[hpsdr] Janus Lives!!

[Robert McGwier]

Phil:

The results look spectacular but they cannot be calibrated yet.   The 
meter and spectrum are inconsitent so until they are calibrated, we do 
not know that the noise floor really is.  BUT, the cleanliness is 
absolutely not in question.  This looks spectacularly clean.   This is 
much cleaner than the CS5381 from all sources where I have seen 
measurements.

Nice job!

Bob



Phil Harman wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> All,
>
> I've just completed the CPLD software for the Alpha Janus board and the 
> results are spectacular.
>
> The image below is of the Janus sampling at 48kHz.  As you can see the noise 
> floor is at a spectacular -159dBm (it actually hovers around -160dBm but 
> that is when I captured the screen). As you can see there are absolutly no 
> spurs in the passband.
>
> The file name is "Janus noise floor.jpg"  for those that have a problem with 
> getting files from www.hamsdr.com
>
> http://www.hamsdr.com/personaldirectory.aspx?id=348
>
> The second screen shot is at 48kHz in spectrum mode. Again no spurs and the 
> signal at 0Hz is -120dBm. This drops below the band noise when I connect the 
> SDR1000 hardware.
>
> http://www.hamsdr.com/personaldirectory.aspx?id=349
>
> The file name is "Janus spectrum.jpg"
>
> I still have some more tests to do as well as testing  at 96/192kHz but so 
> far all is looking great.
>
> There are a small number of minor changes to the prototype PCB which will be 
> addressed shortly.  My sincere thanks to Lyle KK7P for doing such a great 
> job on the PCB design, Bill KD5TFD for the PowerSDR software modifictions so 
> Janus will work with it and help with the Verilog coding and all those who 
> helped me up the FPGA learning curve.
>
> Onwards to OZY!!
>
> 73's Phil...VK6APH
>
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-- 
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Time for a new motto, what should I choose?


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