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[Discuss-gnuradio] Problems of lost of BINS

From: Milo Wong
Subject: [Discuss-gnuradio] Problems of lost of BINS
Date: Wed, 16 Sep 2009 11:34:38 -0700
User-agent: Thunderbird (X11/20090817)

Hi folks,

I have implemented a multi sub-carriers AM transmitter and here I still have a strange problem: I plotted the FFT of the modulated signal at baseband (as attached) and the number of the bins (spikes) I have on the plot was exactly the same as the number of the sub-carriers as I set in the program. This is correct so far as I know. But after the signal was tuned to 2.45GHz by USRP, the number of the bins(spikes) on my spectrum analyzer was not the same, which is only 4 or 6. While I have 20 sub-carriers at different frequencies and it seems that I lost most of them after the signal was tuned to RF. Is there anybody who knows the reason behind that? I have been stuck at here for a long time. Any helps or suggestions will be greatly appreciated.



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