Scott,
By your definition of an SDR, that may be true.
Some SDRs today are direct sampling at the antenna, but think back to
SDRs in the recent past when high frequency direct sampling was only
achieved at great cost - the simplest example is the SoftRock 40 which
used a quadrature mixer to baseband.
I think most would say the Softrock is an SDR.
73,
Don W3FPR
On 12/22/2017 1:53 PM, K9MA wrote:
On 12/22/2017 11:37, Don Wilhelm wrote:
Of course, the KX2 is *not* a superhet, it is a full SDR. If the "IF"
were at a higher frequency, the VFO would be further away from the
signal frequency - by the frequency of the IF.
I must disagree. All the digital processing takes place after the
quadrature mixers. Up to that point, it IS a single conversion
superhet, but with two mixers with quadrature outputs. The same is true
of the KX3, though it can be operated as a direct conversion receiver,
which is simply a superhet with a zero frequency IF.
This is in no way meant to disparage the design of the KX2 or KX3: They
are truly excellent radios.
73,
Scott K9MA
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft@mailman.qth.net
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to arch...@mail-archive.com
