9. Tracking Generator Power Level Adjustments

Assembly Adjusted

A10 Tracking Generator Assembly

Related Performance Test

Absolute Amplitude and Vernier Accuracy

Description

The A10 Tracking Generator has two adjustments for setting the output power. AlOR

-10 dB ADJ sets the power level when the TRK GEN RF POWER is set to -10 dBm and AlOR 0 dB ADJ sets the power level when the TRK GEN RF POWER is set to 0 dBm. The -10 dB ADJ acts as an offset adjustment while 0 dB ADJ acts as a gain adjustment.

These adjustments are set in the factory for a 10 dB difference in output power between the -10 dBm and 0 dBm TRK GEN RF POWER settings. When installing a replacement tracking generator, it should only be necessary to adjust -10 dB ADJ (the offset adjustment) to account for variations in cable loss from the tracking generator to the RF OUT 50 R connector. This adjustment is done at a 0 dBm TRK GEN RF POWER setting. This ensures that the absolute power level with a 0 dBm TRK GEN RF POWER setting is 0 dBm with little effect, if any, on the vernier accuracy.

In some cases, the power level at the -10 dBm TRK GEN RF POWER setting might be out of tolerance. In such cases, the -10 dB ADJ is set at a TRK GEN RF POWER of -10 dBm and the 0 dB ADJ is set at a TRK GEN RF POWER of 0 dBm. These two adjustments must be iterated until the power level at the two settings are within the given tolerance.

Equipment

Measuring Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8902A Power Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8482A

Cable

Type N, 62 cm (24 in.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 11500B/C

Procedure

1.Set the HP 8560A LINE switch off. Remove the analyzer’s cover and place the analyzer in the service position as illustrated in Figure 2-12.

2-42 Adjustment Procedures