Motorola EP450 service manual Modulation Balance Attenuation

5-4 Radio Alignment Procedures: Transmitter Alignment Options

1.Under Tx Align menu, select Reference Oscillator Warp (Figure 5-3).

2.There is only 1 frequency point shown which is always the last non-0 transmit frequency point, which will normally be F7.

3.Click on the slider thumb and press PTT Toggle to key up the radio at the corresponding fre- quency point.

4.Monitor the transmit frequency.

5.Adjust the slider, spin or edit control (press ENTER to confirm selection/send a softpot value) until the frequency is as close as possible to the indicated transmit frequency. (Refer to Table 5-2).

6.Dekey the radio by pressing PTT Toggle.

7.Program the warp value into the radio by pressing the Program button.

8.Exit the Reference Oscillator Warp function.

Table 5-2. Reference Oscillator Specifications

RF Band	Target
VHF (146-174)	±174 Hz
UHF Band 1 (403-440)	±440 Hz
UHF Band 2 (438-470)	±470 Hz
UHF Band 3 (465-495)	±495 Hz

5.4.2Modulation Balance Attenuation

Note: When using test box RLN4460:

•Inject the signal into the radio via the METER IN terminal and

•Set the METER IN selector switch to “VOL”.

•Inject the signal into the radio via the AUDIO IN terminal.

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

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

Figure 5-4. Modulation Balance Window

December 3, 2003 HKLN4215A