[Elecraft] Understanding the KX3 Block Diagram

[Wayne Burdick]

Dave,

Let me assure you that the KX3 has a strong front end. The numbers  
will bear this out when we release them later this month.

This is a zero-I.F. receiver, like many other SDRs. But that doesn't  
imply "weak", as long as the gain distribution is optimized and a  
strong mixer is used. In addition, we go beyond other SDRs to include  
roofing filters in the balanced I/Q path (the KXFL3 option).

Please take a look at the Theory of Operation section, which goes into  
further detail. There's also a glossary.

73,
Wayne
N6KR

On Mar 7, 2012, at 7:19 PM, David Stratton wrote:

> Hoping that I may not be the only Ham puzzled by the block diagram  
> of the
> KX3 I am asking that someone please explain it because it is so  
> different
> from the superheterodyne radio concept I have become accustomed to in
> current amateur radios. I understand direct conversion radios but  
> what is
> all the stuff that's there besides the mixer-oscillator and audio  
> amplifier
> needed by a direct conversion radio? It seems to me the KX3 block  
> diagram
> looks a lot like radios put forth some time ago by Rick Campell  
> KK7B. Pardon
> my saying so but the KX3 radio looks like it has a weak front end  
> and a
> heavy back end that hopes to make up for the weak front end!
>
> Dave - KO4KL
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html