VCOU2 Control Circuit SL100 UHF Parts ListConnector Waffer Chip Resistor 12K 2 U2 RFChip Resistor 18K Chip Resistor 39KChip Ceramic 0.0015UF GRM39 X7R152K 50V P RES.CHIP Trimmer K RH03E1C13XChip Ceramic 10PF GRM40 COG100C 50V P Chip CeramicChip Ceramic 2.2PF GRM40 COG2R2C 50V P Power Mpduleuhf M68732HGNOK IC9Chip Ceramic 470PF GRM40 COG471J 50V P Chip Ceramic 4.7PF GRM40 COG4R7C 50V PCoil Chip 18NHLL2012-F18NM TcxoCoil Spring X0.35X7TR Coil Spring 2X0.75X3TL SMD4 VCO Maxon SP200/210 Radio Circuit Diagrams & PCB Layouts Circuit Diagrams & PCB LayoutsRF PCB TcxoCircuit Diagrams & PCB Layouts Digital Board Layout Top Side Digital Board Layout Bottom Side RF Board Layout Top Side Issue RF Board Layout Bottom Side P406787a Front End Front-End Board Layout Tcxo Board Layout 10.1Spare Parts Spare Parts & Maintenance Policy10SPARE Parts Surface mount component replacement Component ReplacementSurface mount components Surface mount removalSurface mounted integrated circuit replacement Spare Parts & Maintenance Policy 11.1Purpose 11APPENDIX ACC-2003 Alignment BOX11.2Test Equipment 11.3Calibration ProgramAppendix a ACC-2003 Alignment BOX Calibration Program Primary ScreenAsic Control Screen Rx TXTRIM3 Adjustment of Asic valuesTXTRIM2 RX VOL SAT Deviation Transmit AdjustmentsSAT Balance Audio Output Level Receive Adjustments11.4.1 V1 Band Default Settings 11.4Default SettingsV1 Default Frequency Table V1 Default Asic SettingsV2 Default Asic Settings 11.4.2 V2 Band Default SettingsV2 Default Frequency Table U1 Default Asic Settings 11.4.3 U1 Band Default SettingsU1 Default Frequency Table U2 Default Asic Settings 11.4.4 U2 Band Default SettingsU2 Default Frequency Table
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