[Elecraft] Up-conversion.

[Geoffrey Mackenzie-Kennedy]

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