[hpsdr] Odissey QSD circuit diagram

[Philip Covington]

On 9/29/06, Giancarlo Moda <i7swx at yahoo.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi all,
>
> following my previous message I like to report the
> following reference where you can see my idea of a QSD
> using FST3125. The output should be adapted to the
> ODISSEY QSD differential amplifiers.
>
> http://it.groups.yahoo.com/group/Ciao_Radio_newsgroup_/files/
> then look at I7SWX QSD_06_06_comm.pdf
>
> 73
>
> Gian
> I7SWX
>

Unfortunately, this circuit is not an improvement over the QSD used in
the SDR-1000 or the SoftRocks. There is the problem with using passive
integration - the input impedance is all over the place depending on
whether you are in band or out of band.

Phil N8VB

 1159559800.0