ES10/ES26
Page 42/104
Document status: released
Operating Manual
rev. 01, 03.11.08
5.3.2.2 RF Mode “AGC-off”
In this mode, which is for experienced users only, the user has the flexibility to change the gain of
the internal RF amplifier by at least -6 … +6 dB according to his individual requirements.
However, this adjustment is changing the RF input sensitivity. The OMI
totrms
is measured for the
applied input signal and the selected gain and can be monitored on the LCD display or via the
Ethernet interface.
This mode should only be used with great care since the automatic protection against
overmodulation as given in the AGC-on mode is lost.
5.3.3 Adjusting regulation mode
There are two kinds of bias point regulations: “Channel controlled” and “Pilot controlled”.
Since the transmitter working in “channel controlled” mode requires an input signal in order to
adjust its electrooptical modulator’s bias point, at least 2 RF channels with a channel spacing of
24 MHz (software adjustable) are required to obtain a stable performance.
In “pilot controlled” mode, RF input signal is not required for internal bias point adjustment,
because the transmitter uses an internal pilot control. The pilot frequency is outside the
transmitted RF frequency range in order not to target user’s signals.
5.3.4 Applying an appropriate RF SAT-IF input signal
For proper operation of ES26 SAT-IF input, an appropriate SAT-IF RF input signal within the
specifications has to be applied at the SAT-IF RF input port. The SAT-IF signal should provide an
rms level within the range specified in the following table. In this case, the SAT-IF AGC can
adjust the optimum OMI
SAT,totrms
as recommended in the table.
ES26 Version
Total OMI
OMI
SAT,totrms
RMS Level Range
P
SAT,rms
P
SAT
Level Range
(for 36 SAT carriers)
C42
(42 PAL)
4.2 %
-11 … +5 dBm
82 … 98 dBµV
PAL84
(84 PAL)
3.0 %
-11 … +5 dBm
82 … 98 dBµV
N77
(77 PAL)
3.0 %
-11 … +5 dBm
82 … 98 dBµV
ISH
(35 PAL, 17
64QAM, 3 256QAM)
4.2 %
-11 … +5 dBm
82 … 98 dBµV
Upgrade
(47 PAL, 17
64QAM, 6 256QAM,
36 FM)
4.2 %
-11 … +5 dBm
82 … 98 dBµV
KDG470
(33 PAL, 14
64QAM, 36 FM)
4.2 %
-11 … +5 dBm
82 … 98 dBµV
KDG470b
(33 PAL,
14 64QAM, 36 FM)
4.2 %
-11 … +5 dBm
82 … 98 dBµV
Table 5.3.1.1: ES26 SAT-IF RF input leveling
