Motorola 6816101H01-A service manual Subtone Level 42 ± 0.02kHz 96 ± 0.02kHz

3-6 Hardware Tuning Setup and Procedure

2.3.5Maximum Modulation

1.Set the radio to the appropriate tuning frequency (refer to Table 3-1).

2.On the test equipment, set the following configurations:

Audio bandwidth: 0.25Hz to 15,000Hz

De-emphasis: Off

FM: Peak negative

3.Using the Audio Analyzer, input a 1kHz tone + 67Hz subtone, 120mV to the radio through the test box.

4.Key up the radio.

5.Using the ceramic tool, adjust R159 to tune maximum modulation between 2.4 ± 0.02KHz for narrow band or under 5KHz for wide band (refer to Figure 3-3).

2.3.6Subtone Modulation

1.Set the radio to the appropriate tuning frequency (refer to table3-1).

2.On the test equipment set the following configuration

Audio bandwidth: 0.25Hz to 15,000Hz

De-emphasis: Off

FM: Peak negative

3.Program radio subtone to 67Hz (CTCSS).

4.Key up the radio.

Table 3-2 Subtone Modulation Configurations

Band	U1, U2	V1, V2
Subtone Level	0.42 ± 0.02kHz	0.96 ± 0.02kHz

5.Using the ceramic tool, adjust R172 to tune subtone modulation to the configurations in Table 3-2.

2.4Receiver Tuning

2.4.1Wide Band Sinad Tuning

1.Set the radio to the appropriate tuning frequency (refer to Table 3-1).

2.Set RF Signal Generator level to -47dBm at 1 kHz tone, 60% of the deviation.

3.Find the SINAD level 7 of the radio to decrease RF Signal Generator level.

4.Using the ceramic tool, adjust R215 clockwise to off the audio output.

5.Then adjust R215 counterclockwise at the point where the Audio Frequency signal appears (refer to Figure 3-2).

2.4.2Narrow Band Sinad Tuning

1.Set the radio to the appropriate tuning frequency (refer to Table 3-1).

2.Set RF Signal Generator level to -47dBm at 1 kHz tone, 60% of the deviation.

3.Find the SINAD level 7 of the radio to decrease RF Signal Generator level.

4.Using the ceramic tool, adjust R216 clockwise to off the audio output (refer to Figure 3-2).