Radio Alignment Procedures: Transmitter Alignment Options

5-5

 

 

Compensation alignment balances the modulation sensitivity of the VCO and reference modulation (synthesizer low frequency port) lines. The compensation algorithm is critical to the operation of signaling schemes that have very low frequency components (Digital Private-Line) and could result in distorted waveforms if improperly adjusted. To perform Modulation Balance tuning, follow the following steps.

1.Under the Tx Align menu, select Mod Balance Attn (Figure 5-4).

2.Begin with the lowest frequency (i.e. the first frequency point from the top). Pressing PTT Toggle without selecting any slider control at the corresponding frequency point will key the radio up at the first frequency point.

3.Inject 80 Hz at an amplitude of 1.78 V.

4.Record the deviation obtained. Typical values should range from [(1.70-2.30 kHz. Modulation is only tuned in the 25 kHz channel spacing mode.

5.Inject 3 kHz. Set the amplitude to 1.5 V.

6.Change the modulation balance attenuation setting until the Tx deviation is as recorded in step 4.

7.Inject 80 Hz at an amplitude of 1.78 V.

8.Check the deviation again. If the Tx deviation changes, record the reading and repeat steps 5-8 until the Tx deviation remains the same.

9.Press PTT Toggle to dekey the radio. Choose the next frequency, key up and repeat steps 3 to 8 until all seven tuning points are done.

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

11.Exit the Modulation Balance Function.

5.4.3Transmit Power Tuning

Note: The maximum available power level given in the table below must not be exceeded. There are separate alignment procedures for High and Low power.

Note: When checking the RF power output of the radio with a test set, always use a pad of

at least 30 dB attached to the radio end of the RF cable. This will avoid an RF mismatch and ensure a stable RF reading that will not change with varying lengths of connecting cable

Figure 5-5. Transmit Power Window (High Power)

HKLN4215A

December 3, 2003

Page 34
Image 34
Motorola EP450 service manual Transmit Power Tuning, Transmit Power Window High Power

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.