Motorola EP450 service manual VCO Attenuation 25 kHz, When using test box RLN4460

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Radio Alignment Procedures: Transmitter Alignment Options

5-7

 

 

5.4.4VCO Attenuation

Note: Modulation Balance Tuning must be done first. The Transmit Deviation Limit softpot sets the maximum deviation of the carrier. Tuning is performed for all (12.5 kHz, 20 kHz and 25 kHz) channel bandwidths. Tuning for 25 kHz channels must be done first for all frequency points. Tuning for 12.5 and 20 kHz channels determines only the off- set to the previously tuned deviation for 25 kHz tuning channel spacing. For 12.5, and 20kHz channels, only the last non-0 transmit frequency point (normally F7) is used for tuning. The 30 kHz channel bandwidths that use 5.0 kHz maximum system devia- tion are covered by the 25 kHz tuning.

When using test box RLN4460:

•Set the METER OUT toggle switch to the “MIC PORT” position

•Set the METER OUT selector switch to “MIC”.

•Inject a 1 kHz tone with the levels given below for each radio model to AUDIO IN.

•Measure the level at the radio input at the AC/DC meter.

Figure 5-6. VCO Attenuation Window (12.5 kHz)

5.4.4.1VCO Attenuation 25 kHz

1.Under the Tx Align menu, select VCO Attenuation 25 kHz (Figure 5-6).

2.Begin with the lowest frequency. Select the thumb of the slider at the lowest frequency point and then press the PTT Toggle button to key up the radio at the corresponding frequency point. The spin control can also be toggled via its up/down arrow buttons. The softpot value can also be typed into the edit control (press ENTER to confirm your selection/send a softpot value).

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.Dekey the radio (Press the PTT Toggle button). Choose the next frequency, key up and repeat steps 3 to 6 until all seven tuning points are done.

