31
User manual
DTT Channel Processor
ENGLISH
For an offset value -1, the display will show
the following:
Record data as done in the normal menu.
5.-
Press the
key again to select the
out-
put frequency
offset. In this mode the “C”
LED will be ON.
Follow the previously explained procedure
for selecting, changing and recording the
data.
Ref 5871
OF-3
- 3 x125 KHz
OF-2
-2 x 125 KHz
OF-1
-125 KHz
OF-0
Nominal frequency
OF+1
+125 KHz
OF+2
+2 x 125 KHz
OF+3
+3 x 125 KHz
The format of the display for a selected
slope of - 2dB would be:
By pressing the
&
buttons, the user
can select the desired slope in steps of 1
dB.
4.-
Press the key again to select the next
menu for the
input frequency offset
. In this
mode also the
A
LED will be ON.
Pressing the & keys an offset value between
+3, +2, +1, 0, -1, -2, -3 can be selected.
Each one represents a frequecy shifting
according with the following tables:
Ref 5870
OF-3
-3 x 166 KHz
OF-2
-2 x 166 KHz
OF-1
-166 KHz
OF-0
Nominal Frequency
OF+1
+166 KHz
OF+2
+2 x 166 KHz
OF+3
+3 x 166 KHz
of the addresses are repeated on this bus.
The address is a parameter that is saved
every time it is modified.
2.- Preamplifier powering
. The processor
disposes of 12V that passes through the
input connector to power a preamplifier for
those cases in which the input level is less
than the minimum required.
To select this powering, the user must use
the & buttons.
The programmer's display will read 12ON if
the power is in the input connector and
12OF when it is not:
3.-
By pressing the
button again, the user
gains access to the menu that deals with the
slope variation
.
This lets you adjust the flatness of the digital
channel by up to ± 3 dB. If the slope values
are positive, then this indicates that the pro-
cessor's response curve (with the highest
frequency) is such that the top part (with the
highest frequency) of the channel is attenua-
ted with regard to the lower part, while
negative values indicate that the amplitude
of the lower part is lower.
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