Table of Contents
Advertisement
18.4
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 trans-
parent. Warning: the LNB is powered independently.
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
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.
Vertical polarisation sat... 10750 to 12750
Horizontal polarisation sat. 10750 to 12750
External power
supply
You can then use "Check Sat" function for your dish.
Once the measurements are over, put the protective plug on to the optical socket of the appliance.
7849B – 7859B – 7817B
Fiber output
Vertical polarisation fiber
950 to 3000MHz
(Measurement of optical
Warning: The optical head is pow-
ered independently from the fiber
output
Horizontal polarisation fiber
3400 to 5450MHz
p.
82
power)
Measurement on FC APC
Advertisement
Table of Contents
