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Six basic functions of KC901S+:
reflection test(S11),
Transmission test(S21),
spectral view(SPEC),
filed intensity(FILED),
RF source (RF SOURCE),
audio frequency source(AF SOURCE).
MODE is used to select function. The equipment shifts between
function menu and function selection menu by using MODE a couple
of times. In most cases, MODE, equal to “HOME”, turns the screen
back to the function menu or function selection menu, so it is
frequently used.
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The typical application of Reflection Measurement (S11) is
measuring the standing wave of antenna. The right port should be
chosen.
Reflectometer is a kind of vector function with various display
modes, selected in FORMAT menu. In Smith Chart and impedance display,
the second soft menu from the left provides more display modes.
Access: press MODE and then select (S11). (FORMAT) in the soft
menu decides the display mode of measuring result.
The typical application of S21 is measuring amplitude-frequency
characteristics of filter or amplifier and gains of antenna. The
right RF port is to output signal, and the left one is to input.
Access: MODE and then press S21.
Insertion Loss Measurement is a special type of transfer measurement,
characterized by high respond speed. As a result, it applies to the
fine tuning of filter and measurement gains of antenna.
In order to keep consistence with the operating habits of ordinary
receivers, the entry into Insertion Lost Measurement is set in Field
mode.
Access: firstly MODE, and then press FIELD, finally press
Insertion to make “GEN ON” appear.
The typical application of SPEC is monitoring the occupancy and the
interference of band and adjusting circuits producing RF signals
except 45 MHz.KCSA-R100 is connected to find unidentified emission
source.
Access: MODE and then press (SPEC).
FIELD applies to not only measurement field strength coverage but
also searching the amplitude of RF. The port of 901S is capable of
DC isolation so as to externally connect probes to directly search
the signal value of receiver and transmitter. It is necessary to
match impedance and concatenate attenuator when detecting
transmitter. As long as experiences are got, FIELD is used to detect
emission the radio station to find fault in time.
Access: MODE and then press FIELD.
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RF SOURCE produces a milliwatts signal, with an application of
transmitting weak signals to the air to determine the sensibility
of radio station from a close distance, particularly the sensibility
of relay station. It is ha
ndier to use the small signal for
experienced users. More externally connected attenuators further
develop the applications of signal source.
To some extent, RF Source can adjust the signal level with the help
of a built-in attenuator. The output attenuator plays the role as
an amplitude modulator to carry out ASK. If the output attenuator
has applied to adjusting output range, the used decrement which has
been used is unable to modulate. As a result, the modulation degree
conflicts with the output attenuation. When output attenuation
increases, the modulation degree that can be used reduces.
Access: Press MODE to select NEXT, and then press RF SOURCE in
menu.
AF SOURCE produces a low frequency signal with a typical function
of adjusting the voice-grade channel of electronic equipment.
Because AF SOURCE, with various modulation modes, produces the firm
output of 50MHz, it is used to adjust RF circuits under 50MHz.
In actual, AF SOURCE can be set in a high frequency (but does not
guarantee indices). With the help of its harmonic wave, it can be
used to debug the sensitivity of radio stations.
Access: Press MODE and then select AF SOURCE in menu.