Fracarro FRPRO 06 Instructions D'emploi page 25

2.3 DESCRIPTION OF THE AMPLIFICATION STAGES
The Profiler unit is comprised of 3 amplification stages. input dynamics, cluster amplification and final gain.
These 3 gains are included in the automatic phase of the self-alignment and they can be programmed ma-
nually by the user. The self-alignment function allows for the maintenance of the noise figure to be as low as
possible and it aligns the clusters for the maximum output level.
The first stage of amplification of the UHF inputs is named "DYNAMICS IN", its attenuation can be changed
from 0 to 20 dB; the amplification works on the whole 470÷862MHz band of the UHF input that is being pro-
grammed. This is to be used to get the best noise figure for the UHF input as regards the input signal levels.
The second amplification stage concerns the single cluster that is being programmed, or "CELL GAIN and this
is adjustable from 0 to 20 dB. This is to be used to equalize the clusters' output level.
For the B.III+DAB, FM and AUX inputs, there is an adjustable band amplifier (one on each input) with a gain
that can be adjusted from 0 to 20 dB.
The last amplification stage is the "FINAL GAIN," which can be adjusted from 0 to 20dB. It works on all the
headend unit inputs either on the UHF inputs and B.III+DAB, FM and AUX inputs .
2.4 REMOTE POWER SUPPLY
The headend unit can be used to remotely power supply the mast pre-amplifiers, if any, or other remote ac-
cessories. By programming, it is possible to select the remote power supply voltage either at 12V or 24V with
a maximum current for the UHF inputs of 200mA@12V or 100mA@24V (to be intended as the total addition
of the UHF1 and UHF2 inputs).
All remote power supplies are protected from short-circuits to safeguard the internal feeder.
UHF1 UHF2
DYNAMIC IN DYNAMIC IN
DINAMICA IN DINAMICA IN
UHF1 UHF2
UHF1 UHF2
(0-20dB) (0÷20dB) (0-20dB) (0÷20dB)
CLUSTER MATRIX
MATRICE A CLUSTER
CELL GAIN (0-20dB)
GUADAGNO CELLA (0÷20dB)
Fig. 2.2 - Description of the amplification stages
BIII+DAB
BIII+DAB
GUADAGNO
GUADAGNO
GAIN
BIII+DAB
(0-20dB)
(0-20dB)
(0÷20dB)
(0÷20dB)
+
GUADAGNO
FINAL
FINALE
GAIN
(0÷20dB)
(0-20dB)
TV
OUT
25
FM AUX
FM AUX
GUADAGNO
GAIN GAIN
FM AUX
(0-20dB)
(0÷20dB)