Cobham Wireless
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Coverage
BSF0060 User Handbook
www.cobham.com/wireless
Document number: BSF0060HBK
Issue number: 5
Date: 14/05/2018
Page 12 of 43
3.
BSF3604-406-411-115VAC - BSF0060
BSF3604-406-411-115VAC part number BSF0060 is a band-selective, Class B, fibre-fed repeater built
in to a dual purpose rack or wall-mounting, environmentally protected (IP65) aluminium alloy case;
external ports and connectors are also IP65 standard making the entire enclosure and connecting
ports weatherproof. Handles are provided for carrying the unit and the door is fitted with locks.
BSF0060 houses a fibre optic transceiver module for demodulating the Downlink optical signals to RF
and modulating the Uplink RF signals to optical to be transmitted to the Master Site. BSF0060 also
houses a Digital Signal Processing (DSP) module and a Downlink power amplifier to amplify channels
in the bands 406-420 MHz. It is designed for FM and P25 modulations with the emission designators
F1E and F3E.
The repeater houses a bandpass duplexer module connected to a common TX output/RX input port
(the “Server” port) for single antenna operation. The bandpass filters in the Duplexer module are
used to limit the out of band noise and prevent out-of-band signals from overloading the DSP Module.
Downlink.
BSF0060 receives a F/O feed via a WDM optical cable link from the master site. The F/O feed passes
into a F/O transceiver module and is demodulated to RF.
The RF Downlink path then passes through a 30dB coaxial attenuator and into the Downlink path of
the Digital Signal Processing Module which utilises SDR technology to digitally process the signals to
define the required channel frequency and bandwidth; automatic gain control and signal attenuation
functions are also provided.
The Downlink path then passes through a Multi-Carrier Power Amplifier; and then enters the
Downlink path of the Bandpass Duplexer module which filters the signal to pass the required
Downlink passband and reject out-of-band noise and then combines the Downlink and Uplink paths
whilst providing isolation between the two paths. The Downlink signal then exits BSF0060 via the
common TX/RX “Server” port.
Uplink.
The Uplink signal from the enters BSF0060 via the common TX/RX “Server” port and passes into the
Uplink path of the Bandpass Duplexer module which splits the Uplink from the Downlink path, filters
the signal to pass the required Uplink passband and reject out-of-band noise whilst providing isolation
between the Uplink and Downlink paths.
The Uplink signal then enters the Uplink path of the Digital Signal Processing Module which utilises
SDR technology to digitally process the signals to define the required channel frequencies and
bandwidths; automatic gain control and signal attenuation functions are also provided.
The Uplink path then passes into the F/O transceiver module where the RF signal is modulated onto a
laser for onward transmission to the master site as an optical signal over the WDM fibre optic cable
link
BSF0060 is powered by 115V AC which drives an internal power supply unit which provides a range of
DC voltages for the internal active modules. A supply On/Standby switch is fitted inside the unit.
An alarm system is fitted; active modules have alarm outputs which are collated by the Control
Module and modulated onto the Uplink optical signal for interrogation at the master site. The alarm
data is also made available via an Ethernet link which offers the ability of remote configuration and a
summary alarm, voltage-free contact relay output is made available via terminals 11 and 12 of the
external interface terminal block located in the base of the repeater.
