osmo-fl2k baseband to carrier

azerty lr azerty_lr at hotmail.com
Wed May 2 19:10:48 UTC 2018


Hello,

Ok so the Gnu Radio diagram that I did is correct? I tried a carrier frequency of 1 Mhz with a sampling rate of 31 Mhz of I should have got a signal at 30Mhz but it was not working very well. I needed a carrier of at least 2 Mhz to got a signal.

Best regards,
Jean-Paul
________________________________
De : Müller, Marcus (CEL) <mueller at kit.edu>
Envoyé : mercredi 2 mai 2018 12:42
À : azerty_lr at hotmail.com; osmocom-sdr at lists.osmocom.org
Objet : Re: osmo-fl2k baseband to carrier

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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