Hello everyone, I am trying to make two USRP communicate between each other : for the transmission, I'm using an HackRF One USRP and for the reception a NI 2921 USRP. As a first test, I'm trying to send different basic signals like sine waves, square waves, triangle waves,... with the HackRF One and receive it with the NI 2921 USRP at a carrier frequency of 2.43GHz. 1) Here is the block diagram for transmission, the time signal and FFT plot : Transmission pictures (block diagram + FFT + time signal) <https://photos.app.goo.gl/p9wuCYGHviSaV5cT7> I'm sending the signal at 2.43GHz with a sample rate of 200kHz. Here the signal sent is a composition of a real component which is a square wave at 15kHz and an imaginary component which is a cosine wave at 10kHz. 2) Here is the block diagram for reception, the time signal and FFT plot (once when I am not sending any signal and once when I am transmitting the composition of signals described above, such that we can see that the peak detected is well due to my emission) : Reception pictures (block diagram + FFT + time signal) <https://photos.app.goo.gl/m9eUAXxezY6wMDq66> I'm sampling at 200kHz and my center frequency is at 2.43GHz. Whatever the signal I'm sending (a DC signal, a sine wave, a triangle wave,...), I always get the same peak (and only one) like the one on the picture. Normally, I should receive the same FFT as the one showed at emission on the picture. I notice also that this peak is located at a weird position (2.43GHz + 46kHz) compared to the center frequency (2.43GHz) with no link with the frequency of the signals sent. Moreover whatever the frequency of the signal emitted, the peak will always be located at this same position as well. I seems like they manage to communicate between each other given that there is this peak appearing when I am transmitting the signals but I do not understand the logic behind the spectrum received.. Can somebody enlighten me?
Thank you for your precious time and your help, Dylan
_______________________________________________ USRP-users mailing list [email protected] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
