Monitor Operating Mode - Promax MC-577 Manuel D'utilisation

In order to avoid saturation of the input stage, if you have several channels present
at the input with amplitudes of about 75-80 dBµV for analogue signals, or 70-75 dBµV in
the case of digital signals, you should use RF attenuators and thereby avoid the
possibility of producing measurement errors.
One of the applications of the MC-577 as a spectrum analyser is in searching for
the best orientation and placement of receiver antenna, both for terrestrial TV and most
particularly in the case of satellite TV.
In the satellite band (SAT), the device is also a great aid in the placement and
correct orientation of antenna because it can detect a satellite signal even when the
received signal is much weaker than the minimum level required to obtain an image.
Furthermore, the instrument permits the exact adjustment of the LNB regarding its
physical position to obtain the maximum ratio between Horizontal and Vertical polarities.

4.2.5 Monitor operating mode

In the Monitor operating mode the MC-577 works like a conventional television. In
addition, when the audio control
top of the image whose length corresponds to the level/power of the tuned signal.
Below this bar, superimposed on the middle top of the TV image, the line synchronism
pulse is shown with which it is possible to easily detect any possible saturation of the
amplifiers in terrestrial bands. The following figure shows the three types of information
appearing on-screen in the Monitor operating mode: demodulated television image (the
example shown in figure 6 shows a scale of greys), measurement bar (67 dBµV in
figure 6) and a representation of the line synchronism.
To better observe and identify the tuned channel, it is possible to eliminate the
measurement bar and the synchronism pulse by pressing the audio control
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[28] is released, you will see a horizontal bar at the
Figure 6.- Monitor operation mode.
USER'S MANUAL MC-577.
[28].
05/2003