BX-240 • 13
© Box 73 Amateurfunkservice GmbH 2017
contrast to the
<
and
>
mode, no new
measurement cycle is triggered by but-
ton pressing, only the changed marker
position, including the corresponding
measured value, is displayed. The mea-
sured values determined before switch-
ing to mode
M
have been ‘frozen’ and
can now be ‘traced’ using the marker. A
new measurement value is only taken
again when switching to mode
<
or
>
.
The combination of these three modes
makes it easy to ‘target’ certain frequency
ranges during measurements, to intercept
values at specific points.
For internal SOL compensation, the unit
always uses the reference values from the
master calibration.
Single run for impedance
measurement
The active resistance (solid curve) and the
reactance (dashed curve) are shown above
the frequency. All further displays and op-
erating possibilities correspond to the ver-
sions in the previous section.
SWR measurement on five
frequencies (5 band measurement)
Five SWR values are displayed in the bar
graph for five different frequencies. Their
values can be defined via the
Setup
menu.
In this measuring mode no other options
are available. But you can simultaneously
observe the practical effects of any
changes with multi band antennas.
The internal SOL compensation is always
performed using reference values from
SOL All Frequencies
(Fig. 23).
Fig. 23: SWR measurement on 5 frequencies
Fig. 22: Marker on 7900 kHz
Fig. 21: Single run of SWR measurement
