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19.4 The satellite reception via optical fiber
With optical fibers, the satellite emission is the same as in standard reception mode, but at the output of the
head, instead of 4 bands (HH HL VH VL), there are only 2 bands (vertical and horizontal) in optical signal
mode (the optical head is powered by an independent external power supply).
On your installation, at the end of the fiber, you must install a converter that turns your optical signal to a 4-
band RF signal: HH HL VH VL; VL and HL bands are between 950 and 1950MHz; VH and HH bands are
between 1100 and 2150MHz. Band commutations on this converter are made with 0/22kHz and 13/18V like
on any classical installation.
In our case, the output of this head (fiber) may be directly connected to the appliance, which will manage the
bands like the converter in order to allocate them between HH, HL, VL and VH. Thus, the use is transparent.
Warning:
the LNB is powered independently.
To display the signal at the output of your installation, you must connect the RF output of the optical option
to the RF input of the appliance via the provided angled F/F cable. Power your LNB (no external power supply
is provided with the measurement appliance).
Remove the protective plug from the FC APC optical socket; if required, use the provided jumper cable, and
connect the optical fiber from your dish to the same socket.
You can then direct your dish (
see chapter 2.2.3 Installation of a dish
)
Once the measurements are over,
put the protective
plug
on to the optical socket
of the appliance
.
Warning: The appliance can measure only one wavelength at a time. If there are several wavelengths,
measurements will be wrong.
You’d better check the optical power of the LNB before processing (
Measurement of optical power
)
Measurement on FC APC
External power
supply
Vertical polarisation sat... 10750 to 12750
Horizontal polarisation sat. 10750 to 12750
Warning: The optical head is pow-
ered independently from the fiber
output
Vertical polarisation fiber
950 to 3000MHz
Horizontal polarisation fiber
3400 to 5450MHz
Fiber output
