5-14.
UNLEVELED RF OUTPUT ADJUSTMENTS
Reference
Performance Test:
Maximum
Leveled Output Power and Accuracy
Service Section:
RF
Section
Description
The A28 SYTM Driver assembly is adjusted to cause the SYTM frequency response to track the YO
frequency. When the YO
frequency
is in the center of the SYTM passband, the power loss through the
SYTM is minimum; therefore, SYTM tracking is adjusted while viewing power out versus frequency
and adjusting the SYTM for maximum power out. In the multiplying bands, Bands 2, 3, and 4, optimum
biasing of the step
recovery
diode (SRD, internal to the SYTM) is also required for maximum power
out. Since this the case, the SRD bias adjustments on the A24 and A26 assemblies are also performed
in this procedure.
OSCI LLOSCOPE
Figure 5-40.
Unleveled RF Output Adjustments Setup
HP 8340B/41B
Adjustments
5-71