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Motorola EP450 service manual VCO Attenuation 12.5 kHz, VCO Attenuation 20 kHz

Models: EP450

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5-8	Radio Alignment Procedures: Transmitter Alignment Options

7.Program the softpot value by pressing the Program button.

8.Exit the VCO Attn. 25 kHz function.

5.4.4.2VCO Attenuation 12.5 kHz

Note: Tuning of Modulation Balance Attenuation and VCO Attenuation for 25 kHz channel bandwidth must be done first.

1.Under the Tx Align menu, select VCO Attenuation 12.5 kHz.

2.Press PTT Toggle to key up the radio at the last non-0 transmit frequency point (normally F7).

3.Inject 1 kHz at an appropriate level until 2.3 V rms is measured at the AC/DC METER (radio input) if using test box RLN4460.

4.Record the deviation obtained.

5.Adjust the slider, adjust the spin control or key in softpot values (press ENTER to confirm) for the frequency point until the deviation is within the range specified in Table 5-4.

6.Press PTT Toggle to dekey the radio.

7.Program the softpot value by pressing the Program button.

8.Exit the VCO Attenuation 12.5 kHz function.

5.4.4.3VCO Attenuation 20 kHz

Note: Tuning of Modulation Balance Attn. and VCO Attn. for 25 kHz channel bandwidth must be done first.

1.Under the Tx Align menu, select VCO Attenuation 20 kHz.

2.Press PTT Toggle to key up the radio at the last non-0 transmit frequency point (normally F7).

3.Inject 1 kHz: at an appropriate level until 2.3V rms is measured at the AC/DC METER (radio input) if using test box RLN4460.

4.Record the deviation obtained.

5.Adjust the slider; adjust the spin control or key in softpot values (press ENTER to confirm) for the frequency point until the deviation is within the range specified in Table 5-4.

6.Press PTT Toggle to dekey the radio.

7.Program the softpot value by pressing the Program button.

8.Exit the VCO Attn. 20 kHz function.

Table 5-4. Deviation Specifications

Band	Channel Spacing	Deviation (kHz)

UHF/VHF	25 kHz	4.40 - 4.60

UHF/VHF	12.5 kHz	2.20 - 2.30

UHF/VHF	20 kHz	3.40 - 3.60

December 3, 2003

HKLN4215A

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Motorola EP450 service manual VCO Attenuation 20 kHz, Under the Tx Align menu, select VCO Attenuation 12.5 kHz

