Function Description - Deepace KC901M User Manual

2.4 Function description

Six basic functions of KC901M
Reflection test (S11)
Transmission test (S21)
Spectrum (SPEC)
Field strength (FIELD)
RF signal source (RF SOURCE)
Audio signal source (AF SOURCE)
MODE button is for function selection. Function can be switched by pressing
MODE repeatedly. In most situations, user can switch back to the function
menu/function selection menu by just pressing MODE, it can be used like a HOME
button
Reflection test (S11)
The typical application of reflection test (S11) is to test antenna's VSWR and
impedance. For this function, please use the port on the righthand side. (See Chart
2-4)
Reflection is measured in vector. It has various ways to display which can be
chosen through the FORMAT menu. When showing Smith chart and the impedance,
the soft menu from the second left can provide more options for display.
Access: Press MODE and then choose the item of reflection test (S11) in the
menu.
Transmission test (S21)
The typical application of transmission measurement (S21/12) is to test the filter
and the amplitude-frequency characteristic chart. For this, both two N type RF ports
need to be used. Signals are output from the instrument's left side port and input into
the right side port.
Access: MODE and then choose item S21.
Attention:
While performing the transmission measurement, the signals released flow in the
opposite direction to those in reflection measurement, which is different from usual
network analyzer designs (including the KC901S). This means, after testing S11, to
test S21, you must switch the two ports according to the indications on the device.
Insertion Loss Measurement is a transmission measurement at single frequency
point that can respond so quickly enough that it allows users to adjust the Device
Chart 2-5 Ancillary ports on the right side
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