Assembly Adjusted
Al5 RF Assembly
Related Performance Test
IF Input Amplitude Accuracy
Description
The gain of the Second IF (between A15J801 INT Second IF and the third mixer) is set to
12dB.
Note | This adjustment is necessary after replacing either A15Al Second IF Amplifier |
| or A15U802 Second IF pad. |
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Equipment
No test equipment or test setup is required for this adjustment procedure.
Procedure
1.Set the HP 8560A m switch off, disconnect the power cord, and remove the analyzer cover. Fold down the Al5 RF and Al4 Frequency Control assemblies. Prop up the Al4 Frequency Control assembly.
2.Remove the shield covering the third converter and A15Al Second IF Amplifier. See Figure 2- 19.
3.Read the gain printed on the A15Al Second IF Amplifier label. Select a value for A15U802 from Table
4.Reinstall the shield on the Al5 assembly.
5.Perform the External Mixer Amplitude Adjustment.
Note | If the second IF input switch is repaired, there might be insufficient range in |
| the External Mixer Amplitude Adjustment. If this is the case, select a new |
| value for A15U802. Greater attenuation values of U802 will lower the signal |
| amplitude, and lower attenuation values will increase the signal amplitude. |
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