[Elecraft] KX3 and Quadarature down-sampling

[Johnny Siu]

Hello Alan,
 
I have limited knowledge of radio.
 
Is that the operation theory of quadarature down-sampling something similar to the image rejection mixer in the IC7800?
 
Excuse me if I ask a stupid question.

TNX & 73,


Johnny VR2XMC

從︰ Alan Bloom <n1al at sonic.net>
收件人︰ Gary D Krause <n7hts at bresnan.net>
副本(CC)︰ Elecraft <elecraft at mailman.qth.net>
傳送日期︰ 2011年07月26日 (週二) 11:08 PM
主題︰ Re: [Elecraft] KX3 and Quadarature down-sampling

On Tue, 2011-07-26 at 08:44 -0600, Gary D Krause wrote:
> I've been wondering what Quadarature down-sampling is?  This is the first that 
> I have heard of it.

It's like a two-channel direct-conversion receiver.  The two channels
are on the same frequency but use local oscillators that are 90 degrees
out of phase.  With suitable processing, the in-phase (I) and quadrature
(Q) mixer outputs give both the amplitude and phase of the signal.
Among other things, that makes it possible to suppress the unwanted
sideband of an SSB signal without a crystal filter.

Alan N1AL


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