[Elecraft] Down or Up conversions designs

[Bill Frantz]

On 10/12/12 at 12:12 AM, n1al at sonic.net (Alan Bloom) wrote:

>Down conversion was universal before the late 1970s.  Then up conversion
>became the fad.  Now we're back to down conversion.

I look at the K3 as a "middle conversion" design. With the 8.215 
MHz IF; 160M, 80M and 40M are up converted and all the others 
are down converted. It works very well.

For a real down conversion radio, consider my old Hallicrafters 
SX-99. Everything is converted to a 455KHz IF which includes a 
crystal filter (I think one poll). It really doesn't do very 
well on image rejection. :-)

Cheers - Bill, AE6JV

---------------------------------------------------------------------------
Bill Frantz        |"Web security is like medicine - trying to 
do good for
408-356-8506       |an evolved body of kludges" - Mark Miller
www.pwpconsult.com |