Using software defined radios I can generate and demodulate a DVB-S2 signal live. I'm wondering if I can use this to send single pictures over the air using as narrow BW as possible. Using QPSK and a symbol rate of 1 MSPS the signal is about 1 MHz wide, which isn't very practical. If I reduce the symbol rate, will the signal occupy less bandwidth?
I've heard that 2 days in the lab can save 2 hours of reading but in this case it turned out to be easy to test. It is the sample rate of the SDR which changes the bandwidth of the signal. Since I am using the PLUTO SDR I can't go below around 500ksps. So I tried with a symbol rate of 300 kbaud at a sample rate of 600k. Able to demod successfully. I asked because I thought this would be harder to figure out but I'll leave it for reference.