Tracking Generator
R&S
®
ESR
499User 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
The "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
The "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
The "External I/Q" 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
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