Re: KX2/3 DSP AM Demodulation
Posted by
K9MA on
Sep 10, 2017; 2:46am
URL: http://elecraft.85.s1.nabble.com/KX2-3-DSP-AM-Demodulation-tp7634311p7634314.html
On 9/9/2017 21:35, Fred Jensen wrote:
> A DC receiver converts the signal once to audio. Regardless of the
> mechanics [which these days can get very complex], that's really all
> there is.
Ah, but the only way direct conversion can convert AM to audio, without
some kind of fancy DSP stuff, is to phase lock the conversion oscillator
to the carrier. My KX2 doesn't sound like it's doing that when I tune
across a signal; it sounds more like a conventional superhet AM
receiver. I'm trying to figure out how you take the I and Q mixer
baseband ("audio") outputs of an AM signal and convert them to audio,
and in a way that works when the carrier is not exactly zero beat.
73,
Scott K9MA
--
Scott K9MA
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