So, I've been thinking about my ideas with respect to a "universal" source block that would allow runtime selection of FCD, UHD, or RTL-SDR
  blocks.

Is it possible to specify a source block purely in Python using gr.hier_block2?

If so, then the Python code could construct and plug in the appropriate actual source block "under the covers", based on some yet-to-be-determined syntax at runtime. It could even use the conditional-importing goo in Python to decide whether you have any/all of the appropriate hardware-specific support configured in the build.


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org



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