[hpsdr] the world beyond 61.44 MHz

[Ken]

The Mercury will receive a 65 MHz signal - just try it. Power SDR must be tuning to the image (?)

But beyond this, I note that the ADC is good to 700 MHz and the driver amp to 1.8 Gz - the limiting component is the transformer which is good to at least 300 MHz. 

So - if you bypass (remove?) the low pass filter, you should be able to receive sampling-alias frequencies that cover 2m and 222 MHz and possibly even 70 cm. 

Has anyone tried this?

>From a theoretical point of view, how much degradation is to be expected in the higher Nyquist bands? 
(sensitivity/NF versus the 1-60 MHz range, for example)
Would an appropriate preamp restore performance to something acceptable?

Ken
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