Whatever the bandwidth of the roofing filter is, ALL signals within that
bandwidth are applied to the 1st IF. Again, in extremely high density
situations, where you may have a dozen or more VERY strong signals
within that passband, the 1st IF has to be able to handle that total
level without distortion or cross modulation, or ...
Yes, you can always reduce the bandwidth of the receiver 'later' in the
IF, but you can not increase it beyond the bandwidth of the roofing filter.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Neil M Califano wrote:
So is the purpose of the roofing filter simply to make the final selectivity
easier to accomplish with less interference getting through the final filter?
Also, it seems the final bandwidth could not be wider than the roofing filter's.
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