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6.0 IF MODULE
The built-in IF filter module, shown in Figure 8, has 8 SAW filters, ranging in bandwidth
from 250 kHz to 40 MHz in approximately one-octave steps. These filters serve as anti-
aliasing filters ahead of the A/D converter in the demod itself. In addition, they can provide
an added measure of adjacent channel interference rejection. The measured responses of
the 8 filters are shown in Figure 9 and Figure 10 (note the change of horizontal scale
between the two Figures).
Figure 8. 70 MHz IF Module in 2” x 3” Chassis.
The IF module attaches directly to the demod modules.
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