Futurecom Systems Group ULC. CMDUHF Manuale Utente
8M074X01-01 Rev.1
6
5.0 MAIN FEATURES
The Channel Module is a fully software configurable, synthesized, narrow band device, with 35 Watt
output power capability. Its purpose is to receive a single RF channel, amplify and filter the channel
signal and re-transmit it.
output power capability. Its purpose is to receive a single RF channel, amplify and filter the channel
signal and re-transmit it.
The Transceiver (TS) stage receives a single channel off air using double heterodyne principle and
downconverts the signal to an Intermediate Frequency . The Intermediate Frequency processing
performs most of the signal filtering required for a given frequency band and channel spacing. The
rigorous filtering allows only the desired signal (channel) to pass and to be amplified assuring that all
undesired signals on other frequencies are not transmitted. The filtered signal is upconverted to the
output frequency and amplified by the Power Amplifier (PA). The PA has driver and final power stages
fully redundand, with automatic switch-over in the case of detected malfunction.
downconverts the signal to an Intermediate Frequency . The Intermediate Frequency processing
performs most of the signal filtering required for a given frequency band and channel spacing. The
rigorous filtering allows only the desired signal (channel) to pass and to be amplified assuring that all
undesired signals on other frequencies are not transmitted. The filtered signal is upconverted to the
output frequency and amplified by the Power Amplifier (PA). The PA has driver and final power stages
fully redundand, with automatic switch-over in the case of detected malfunction.
The personality of the unit can be programmed directly from a personal computer via front panel serial
port. The Channel Module software resides in Flash memory and can be upgraded serially without
opening and retesting the unit. Software upgrade/change can be performed remotely in the same way as
personality change.
port. The Channel Module software resides in Flash memory and can be upgraded serially without
opening and retesting the unit. Software upgrade/change can be performed remotely in the same way as
personality change.
The chassis of the Channel Module is made of machined aluminum. The rugged construction of the unit
minimizes microphonics effects and internal feedback. The unit housing is in standard double Eurocard
format. The installation of the Channel Module is performed by simply plugging it into a 19” rack-
mounted Futurecom 7V055X01 or 7V055X02 card cage, and connecting RF input and output cables
to front panel SMA connectors.
minimizes microphonics effects and internal feedback. The unit housing is in standard double Eurocard
format. The installation of the Channel Module is performed by simply plugging it into a 19” rack-
mounted Futurecom 7V055X01 or 7V055X02 card cage, and connecting RF input and output cables
to front panel SMA connectors.
The Channel Module is capable of operating in two different modes. In the typical Repeater mode, the
Channel Module transmits on a frequency which is different from the receive frequency. The maximum
achievable gain in this mode is 165 dB. The On Channel Repeater transmits on the receive frequency
making the Channel Module transparent to the user. The maximum achievable gain in the OCR mode is
150 dB.
Channel Module transmits on a frequency which is different from the receive frequency. The maximum
achievable gain in this mode is 165 dB. The On Channel Repeater transmits on the receive frequency
making the Channel Module transparent to the user. The maximum achievable gain in the OCR mode is
150 dB.