> Okay David,
>
> The switching supply will be designed such that is can be disabled and
> bypassed with a switch/jumpers during normal operation.

I agree that it'd be great to get it working without the SMPS first. Then
see how much worse it gets with the SMPS. In the IR receiver I linked to
before, I used an LTC dual boost converter to get 2-3V battery up to 3.3V
for the PIC and 7V for the LCD. The power supply is on the same PCB as the
PIC. The receiver is on a separate board with heavy RF filtering on the
lines between the two.

More on SDR, the Kiwi SDR at http://kiwisdr.com/KiwiSDR/index.html looks
interesting. It's only a 14 bit ADC, but listening to some of them around
the world, it seems to work pretty well. I imagine a tuned front end would
make it work better, but then you could not have multiple users listening
to multiple frequencies.

Harold





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