> I have searched the posts on this but am still unsure of how to transfer the > data to PN.exe. I can find no native interface for ADC samples.
Yes, that's the dreaded "exercise left to the student." :) Currently there aren't any good plug-and-play solutions for baseband acquisition in either PN.EXE or TimeLab. When I first started to look into PN measurement, I planned to add support to PN.EXE (and later TimeLab) for quite a few baseband digitizer platforms. But as it turned out, I'm only just now getting around to that area. For what you're doing, you might check out Andrew Holme's experimental direct-digital project at http://www.aholme.co.uk/PhaseNoise/Main.htm . Andrew's digitizer isn't intended for use at baseband, but it will probably be easier to adapt his HDL and C code for use with a mixer and LNA than it will be to write something from scratch. Also consider a sound card with 192 kHz capability. It would be a good idea to look for a 192-kHz sound card whose input blocking capacitor can be removed easily. Another option might be the Digilent Analog Discovery 2, which can be used as a convenient open platform (or at least semi-open platform) for LF applications. Not too familiar with it myself, but I know it's become popular in audio circles. The next step up from that would probably be the Red Pitaya. Marco Gottardo has a book called (literally) "FPGA to High Speed ADC Data Streaming," which explores various data acquisition applications with the Red Pitaya including baseband noise measurement. I have a copy of this one that I haven't had time to look over in depth. The English is a bit rough in places, but the content seems worthwhile for anyone contemplating a Zynq-based digitizer. None of these options will bring data directly into PN.EXE, of course. But that's the easy part of the exercise compared to the general problem of data acquisition. -- john, KE5FX _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
