[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Discuss-gnuradio] RFX 2400 daughter board: emission
From: |
sylvain poulenard |
Subject: |
[Discuss-gnuradio] RFX 2400 daughter board: emission |
Date: |
Thu, 17 Mar 2011 23:59:30 +0100 |
USRP emission problem:
I do not understand the FFT of my spectrum analyzer connected to an USRP that emitted a cosine signal source at 10kHz through a USRP sink centred on 2.464GHz (see figure emission_calibration.png )
Indeed, I got three peaks at:
f =2.464 GHz
f =2.468 GHz
f =2,472 GHz
Moreover the power emitted should be typically around 50mW, 17dBm, but I catch -43dBm after a cable of loss = 1,6dB
If I receive on another USRP, the result of the FFT on the computer is on figure "FTT_result_USRP_source.png"
The FTT on the computer seems to be right, even if I do not catch the order of magnitude of the FFT ordonnee.
To sum up, I have three questions:
- Why three peaks on the spectrum analyser?
- Power emitted?
- What is the scale of the FTT ordonne?
I am stuck, so thank you very much for your help
FTT_result_through USRP_source.png
Description: PNG image
emission_calibration.png
Description: PNG image
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- [Discuss-gnuradio] RFX 2400 daughter board: emission,
sylvain poulenard <=