R&S FSH
Two-port measurements with the tracking generator
1145.5973.12 4.99
E-14
Supplying DC voltage to active DUTs
By using the VSWR Bridge R&S FSH-Z3, DC voltage can be supplied to active DUTs such as
amplifiers through the integrated bias tees (BIAS 1 and BIAS 2) via the RF cable. The DC voltage is fed
in from a suitable external power supply (max. 300 mA/max. 50 V). To measure the antenna coupling of
mobile radio base stations, the DC voltage must be supplied to two tower-mounted amplifiers (TMA).
This is done by applying a suitable voltage at the BIAS 1 and BIAS 2 BNC inputs of the VSWR bridge.
Reflection measurements
The VSWR Bridge R&S FSH-Z2 or R&S FSH-Z3 is required for reflection measurements. However, an
equivalent bridge (e.g. the R&S ZRB2 from Rohde & Schwarz) can be used.
Connect the control cable of the R&S FSH-Z2/-Z3 to the power sensor socket of the R&S FSH.
Connect the RF connectors of the R&S FSH-Z2/-Z3 to the RF input and generator output of the
R&S FSH (see labeling on VSWR bridge).
.
R&S FSH with the VSWR Bridge R&S FSH-Z3
VSWR Bridge
and
Power Divider
R&S FSH-Z2
Test port
Control
cable
R&S FSH with the VSWR Bridge
R&S FSH-Z2
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