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

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.

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