Contents

EP450 HKLN4215A Foreword Product Safety and RF Exposure ComplianceComputer Software Copyrights Document CopyrightsTable of Contents Display Model Disassembly and Re-assembly Troubleshooting Tables Appendix a AccessoriesList of Figures 13. Microphone and Speaker Wires Re-assembly Related Publications List of TablesRadio Model Information Model Charts and Test SpecificationsModel Description Model Chart for VHF 146-174 MHz EP450, VHF, 146-174 MHzGeneral VHF Test SpecificationsTransmitter ReceiverModel Chart for UHF 403-440 MHz EP450, UHF, 403-440 MHz Model Chart for UHF 438-470 MHz EP450, UHF, 438-470 MHz Model Chart for UHF 465-495 MHz EP450, UHF, 465-495 MHz LAH65SDH9AA4N UHF Test SpecificationsMIL-STD MIL StandardsIntroduction Theory Of OperationMajor Assemblies If IC Motorola Part No Description Characteristics Application Test Equipment, Service Aids, and Service ToolsTest Equipment Motorola Part Description Application Service AidsTest Equipment, Service Aids, and Service Tools Service Aids 5mm Programming/Test CablePerformance Checks Power-Up Self TestGeneral Service Monitor Test Set Power Supply RF Test ModeNo. of BKC No. Description Function BeepsVHF R2 UHF R1 UHF R2 UHF R3 Test Name Communications Analyzer Radio Test Set Comments Test ModePerformance Checks RF Test Mode CPS Programming Setup Radio Alignment ProceduresRadio Tuning Setup Radio Tuning SetupTransmitter Alignment Options Initial Test Equipment Control SettingsReference Oscillator Warp Under Tx Align menu, select Reference Oscillator Warp Figure Modulation Balance AttenuationTransmit Power Window High Power Transmit Power TuningTo Perform Transmit Low Power Tuning, do the following To Perform Transmit High Power Tuning, do the followingVCO Attenuation When using test box RLN4460VCO Attenuation 25 kHz VCO Attenuation 20 kHz VCO Attenuation 12.5 kHzUnder the Tx Align menu, select VCO Attenuation 12.5 kHz Under the Tx Align menu, select VCO Attenuation 20 kHzUnder Tx Align, select Dtmf Deviation Figure Dtmf Deviation TuningMDC-1200 Deviation Tuning Receiver TuningUnder the Tx Align, select MDC-1200 Signaling Figure Perform the rated volume tuning procedure as follows Rated Volume TuningManual Squelch Tuning Squelch TuningAuto Tune Rssi System Level TuningUnder the Rx Align menu, select Rssi Display Tuning Rssi Display TuningUtilities Radio-to-Radio Cloning12. Side Button Locations ProcedureRadio Alignment Procedures Radio-to-Radio Cloning Preventive Maintenance Display Model Disassembly and Re-assemblyCleaning Procedures Cleaning External Plastic SurfacesSafe Handling of Cmos and Ldmos Devices Cleaning Internal Circuit Boards and ComponentsFront Cover From Chassis Disassembly Radio Disassembly DetailedDisassembling and Re-assembling the Radio General Antenna and Knob Removal Keyboard Flex Connection Speaker and Microphone Disassembly Dust Cover DisassemblyKeyboard Removal PTT DisassemblyAudio jack shroud can be removed from the main board Chassis DisassemblyDust Cover Re-assembly Radio Re-assembly DetailedMicrophone and Speaker Re-assembly 12. Microphone Re-assembly 14. Keypad Re-assembly Keypad and LCD/Keyboard Re-assemblyChassis Assembly/Re-assembly Keyboard Retainer Re-assembly17. Main Board onto Chassis Re-assembly Chassis and Front Cover Re-assembly18. Microphone and Speaker Wires Re-assembly 20. Fastening the Chassis PTT Re-assembly1 EP450 Display Exploded View and Parts List Mechanical View and Parts ListMotorola Motorola Part Description NumberDecember 3 Introduction Non-Display Model Disassembly and Re-assemblySafe Handling of Cmos and Ldmos Devices Disassembling and Re-assembling the Radio General Antenna and Knob Removal Speaker Connector Shroud Microphone Speaker and Microphone Disassembly Removal of Main Board from Chassis Chassis DisassemblyDust Cap Re-assembly 11. Speaker Re-assembly 12. Installation of Main Board onto Chassis 13. Microphone and Speaker Wires Re-assembly 15. PTT Re-assembly 16. EP450 Non-Display Radio Exploded View 1 EP450 Non-Display Exploded View and Parts List14Mechanical View and Parts List Power-Up Error Codes Troubleshooting TablesOperational Error Codes Error Code Possible Causes Corrective ActionTroubleshooting Table for Receiver Troubleshooting Table for Transmitter Troubleshooting Tables Troubleshooting Table for Transmitter Carrying Accessories Appendix a AccessoriesAntennas ChargersHeadsets Audio AccessoriesManuals Remote Speaker MicrophonesAccessories Warranty Appendix B Warranty, Service Support, and Replacement PartsReplacement Parts Ordering Scope of ManualMail Orders Motorola OnlineTelephone Orders Fax OrdersMotorola de Mexico Service Center Motorola de Colombia Service CenterTechnical Support Appendix B-4 Term Definition Glossary of TermsReset