Handheld Spectrum Analyzer ¸FSH8
Scalar transmission and reflection measure-
ments with VSWR bridge (¸FSH-Z2/-Z3 as
accessory)
The ¸FSH with built-in tracking generator rapidly determines the
transmission characteristics of cables, filters, amplifiers, etc, with a
minimum of effort. When equipped with the ¸FSH-Z2/-Z3 VSWR bridge
(10 MHz to 3 GHz/6 GHz), the ¸FSH can also measure the matching (return
loss, reflection coefficient or VSWR) of an antenna, for example. The bridge is
screwed directly onto the ¸FSH’s RF input and tracking generator output
without involving cumbersome, extra cabling. The innovative design of the
¸FSH-Z3 VSWR Bridge with integrated RF bypass switch allows the
user to make spectrum and transmission measurements also with the bridge
connected. Active components such as amplifiers can be supplied directly via
the RF cable by means of the two integrated bias tees.
Vector transmission and reflection measurements
Compared to scalar measurements, the optional ¸FSH-K2 vector measure-
ment significantly increases measurement accuracy and dynamic range for
transmission and reflection measurements. This is possible because the receive
signal is analyzed with respect to magnitude and phase. After calibration,
complex correction of the system errors can be effected by the ¸FSH.
To allow detailed analysis of the matching of, for example, an antenna, the
magnitude and phase are displayed in a Smith chart. A user-definable limit line
comes in handy when evaluating the measurement results.
One-port cable loss measurements
The ¸FSH with tracking generator and VSWR bridge can determine the
cable loss of previously installed long cables without much effort. One end of
the cable is connected to the VSWR bridge, and the other end is terminated
with a short circuit or simply left open. The calculated cable loss represents
the average value within the displayed frequency range. The loss at specific
frequencies is determined via markers. The one-port cable loss measurement is
only available with the option ¸FSH-K2.
¸FSH-Z3 VSWR bridge
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