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Field Strength mode (FIELD) is for testing field strength and signal coverage, as
well as detecting the amplitude of RF signal in circuit conveniently. Due to DC isola-
tion is already installed, user can connect probes to test signals with DC bias in re-
ceivers and transmitters directly. But be careful of impedance’s match. Also it’s nec-
essary to take safety measures for the attenuator and the DC block which are con-
catenated with KC901V while detecting the transmitter. After some experience, users
can use field strength mode to quickly judge if radio station’s emission is strong
enough. For this mode, use the port on the right side.
Access: Press MODE (PAGE DOWN) then choose FIELD in the menu.
RF Signal Source (RF SOURCE) is for producing a signal in mW range, its typical
application is to transmit a weak signal to check radio station’s sensitivity in short dis-
tance. For user with experience, this weak signal is very convenient. External attenu-
ator can be added to extent the usages of signal source.
The RF signal source’s output level can be adjusted through internal output at-
tenuator. Instrument’s output attenuator can also be used as an amplitude modulator
generating ASK signal. if the output attenuator is already used for adjusting output
power, the modulation depth is limited by output attenuation level. The bigger the
attenuation is, the smaller the modulation level which can be used will be.
In RF signal source mode, use the N-port on the left side.
Access: Press MODE and then PAGE DOWN, finally choose RF SOURCE in the
menu.
Audio Signal Source (AF SOURCE) is for producing a low-frequency voltage signal.
its typical application is to adjust the audio signal paths in devices. Since the audio
signal source can produce a steady output up to 50MHz with various modulation, it
can also be used for adjusting RF circuits under 50MHz.
The Audio signal source actually can be set to a very high frequency (performance
can’t be guaranteed). With under-sampling output, it can also be used for adjusting
radio station’s sensitivity and so on.
Access: Press MODE and then choose PAGE DOWN, finally choose AF SOURCE in
the menu.
2.5 Adjust Operation State
When the instrument starts, default is to sweep only once then it turns into
STOP state. If you want the instrument to start sweeping, you must start it by yourself
by pressing RUN/STOP. Instrument will sweep constantly with one key press and will
stop sweeping if pressed one more time. RUN/STOP supports secondary functions.
Press SHIFT first and then press RUN/STOP to turn RUN/STOP into single sweep but-
ton. When the screen shows this sign “ ”, the instrument only sweeps once with
one RUN/STOP button press. Repeating the operation of SHIFT+RUN/STOP can cancel
this function.
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