BBC Module Functional Description
The BBC Module is to be used in conjunction with the Ka/Ku Out-Door Unit (ODU, or "dish" if you will) and the A3/MPEG-4 capable satellite receiver, hereafter to be called "the IRD". The Ka/Ku ODU output will consist of a three-way stacked signal: a Ka Lo-band (B Band) at 250-750 MHz, a Ku band at 950-1450 MHz and a Ka Hi-band (A band) at 1650-2150 MHz. The IRD has an input range of 950-2150 MHz so an up-converter must be used in order to access the 250-750 MHz spectrum. Failure to install a BBC Module at the back of the IRD prevents the IRD from receiving Ka Lo-band. For clarity, a BBC Module must never be used in a system that contains a Frequency Translation Module (FTM, now known as a Single Wire Multiswitch) as the equivalent function is already contained in the FTM.
The BBC Module up-converts the Ka Lo-band from 250-750 MHz into 1650-2150 MHz and sends the up-converted signal to the IRD.
In its simplest application, the BBC Module is connected to the "Satellite Input" of the IRD at the back of the IRD, between the IRD and the Ka/Ku ODU (Fig. 1).
When the IRD selects the A Band of 1650-2150 MHz, the BBC Module passes the signal from 950-2150 to the output. So the 950-2150 MHz output consists of the original Ku band and the A Band.
When the IRD selects the B-Band of 250-750 MHz, the BBC module up-converts the B Band to 1650-2150 MHz and send the up-converted signal to the output. So the 950-2150 MHz output consists of the original Ku band and the up-cinverted B Band.
DC voltages/current and ODU/multi-switch control signals pass through the BBC Module as is. Upon power up, the BBC Module is always in the A Band mode (un-switched mode).
If a 250-2150 MHz wide-band 6x8 multi-switch (WB68) is used. It will be located between the BBC Module and the Ka/Ku ODU (Fig. 2)