following block diagram shows a typical scenario of a teleport. The LNCs at the different antennas
provide L-Band output signals which have to be routed via long cable runs from the antennas to a
central site, in this case a switch matrix. The optical transmitter converts the analog L-Band
spectrum (or any other RF spectrum in the specification of the different modules) with the help of
a laser diode to a optical output signal with a wavelength of 1310nm. This is the standard
wavelength used by most of the laser diodes. But it is also possible to select another wavelength
on request by selecting another laser diode.
This example shows a satellite receive and transmit application with two antennas and at different
locations, but with one sat-nms LFTXRX chassis which handles all signals from both antennas
and the uplink signal to the second antenna. In this case the satellite modulator delivers its L-
Band or 70MHz signal to the optical transmitter located for example in the central building and at
the end of the optical fibre link a optical receiver regenerates the RF signal spectrum which can
be delivered for example to a block up-converter (BUC).
As already explained in this TX application it is also possible to provide the 10MHz reference
frequency for the BUC via the same optical link. You can see in this block diagram also the
redundant configuration of the receive path from the first antenna.
(C) 2021, SatService GmbH
www.satnms.com
LF20-UM-2107 Page 38/43
