[hpsdr] Janus Lives!!

[Gerald Youngblood]

Bob and Phil,

I agree that this looks very nice.  However, the CS5381 looks virtually the
same as this in 48 and 96 kHz modes.  The key is how does the AKM part look
in 192 kHz mode when it is accurately calibrated and the display is in SPEC
mode.  I expect it to be good but that will tell the real story.  

73,
Gerald

Gerald Youngblood, K5SDR
FlexRadio Systems
Ph: 512-535-5266
Fax: 512-233-5143
Email: gerald at flex-radio.com
Web: www.flex-radio.com
 

> -----Original Message-----
> From: hpsdr-bounces at hpsdr.org 
> [mailto:hpsdr-bounces at hpsdr.org] On Behalf Of Robert McGwier
> Sent: Monday, July 03, 2006 12:15 PM
> To: Phil Harman; High Performance Software Defined Radio 
> Discussion List
> Subject: Re: [hpsdr] Janus Lives!!
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> 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
> >
> >
> >
> >
> >
> >
> >
> >
> >   
> 
> 
> --
> 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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