we have question about gnu radio software. a week ago we run a simple transmit and receive operation of a sine wave and on the frequency sinks we saw a matching frequency. more over, we inserted a simple qt range module and we saw our signals moving on the frequency graph together.
now we run the same implementation and we send a good signal but receive non expected signal at all.
there is a weird signal in 0.019MHz and we send sine wave of 0.5MHz.
we use zedboard + fmcomms3.
the lines at the bottom
someone see the problem?