Televes DTT, Руководство пользователя

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4. - IDENTIFICATION AND USE OF THE SYSTEM ELEMENTS
4.1.-DTT Channel Processor. Front and side views
PRGM
PWR
DIGITAL
CTRL
5
1
3
2
4
6
8
7
The Processor converts the input DTT chan-
nel down to the Intermediate Frequency (36,15
MHz) and then back to desired output chan-
nel. It includes double SAW filtering to allow
the processing of digital channels having adja-
cent (analogue or digital) channels, even if the
latter are analogue with a level 35 dB higher
than that of the digital.
The new DTT channels are transmitted in
channels adjacent to the current analogue ser-
vices thus impeding the use of the conventio-
nal Channel Amplifiers due to their low selecti-
vity. Only channel processors including SAW
filtering are able to cope with adjacent chan-
nels.
The Processors may be used as channel con-
verters (using different input and output chan-
nels) or with the same input and output chan-
nel.
The Channel Processor includes one input and
one output for the RF input signal through the
two upper "F" connectors, so it is possible to
power several processors with the incoming
signal.
It also allows the powering of a preamplifier (12
Vdc) through the input connector.
It also has one input and one output connec-
tors for the RF output signal with the aim of
mixing the processed channels before the
amplification.
1.- RF Input plus 12V
2.- RF Output (input loop-through)
3.- RF Input (output loop-through)
4.- RF Output
5.- Programmer socket
6.- Powering input
7.- LED on
8.- Control BUS connector
Indicate the programmed
output channel
DTT
5870
Ch
470-862 MHz
Ch
Product reference
25
User manual DTT Channel Processor
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