R&S SMJ100A, Operating Manual

Page: 262 / 874

Instrument Function
R&S
®
SMJ100A
246 Operating Manual 1403.7458.32 ─ 14
5.5.11.4 Frequency Modulation (FM)
Frequency modulation (FM) requires option R&S SMJ-B20 (FM/PhiM Modulator).
An internal and/or external source can be selected for frequency modulation. The LF
GEN modulation generator is available as the internal source. Two-tone FM is possible
by simultaneously switching on the external and internal source.
The EXT MOD input connector for external feed is at the rear of the instrument. The
coupling mode of the input (AC or DC) and 50 Ohm or high (> 10 kOhm) impedance
can be selected.
It is not possible to use frequency modulation simultaneously with phase modulation.
See
"Simultaneous Operation of Several Modulations or Other Operating Modes"
on page 241 for an overview in detail.
Frequency Modulation Settings
To access the "Frequency Modulation" dialog, select "RF/A Mod > Configure > Fre-
quency Modulation" or use the MENU key under "RF/A Mod".
You can configure frequency modulation settings in the top section of the combined
"Frequency/Phase Modulation" dialog. In the lower section, you can find the settings
for phase modulation,
Chapter 5.5.11.5, "Phase Modulation (PhiM)" , on page 248.
State
Activates frequency modulation.
Activation of FM deactivates phase modulation.
RF Signal and Analog Modulations - RF Block