Promax MC-377+ Instruction Manual page 68

INSTRUCTION MANUAL MC-377+.
IN THE MAX REPRESENTATION MODE, THE TUNING FREQUENCY READING ON
THE FREQUENCY COUNTER DISPLAY [22] IS DEACTIVATED.
When obtaining the levels of different signals, you will find a set of continuous
vertical lines on the image, together with others in the form of points, forming a grid
which corresponds to divisions of 10 and 5 dB respectively, depending on the scales
[32] or [33] found along the top of the monitor [1]. See section (4.2.5 Taking
measurements).
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-377+ 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.
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IMPORTANT
May 2001