Re: [Discuss-gnuradio] Quadrature demodulator update

[Stephane Fillod]

On Tue, Feb 11, 2003, Tanner Lovelace wrote:
> On Tue, 2003-02-11 at 03:33, Ian Wraith wrote:
> > Hello
> >       Just a quick update on my little quadrature demodulator project
> > which all being well will enable me to do some GNU Radio development. It
> > takes a low level 10.7 MHz IF from a receiver amplifies this with a
> > MSA-0886 MMIC then demodulates this with a RF2711 quadrature demodulator
> > IC from RF Micro Devices. The I & Q outputs of the RF2711 turned out to be
> > rather low level so I used a pair of OPA340 single supply op amps to
> > amplify them to a reasonable level. These signals are then feed into the
> > stereo inputs of my soundcards line input.
> >
> Any chance you could post the circuit plans here?
> 
> Thanks,
> Tanner Lovelace


For those looking for a 455kHz I&Q downconverter, here's the page of a
friend of mine F4DWV, using HEF4066 as mixer, HEF4013 and 74LS04 as
quadrature oscillator and a OP249 as Opam:

        http://thierry.leconte.chez.tiscali.fr/demod.html

hope it helps

73,
Stephane