SERVICE MANUAL
Document No
Date of Origin
Date of REV
51-L-DSR004
98-10-21
PAGE REV.
0
PAGE
13 /102
S-00-005(96.03.27)
REV.1
4-3. LNB Con t r o l Signal
LNB control
signal is used to select frequency
band (low/high
band), either
conventional(22KHz
tone) signalling
or the new signalling
method(DiSEqC)
could be used to control
the switch.
The DiSEqC system is a communication
bus between
satellite
receivers/IRDs
and satellite
peripheral
equipment,using
only the existing
coalial
cable.
This single master microcontroller-based
system is bi-directional
and
enables
controlling
of satellite
peripherals
like;
- LNBs
- multi-switches
- SMATV switch nodes
- antenna
positioners
- polarizer
control
units
- other devices
4-3-1.
LNB control
frequency
:
22 kHz
¡¾
2 KHz
4-3-2.
duty cycle
:
50%
¡¾
10%
4-3-3.
control
signal amplitude
:
0.6 V
¡¾
0.2V p-p
4-3-4.
transition
time
:
10
§Á ¡¾
5
§Á
4-3-5.
source impedance
:
¡Â
50
§Ù
4-3-6.
LNB supply voltage
:
12.5 - 14.0
(vertical)
:
17.0 - 19.0
(horizontal)
4-3-7.
DiSEqC Bus functional
spec
:
V4.1, at level 1.1
