AE04B-A0279 Rev -- FUNCTIONAL DESCRIPTION
Document use is restricted to that described on cover
3-2
3.2.3.2 Upconverter
The upconverter board mixes the filtered 70 MHz IF with a signal from the synthesizer and outputs the same
frequency that was input to the downconverter. The upconverter consists of a SAW filter centered at 70
MHz with a 1.5 MHz or 5 MHz 3 dB bandwidth, depending on the part number ordered, a mixer and gain
stages. The DC current draw of each gain stage is monitored by a window comparator. The window
comparator indicates a fault, if the gain stage has an open or short condition.
LNA/
ATTENUATOR
LNA/
ATTENUATOR
CHANNELIZER
CHANNELIZER
5 WATT
POWER AMP
10 WATT
POWER AMP
POWER SUPPLY
INTERCONNECT BOARD
POWER/
CONTROL BUS
POWER/
CONTROL BUS
DOWNLINK
FILTER
UPLINK FILTER
DOWNLINK
FILTER
UPLINK FILTER
DIPLEXER
DIPLEXER
TO
ANTENNA
TO
ANTENNA
Figure 3-1 SelectAmp800 Block Diagram