HKLN4215A

December 3, 2003

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Contents EP450 HKLN4215A Product Safety and RF Exposure Compliance ForewordComputer Software Copyrights Document CopyrightsTable of Contents Display Model Disassembly and Re-assembly Appendix a Accessories Troubleshooting TablesList of Figures 13. Microphone and Speaker Wires Re-assembly List of Tables Related PublicationsModel Charts and Test Specifications Radio Model InformationModel Chart for VHF 146-174 MHz EP450, VHF, 146-174 MHz Model DescriptionVHF Test Specifications GeneralTransmitter 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 UHF Test Specifications LAH65SDH9AA4NMIL Standards MIL-STDTheory Of Operation IntroductionMajor Assemblies If IC Test Equipment, Service Aids, and Service Tools Motorola Part No Description Characteristics ApplicationTest Equipment Service Aids Motorola Part Description ApplicationTest Equipment, Service Aids, and Service Tools Service Aids Programming/Test Cable 5mmPower-Up Self Test Performance ChecksGeneral RF Test Mode Service Monitor Test Set Power SupplyNo. Description Function Beeps No. of BKCVHF R2 UHF R1 UHF R2 UHF R3 Test Mode Test Name Communications Analyzer Radio Test Set CommentsPerformance Checks RF Test Mode Radio Alignment Procedures CPS Programming SetupRadio Tuning Setup Initial Test Equipment Control Settings Transmitter Alignment OptionsReference Oscillator Warp Modulation Balance Attenuation Under Tx Align menu, select Reference Oscillator Warp FigureTransmit Power Tuning Transmit Power Window High PowerTo Perform Transmit High Power Tuning, do the following To Perform Transmit Low Power Tuning, do the followingWhen using test box RLN4460 VCO AttenuationVCO Attenuation 25 kHz VCO Attenuation 12.5 kHz VCO Attenuation 20 kHzUnder the Tx Align menu, select VCO Attenuation 12.5 kHz Under the Tx Align menu, select VCO Attenuation 20 kHzDtmf Deviation Tuning Under Tx Align, select Dtmf Deviation FigureReceiver Tuning MDC-1200 Deviation TuningUnder the Tx Align, select MDC-1200 Signaling Figure Rated Volume Tuning Perform the rated volume tuning procedure as followsSquelch Tuning Manual Squelch TuningRssi System Level Tuning Auto TuneRssi Display Tuning Under the Rx Align menu, select Rssi Display TuningUtilities Radio-to-Radio CloningProcedure 12. Side Button LocationsRadio Alignment Procedures Radio-to-Radio Cloning Display Model Disassembly and Re-assembly Preventive MaintenanceCleaning Procedures Cleaning External Plastic SurfacesCleaning Internal Circuit Boards and Components Safe Handling of Cmos and Ldmos DevicesRadio Disassembly Detailed Front Cover From Chassis DisassemblyDisassembling and Re-assembling the Radio General Antenna and Knob Removal Keyboard Flex Connection Dust Cover Disassembly Speaker and Microphone DisassemblyPTT Disassembly Keyboard RemovalChassis Disassembly Audio jack shroud can be removed from the main boardRadio Re-assembly Detailed Dust Cover Re-assemblyMicrophone and Speaker Re-assembly 12. Microphone Re-assembly Keypad and LCD/Keyboard Re-assembly 14. Keypad Re-assemblyKeyboard Retainer Re-assembly Chassis Assembly/Re-assemblyChassis and Front Cover Re-assembly 17. Main Board onto Chassis Re-assembly18. Microphone and Speaker Wires Re-assembly PTT Re-assembly 20. Fastening the ChassisMechanical View and Parts List 1 EP450 Display Exploded View and Parts ListMotorola Part Description Number MotorolaDecember 3 Non-Display Model Disassembly and Re-assembly Safe 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 Chassis Disassembly Removal of Main Board from ChassisDust 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 1 EP450 Non-Display Exploded View and Parts List 16. EP450 Non-Display Radio Exploded View14Mechanical View and Parts List Troubleshooting Tables Power-Up Error CodesOperational Error Codes Error Code Possible Causes Corrective ActionTroubleshooting Table for Receiver Troubleshooting Table for Transmitter Troubleshooting Tables Troubleshooting Table for Transmitter Appendix a Accessories Carrying AccessoriesAntennas ChargersAudio Accessories HeadsetsRemote Speaker Microphones ManualsAccessories Appendix B Warranty, Service Support, and Replacement Parts WarrantyReplacement Parts Ordering Scope of ManualMotorola Online Mail OrdersTelephone Orders Fax OrdersMotorola de Colombia Service Center Motorola de Mexico Service CenterTechnical Support Appendix B-4 Glossary of Terms Term DefinitionReset

EP450 specifications

The Motorola EP450 is a robust and reliable two-way radio that has made a significant impact in the world of professional communications. Known for its solid construction and exceptional performance, the EP450 is a popular choice among various industries, including security, transportation, and event management.

One of the standout features of the Motorola EP450 is its impressive audio quality. Equipped with advanced audio processing technologies, the radio offers clear and crisp sound, ensuring effective communication even in noisy environments. This feature is particularly beneficial for users who work in fields where situational awareness and timely communication are crucial.

The EP450 operates on both VHF and UHF frequency bands, making it versatile for various communication needs. With 16 channels and a wide frequency range, users can easily switch between channels to avoid interference and ensure secure communications. Additionally, the radio offers a programmable feature, allowing users to customize button functions and settings, which enhances the overall user experience.

The battery life of the EP450 is another notable characteristic. It comes powered with a long-lasting rechargeable battery that provides extended usage on a single charge. This ensures that users can rely on the device throughout their shifts without concerns about running out of power. Furthermore, the EP450 features a battery save mode that helps conserve energy when the radio is not in use.

In terms of design, the Motorola EP450 is built to withstand tough environments. Its rugged housing is dustproof and can withstand exposure to water, making it suitable for outdoor use. Additionally, the radio's user-friendly interface includes a large display and oversized buttons, allowing users to operate it easily even with gloves or in challenging conditions.

Furthermore, the EP450 supports various accessories, such as headsets and external microphones, enhancing usability and flexibility in various operational scenarios. This adaptability allows users to customize their communication solutions based on specific needs.

In conclusion, the Motorola EP450 stands out for its superior audio quality, versatile frequency operation, long-lasting battery life, and rugged design. These features make it an indispensable tool for professionals who require reliable communication in demanding environments, proving its value across a multitude of industries.
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