[hpsdr] Phoenix Rises

[Ahti Aintila]

> At 05:29 PM 1/23/2008, Richard Hosking wrote:
> >***** High Performance Software Defined Radio Discussion List *****
> >
> >The current layout can be viewed at
> >http://hpsdr.org/wiki/index.php?title=PHOENIX
> >I would be interested in comments and corrections
> >
> >Richard Hosking VK6BRO

Congratulations Richard!

Your PHOENIX Schematics look great. I think your selection of
components (74AUC2G53 and OPA1632) for the mixer is a very balanced
compromise between the dynamic range and the component count. Thanks
also to Marco IK1ODO who improved the basic draft by adding the
"diplexer" components at the inputs of the fully differential opamp.

May I suggest some changes? When used together with Janus, we don't
necessarily need ±10 V supply for the opamps. Possibly ±5V (or even +5
V) would be enough for the 2.4 Vpp inputs of the  AK5394A. Due to the
low noise figure of the ADC, maybe, also the gain of the opamps could
be slightly reduced for better strong signal capability.

It is a very tempting suggestion to be an alpha tester, but because of
some commercial projects, I must accept my situation as a lurker on
the side and wait for the ready made board.

73 and many thanks,
Ahti OH2RZ

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