UNAOHM
10
NG500 (Rev. 0)
Figure 3 Simplified structure of a typical shared installation
The operations are carried out in two phases. First the instruments are calibrated connecting the
noise generator to the field strength meter thereby establishing a reference level.
Then, as indicated in the block diagram in figure 4A :
1) Apply the signal, supplied by the noise generator, to the input connector of the field strength
meter tuning it to both the frequency band required (VHF-UHF or SAT).
2)
Set the attenuator of the meter to an input level between 70 and 80 dBµV.
3)
Switch the meter to spectrum function, either expanded (partial view of the bandwidth) or full
depending on how much of the bandwidth you wish to cover.
Note: Ideally, the pattern observed should have a constant amplitude (level) throughout the
entire frequency range being analysed, but this is difficult to come across since the frequency
Figure 3 legenda: -Sistema di antenne riceventi = receiving areal system
-Miscelatore = mixer.
