https://forums.radioreference.com/threads/so-what-is-the-technical-issue-with-decoding-simulcast.393155/page-2#post-3193428
mention of I/Q here re simulcast systems vs good scanners
On Fri, Sep 27, 2019 at 7:39 PM Peter Szerlagi <zerg90@gmail.com> wrote:
>
> https://twitter.com/zerg90/status/1177727606457880576
>
> actually it is a basic explanation of how sdr radios work
>
> you set the dial at 1000 khz - then the signals mix that come into the
> radio - and you end up with baseband I/Q at 20 khz and minus 10 khz -
> simple addition and subtraction there
>
> this is the first time I have seen an explanation of baseband - let me
> regurgitate what I think I learned - we are interested in 3 AM signals
> - 1200 1000 990 - we mix those 3 signals with a 1000 signal - we get
> two new "mixture"signals - one at 200 - one at minus 100 - thats all
> there is to it
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