User's Manual

U
SER
´
S MANUAL FOR BAND SELECTIVE REPEATERS
MR
X
03P
User'sManual.doc Id.-No.:154999 Page 13 22-Jan-01
2.3.3. Conversion Module
The task of the conversion module is to amplify the received signals and to convert
them into an intermediate frequency. Then, the signals proceed a filter stage
comprising of highly selective filters and run through a digital controllable attenuator.
figure 2-3 Conversion module
Each link of a conversion module is provided with filters which guarantee the high
selectivity. There the desired bandwidth and the desired centre frequency can be set.
By using the same synthesizer frequency, that was used to convert the signals down
to intermediate frequency, the intermediate frequency is mixed up to the original
frequency. The synthesizer is controlled via an I
2
C-Bus.