Motorola EP450

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December 3, 2003 HKLN4215A
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.
5.4.4.2 VCO Attenuation 12.5 kHz
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.
5.4.4.3 VCO Attenuation 20 kHz
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
Note:
Tuning of Modulation Balance Attenuation and VCO Attenuation for 25 kHz channel
bandwidth must be done first.
Note:
Tuning of Modulation Balance Attn. and VCO Attn. for 25 kHz channel bandwidth
must be done first.
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