Satellite Detection And Localisation (1> Detect) - Promax PRODIG-1+ Manual De Instrucciones

USER'S MANUAL PRODIG-1+.
During the entire process the instrument monitors the state of the cable, the
connector and LNB. Therefore, if it detects that the noise level is below a reference
level (standard value: 100 mV), the display will show the message 'NO LNB?' indicating
that the LNB is not detected.
Figure 9.- DETECT function screen when no LNB is detected.
If the measured LNB power supply voltage falls 1 V below the nominal value (for
example 12 V when the nominal value is 13 V) the instrument displays the message
'CABLE SHORT' (short-circuit) and temporarily switches off the power source to prevent
overloads. After 3 s, it switches on the power supply again to see if the short-circuit has
disappeared.
This may occur due to a temporary fall in voltage when connecting or disconnecting
the instrument from the rest of the installation. The message may also appear when the
power supply overloads on using an LNB with excessive consumption.
4.2.1 Satellite Detection and Localisation (1> DETECT)
This function is directly accessed on starting the instrument. If this is not the active
function, press key
The purpose of this function is to detect when the antenna is pointing to a satellite
(detection).
On connecting the instrument to the low-noise amplifier located in the antenna
focus, the passage of any radio-frequency source (the satellite) is shown by a bar-graph
and an acoustic indication. To produce this indication, the instrument measures the
energy received across the entire satellite band.
In the case of no detection, the bar remains to the left of the display. When a
satellite is detected, the bar moves to the right of the display in proportion to the power
of the detected signal.
On moving the antenna from one end to the other (for example, from east to west)
you can count the different geostationary satellites detected.
The bar indication is percentage, relative to the maximum signal level that may be
measured by the detector. So that for the same type of antenna and LNB, you will
obtain approximately the same detection value.
The bar-graph scale dynamically adapts to the maximum and minimum levels being
detected, thereby optimising the sensitivity of the bar-graph.
The screen also shows the measured value of the voltage supplied to the LNB and
displays if the 22 kHz signal is being applied (see figure 10).
05/2003
[1] to select it.
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