Tracking Generator
R&S
®
ESR
499
User Manual 1175.7068.02 ─ 12
Table 8-2: Simultaneous modes of modulation (tracking generator)
Modulation
Frequency offset
EXT AM
EXT FM
EXT I/Q
Frequency offset
●
●
●
EXT AM
●
●
EXT FM
●
●
EXT I/Q
●
●
= can be combined
External AM
on page 479 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.
External FM
on page 479 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.
Phase deviation h = deviation/modulation frequency
The modulation signal is applied to the TG IN Q/FM connector.
Switching on an external FM disables the active I/Q modulation.
External IQ
on page 479 softkey activates the external I/Q modulation of the
tracking generator.
The signals for modulation are applied to the two input connectors TG IN I and TG IN
Q at the rear panel of the unit. The input voltage range is ±1 V into 50
Ω
.
Switching on an external I/Q modulation disables the active external AM or FM.
Functional description of the quadrature modulator:
Tracking Generator Functions
