Jim,
I omitted to add this thought in my e-mail to you.
There is an alternative to the usual type of single down conversion and
double (up - down) conversion receiver, which is a single up-conversion
receiver using a lowish VHF IF and detector. The benefits of up-conversion
are then available from a relatively simple architecture. Certainly the cost
of good narrowband VHF filters remains, but it is offset to a large extent
by the removal of a second IF and its filters. Who knows, the cost of good
VHF filters could well come down if more were used.
73,
Geoff
GM4ESD
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