"Steve Nosko" wrote in message
...

Low IF for reduced BW can be done in any radio, but size and Q
and frequency are not independent, so lower freq IF means bigger coils and
more "R", so "same Q - lower IF" is not that simple.

It must be a couple of decades since IF bandwidth depended on "real" IF
coils and their Q. Since then mechanical [ceramic] filters have set the
bandwidth of essentially all consumer radios known to me. OK there are now
a few high-end DSP-based radios. Those too-narrow IFs in today's AM radios
come from ceramic filters, not low freq IF.