[hpsdr] Janus problem; difference of 6dbFs between left and right in powersdr.

[Johan Maas]

Hi All,

I found a bug in the software...

Iam using the latest powersdr version from svn rev 2321.

When setting the samplefreq to 192Khz there is no difference between the two channels. But setting the sample freq to 48Kc or 96 Kc there is a difference.

Are there others with the same problem?

73 Johan PA3GSB



  ----- Original Message ----- 
  From: Johan Maas 
  To: hpsdr at lists.hpsdr.org 
  Sent: Wednesday, June 18, 2008 7:03 PM
  Subject: Janus problem; difference of 6dbFs between left and right in powersdr.


  Hello All,

  Iam testing a homebrew ISD , looking with rocky (via on board soud card) the output of both channels is equal.

  But looking to the PowerSDR and using Janus i have a difference of 6db between the channels.

  I have been measuring on the input with a scoop; i found a difference on JP6 and JP3. JP3 shows signal and JP6 not!

  When looking to the schematic (a PDF of scheme (2006042101)  XC11 ) i see difference in the circuit description between the two channels:

  - JP3 is directly connected to the ADC
  - JP6 is connected via R26 to the ADC
  - JP6 is connected via R26 to the ADC
  - JP3 is connected via R12 and R6 to the ADC

  Is the drawing wrong? But where does the difference come from?

  Hope someone an help?

  73 Johan PA3GSB
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