Alberto & Guido,
The only think I can think of is sampling at 4 times the normal speed
and generating I Q signal from 4 samples ( Q = S(n+0)-A(n+2),
I=S(n+1)-S(n+3) ). Never tried it, and you will need a 4 times faster
ADC (switching hardware is cheaper?)
73, Fred
PE0FKO
i2phd wrote:
--- In [email protected]
<mailto:soft_radio%40yahoogroups.com>, Guido <[EMAIL PROTECTED]> wrote:
>
> A while ago there was this interesting idea by Phil Covington where
> only one audio channel is required for implementing a kind of QSD;
> called RMSD. The idea was posted as a SoftRock SuperLite idea where
> only a single switch does all the mixing and image rejection. At the
> time of posting, questions where raised how the image rejection
> would work and the idea was maybe misinterpreted and not fully
> understood. Did anybody solve the puzzle?
>
> 73, Guido
Guido, I would like to be proved wrong, as that would mean a progress
in the SDR field, but, lacking further explanations or evidences, I am
convinced that it can't work.
But, as said, let's hope that Phil himself would give more
explanations instead of thinking about exploiting commercially that
idea, as he said he was intending to do...
73 Alberto I2PHD
