External Modulation Of The Tracking Generator - Rohde & Schwarz R&S FSP Series Operating Manual

R&S FSP
4.8.6

External Modulation of the Tracking Generator

MODULATION
EXT AM
EXT FM
EXT I/Q
MODULATION OFF
The MODULATION softkey opens a submenu for selecting different modulation
modes.
The time characteristics of the tracking generator output signal can be influenced by
means of external signals (input voltage range -1 V to +1 V).
Two BNC connectors at the rear panel are available as signal inputs. Their function
changes depending on the selected modulation:
•
•
The modulation modes can be combined with each other and with the frequency off-
set function up to a certain degree. The following table shows which modulation
modes are possible at the same time and which ones can be combined with the fre-
quency offset function.
Table 4-7
Modulation
Frequency offset
EXT AM
EXT FM
EXT I/Q
# = can be combined
EXT AM The EXT AM softkey activates an AM modulation of the tracking generator output
signal.
The modulation signal is applied to the TG IN I / AM connector. An input voltage of
1 V corresponds to 100% amplitude modulation.
Switching on an external AM disables the active I/Q modulation.
Remote command:
EXT FM The EXT FM softkey activates the FM modulation of the tracking generator output
signal.
The modulation frequency range is 1 kHz to 100 kHz, the deviation can be set in 1-
decade steps in the range of 100 Hz to 10 MHz at an input voltage of 1 V. The phase
deviation h should not exceed the value 100.
Operating Manual 1164.4556.12 - 06
TG IN I / AM and
TG IN Q / FM
Simultaneous modes of modulation (tracking generator)
Phase deviation h = deviation / modulation frequency
Tracking Generator – Option R&S FSP-B9
Frequency EXT AM
offset
#
#
# #
#
SOUR:AM:STAT ON
Instrument Functions
EXT FM EXT I/Q
# #
#
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