Chris: AM is a double sidebanded signal. You didn't describe your circuit but is it direct conversion, i.e. is the carrier at DC in your circuit? If so, take EITHER the real or the imaginary, run it through a rectifier and filter with a low pass that cuts off at the audio bandwidth you want or slightly less. You will then have detected audio.
Bob [email protected] wrote: > Date: Thu, 25 Aug 2005 07:38:24 -0000 > From: "Chris Hirt" <[EMAIL PROTECTED]> >Subject: AM demod from I/Q in hardware > >Hi all >Perhaps my question is stupid, but I am momentary at the end of my >ideas. What the heck is the demodulation of AM if I have a I/Q signal ? >My homebrew HDR-2005 (= HardwareDefinedRadio 2005 ;-) is a mixture >between QRP2001, SDR-1000 and other concepts. It sounds great in SSB. >I demodulate LSB, USB or both but not AM. Yes, yes I know M = srt(I^2 >+ Q^2), but how I do it in hardware ! Up to now all my trials with AM >ended in much distortion. >Does anybody knows how I produce a clear AM from I and Q with (analog) >hardware? >Best regards >Chris > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
