I have a problem because I want to transmit string at certain frequency that is simple .png with 0 and 1. I simply take height and width of the image and scale it to the bandwidth and time. Then I multiply each pixel of the image by exp(-jwt). I'm getting complex signal which I'm passing to the pluto by function transmitRepeat. What I'm getting in gqrx by FFT is symmetric spectrum around my carrier frequency. What I want to receive is one string passing through carrier frequency. My lecturer adviced me to do SSB modulation and to prepare better spectrum before sending in order to take advantage of symmetrical spectrum but I didn't get it. I've done SSB by Hilbert transform but I haven't seen any difference in transmitted spectrum. Can someone explain it a bit more how could I achieve it?