Well, as a VGA adapter, the FL2000 doesn't come with any mixer. So, all you can do is use images, since the DAC also lacks a proper reconstruction filter. You get mathematical repetitions at every multiple of the sampling rate – "undersampling" is the the term you want to read up on.
Best regards, Marcus On Tue, 2018-05-01 at 12:03 +0000, azerty lr wrote: > Hello, > > First thank you for this FL2000 hack, it's very nice! > > I tried to make an FM & AM transmitter with it and GNU Radio. It's working > fine if I save to a file and then use fl2k_file to transmit the data but with > the tcp server and fl2k_tcp, my computer is not fast enough to sample in real > time at 100 MHz. I also tried with a 35 Mhz sampling rate but it's not real > time. Here is the diagram I used. > > Is there a possibility to avoid sampling at a very fast rate if the data > bandwidth is small to do the baseband to carrier shift? > > > Thank you, > Best regards, > Jean-Paul
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