[hpsdr] Odyessey-Siren Rev B.

[Ahti Aintila]

Graham,

Thank you for reminding. I forgot that I'm using two SPDT switches or
actually four switching transitions. Same as in the 90 degree
solution.

However, I need more time to think and understand Dan's explanation.

I have not measured the carrier leak, but that should be easy to
control with a careful and balanced construction of the circuit. The
switches seem to be very well balanced.

73, Ahti OH2RZ


On 19/12/06, Graham Haddock <grahamh at verizon.net> wrote:
>
> The number of switching transitions are the same for 180 degrees
> and 90 degrees sampling, that is, one ON and one OFF per cycle.
> The only difference being how long the time between ON and OFF.
>
> Your circuit may have an advantage on the transmit side,
> because of the differential transformer.  Have you made
> any measurements of the (switching) carrier leak through
> on this design?  As compared to the original QSE design?
>
> My best regards, --- Graham / KE9H
>

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