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From: | Kyeong Su Shin |
Subject: | Re: [Discuss-gnuradio] wx_fft_sink block |
Date: | Sat, 3 Feb 2018 21:43:26 +0900 |
Kyeong Su ShinRegards,You cannot get absolute power level readings from USRPs unless you calibrate them amplitude-wise (by yourself). Even then, USRP is not a perfect replacement of a spectrum analyzer (generally better than cheaper SDRs, though).Hello Abhilash,That is because the power level is relative. Unless you use a absolute power level (dBm/Hz, etc), the comparison of the power level magnitude is meaningless. The spectrum analyzer is probably giving you dB'm' readings, but the USRP is not.On Fri, Feb 2, 2018 at 2:39 PM, abhilash b <address@hidden> wrote:______________________________Hello,I am using USRP N210 with CBX daughter board.In the GNU radio I use USRP_source block followed by wx_gui_fft sink block. I input a power of -60dB to the USRP. The input power is measured using a spectrum analyzer.The RF gain in the source block is kept at 0 dB, sample rate of 25 MHz and center freq of 2.4 GHzBut the fft block shows the power to be -40dB.Could you please tell me why such a huge offset.---Regards
Abhilash B_________________
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