[hpsdr] 8 DDC Skimmer Receiver firmware for Mercury/Metis

[Richard Koch]

Hello list,

I've attempted to put some new life into my Atlas boards. I wanted to use
the Mercury / Metis pair to do some receiver skimming. I was able to get
8 DDCs working with one Mercury by using an NCO -vs- Cordic  (inspired
by the Hermes-Lite2 folks) and only using CIC filters in the DSP (no FIR).
It is also limited to a 0-30MHz range and is Protocol 2 based.

It seems to work pretty well for me and I thought I would put it out there
to share with the community, hopefully someone will find it useful.

I put the firmware up on the github TAPR site:
https://github.com/TAPR/OpenHPSDR-Firmware/tree/master/Protocol%202/Atlas/Skimmer_Receiver

-Rick / N1GP

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