Tracking Generator - Option R&S FSP-B9 R&S ESCI
1166.6004.12 4.286 E-1
EXT I/Q
The EXT I/Q 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 following functions:
– active external AM
– active external FM
Functional description of the quadrature modulator:
0°
90°
I channel
Q channel
I mod
Q mod
RF IN RF OUT
Fig. 4-33 I/Q modulation
I/Q modulation is performed by means of the built-in quadrature modulator.
The RF signal is divided into two orthogonal I and Q components (inphase
and quadrature phase). Amplitude and phase are controlled in each path by
the I and Q modulation signal. By adding the two components an RF output
signal is generated that can be controlled in amplitude and phase.
IEC/IEEE-bus command: SOUR:DM:STAT ON
MODULATION
OFF
The MODULATION OFF softkey switches off the modulation of the tracking
generator.
IEC/IEEE-bus command: SOUR:AM:STAT OFF
SOUR:FM:STAT OFF
SOUR:DM:STAT OFF
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