AnsweredAssumed Answered

N5182A + MXA9020 with N6153A DVB-T/H Measurement Application ...

Question asked by debugasm on Apr 2, 2013
Latest reply on Apr 9, 2013 by debugasm

Like • Show 0 Likes0
Comment • 4

Hi,

I have N5182A with N7623B with which I have generated a wave file DVB-T :

Fec : 1/2
Costellation : 64QAM
OFDM : 8K
Guard 1/32

With null packet loop file.

I made the internal IQ calibration and I have connected N5182A to MXA9020 with N6153A DVB-T/H Measurement Application and I obtain this :

!http://img203.imageshack.us/img203/1219/mxadvbtmeasure.png!

Why pilot BPSK is out of reference circle ?

Thanks very much.

debugasm

No one else has this question

Outcomes

4 Replies

tabbott Apr 3, 2013 8:43 AM
Mark Correct
Correct Answer
Hi -

I asked an Agilent support engineer to take a look at this. Here is the reply:

+This point is not a correct one. It may be caused by feed through of MXG. Please do DC calibration first, then try again. Or on SA side, turn off carrier 0 (start from carrier 1).+

I hope this helps -
Like • Show 0 Likes0
Actions
- debugasm @ tabbott on Apr 4, 2013 3:06 AM
  Mark Correct
  Correct Answer
  Hi,
  
  > This point is not a correct one. It may be caused by feed through of MXG.
  > Please do DC calibration first, then try again. Or on SA side, turn off carrier 0 (start from carrier 1).
  
  "Please do DC calibration first"
  
  !http://img411.imageshack.us/img411/9489/n5182adccalibration.png!
  
  and
  
  !http://img823.imageshack.us/img823/4716/n5182auserrangecalibrat.png!
  
  The carrier 3408 is still in error, but to a lesser extent.
  
  !http://img600.imageshack.us/img600/1056/mxan9020piloterror.png!
  
  Marker on 3408 :
  
  !http://img839.imageshack.us/img839/6522/mxan9020marker.png!
  
  debugasm
  Like • Show 0 Likes0
  Actions
  - tabbott @ debugasm on Apr 5, 2013 8:42 AM
    Mark Correct
    Correct Answer
    Hi debugasm -
    
    Here is our support reply:
    
    +It is caused by feed through of MXG. The number of carriers of 8K mode is 6817. So 3408 is exactly at the center.+
    
    +For some MXG, even after DC calibration, feed through is still there. The easy way is just to ignore this point, otherwise, maybe this MXG needs to be calibrated.+
    
    Regards -
    Like • Show 0 Likes0
    Actions
    - debugasm @ tabbott on Apr 9, 2013 2:16 AM
      Mark Correct
      Correct Answer
      Hi tabbott,
      
      > It is caused by feed through of MXG. The number of carriers of 8K mode is 6817.
      > So 3408 is exactly at the center.
      
      I already knew this issue.
      
      > For some MXG, even after DC calibration, feed through is still there. The easy way
      > is just to ignore this point, otherwise, maybe this MXG needs to be calibrated.
      
      I proceed to the calibration of MGX.
      
      Thanks very much.
      
      Best Regards,
      
      debugasm
      Like • Show 0 Likes0
      Actions

N5182A + MXA9020 with N6153A DVB-T/H Measurement Application ...

Outcomes

Related Content

Recommended Content