Re: [K3] Diversity Reception and Antenna Directivity

Posted by David Woolley (E.L) on Sep 17, 2010; 6:40am
URL: http://elecraft.85.s1.nabble.com/K3-Diversity-Reception-and-Antenna-Directivity-tp5537531p5541570.html

Of course the K3 has already done most of this, and then thrown Q away
at the last minute.  The upconvert is, of course, done by the transmitter.

Alan Bloom wrote:

> The other way to get the I/Q signals is with an I/Q modulator.
> Basically you run the baseband audio signal into two mixers whose local
> oscillators are 90 degrees out of phase.  Now you have two RF signals 90
> degrees out of phase.  If you convert them back to baseband with the
> same oscillator you get two audio signals 90 degrees out of phase and
> can combine them as before.  You then combine that signal with the
> original to simulate rotation of the directional antenna.
>


--
David Woolley
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