Signal Loss While Working With A Spectrum Analyzer - Keysight Technologies N5166B CXG User Manual

Troubleshooting
RF Output

Signal Loss While Working with a Spectrum Analyzer

To avoid damaging or degrading the performance of the signal generator,
do not exceed 33 dBm (2W)
input. See also
www.keysight.com
The effects of reverse power can cause problems with the RF output when you use the signal
generator with a spectrum analyzer that does not have preselection. Use an unleveled operating
mode (described on page
A spectrum analyzer can have as much as +5 dBm LO feedthrough at its RF input port at some
frequencies. If the frequency difference between the LO feedthrough and the RF carrier is less than
the ALC bandwidth, the LO's reverse power can amplitude modulate the signal generator's RF
output. The rate of the undesired AM equals the difference in frequency between the spectrum
analyzer's LO feedthrough and the signal generator's RF carrier.
Reverse power problems can be solved by using one of the unleveled operating modes.
See:
— "ALC Off Mode" on page 122
and
— "Power Search Mode" on page 123
448
Tips for Preventing Signal Generator Damage
.
122).
Keysight CXG, EXG, and MXG X-Series Signal Generators User's Guide
of reverse power levels at the RF
maximum
on