Promax HD Ranger +, Руководство пользователя

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December 2014
21
A2.1.5
Fine tuning the dish
Once we know for certain that we are on ASTRA 19E it is time to make fine
adjustments to the dish to optimise the alignment. There are two goals to
achieve. On the one hand we want to receive the maximum amount of power
possible and on the other hand we need to make sure we minimise the
interference from the crossed polarisation.
In order to maximise the received signal power we need only to move the dish's
azimuth and elevation very carefully ensuring that the display of the spectrum
analyser show us the highest values possible.
As you move the dish's position you will see the signal change on the spectrum
analyser. Cross-polarisation is adjusted by rotating the LNB on its axis. As you do
so you will see on the
HD
RANGER
+ screen how the channels interfering from
the opposite polarisation go up and down the objective being to leave the LNB in
such a position that those channels are as low as possible.
A2.1.6
Testing signal quality
The
HD
RANGER
+
is the ideal instrument for quick and effective checks of
signal quality not only because it shows all measurements in one single screen
but also because the meter doesn't require bothering configuration processes.
►
Option 1: Frequency mode
I can tune in frequency mode all channels coming up in the screen, all of
them or the most representative ones only. We can move our cursor in
frequency mode, in spectrum, through out the band. When we stop on a
channel, the meter will acquire all the settings needed to measure the
channel without bothering us. Then pressing the measurement button and
voilà.
►
Option 2: Channel mode
I can select channel mode and a satellite channel table from the list. The
HD
RANGER
+ has several of them preloaded but this can be changed
using software application.
Once we select the desired table, ASTRA 19E in this case, we can browse the
channels at once. There are channel tables grouped by polarisation or band
or those with all channels in the satellite.