[hpsdr] More Janus results

[Steve Nance]

Hey Phil,
 
Man it's looking really good. Can't wait to get all the pieces playing
together. Ought to make a really nice radio.
 
Kudos to You, Bill and Lyle for a job very well done.
 
73
Steve
 

  _____  

From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On Behalf Of
Phil Harman
Sent: Thursday, July 06, 2006 8:52 AM
To: hpsdr at hpsdr.org
Subject: [hpsdr] More Janus results


I've now completed testing the prototype Janus board at both 96k and 192k
and the results are very good.
 
This image is at 96kHz  (Janus 96.jpg)
 
http://www.hamsdr.com/personaldirectory.aspx?id=351
 
and this at 192kHz (Janus 192k.jpg)
 
http://www.hamsdr.com/personaldirectory.aspx?id=352
 
What is really pleasing is at 192k there is no sign of the 48k clock feeding
the TLV320 Codec which was a problem with my breadboard. The total lack of
spurs is a credit to Lyle's PCB layout skills!
 
By using the automatic calibration function on the AK5394A chip I've also
been able to reduce the DC offset by a futher 10dB. 
 
All the other Janus board functions check out OK so looks like we have a
100% functional Alpha PCB.
 
73's Phil...VK6APH 
 
 
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