Hi Anthony, It's not clear to me if you are trying to implement an FSK transmitter for data or an FM transmitter for audio with the samples coming from another application. If you can clarify, perhaps I can be of some help.
Adrian On July 3, 2020 3:56:26 PM UTC, "Anthony B." <[email protected]> wrote: >Hello Kevin, > >Thanks, your link had useful information about the principles to >consider >with a vector source. > >Considering the following generic flowgraph : Vector Source > Repeat > >Multiply (with a sine wave) > Resampling / Filtering > Output (?) > >I have seen that most of the variables are related to the Morse code >transmission with the words per minute. However, I was wondering about >how >to tune the interpolation rate of the Repeat block after the Vector >source >for a known bit sequence, but out of the Morse standard. I would also >expect some kind of periodic signal, if not an audio signal, at the >input >of the FM transmitter (I guess). What would you expect as a clean >signal at >the input of the FM transmitter (output here), if not an audio signal ? > >I am also wondering about how to set the cut off frequency and >transition >width of the low pass filter in these flowgraphs. Is it by hand, or is >there a relationship with the flowgraph variables ? > >Thanks for your feedback! > >Anthony > >Le jeu. 2 juil. 2020 à 18:39, Kevin McQuiggin <[email protected]> a écrit >: > >> >> >https://hackaday.com/2020/04/14/pluto-might-not-be-a-planet-but-it-is-an-sdr-transceiver/ >> >> Whoops! Here is the link! >> >> On Jul 2, 2020, at 9:36 AM, Anthony B. <[email protected]> >wrote: >> >> Hello, >> >> Thanks for the answers! >> >> Is it this project ? >> https://github.com/duggabe/gr-morse-code-gen >> >> I'm gonna check it out, but it looks like the idea is in there, >thanks! >> >> Anthony >> >> >> >> >> Le jeu. 2 juil. 2020 à 18:21, Alex Humberstone < >> [email protected]> a écrit : >> >>> Hey Kevin, I don't see the link that you mentioned, did you forget >to >>> include it? >>> >>> >>> On Thu, 2 Jul 2020 at 11:18, Kevin McQuiggin <[email protected]> >wrote: >>> >>>> Hi Anthony: >>>> >>>> Check out this link. The author is using a Pluto but he developed >a >>>> flowgraph to transmit a vector that represents Morse code. Pretty >>>> well-explained. The ideas you need are likely in there. >>>> >>>> Kevin >>>> >>>> >>>> > On Jul 2, 2020, at 8:40 AM, Anthony B. <[email protected]> >wrote: >>>> > >>>> > Hello all, >>>> > >>>> > I am trying to build a very simple FM Transmitter using a >flowgraph as >>>> a reference. The principle is the following : >>>> > Signal source of 48 kHz Sample Rate > Rational Resampler up to >360 >>>> kHz Sample Rate > Add Constant 1 > VCO at 360 kHz with a carrier >frequency >>>> at 120 kHz. >>>> > >>>> > What I am trying to do right now is to replace the signal source >with >>>> a vector of bits coming from another application to then modulate >it with >>>> FM. >>>> > I've seen many examples of this kind of transmitter with audio >input, >>>> but I don't understand how to pass it a vector of bits and to get >the >>>> expected result. >>>> > Is there something I should consider before going to the VCO ? Is >the >>>> principle only working with periodic signals as input ? >>>> > >>>> > Thanks for your help! >>>> > >>>> > Anthony >>>> >>>> >>> >>> -- >>> Sincerely, >>> Alex-M-Humberstone >>> PhD Student >>> Klipsch School of Electrical Engineering >>> New Mexico State University >>> Las Cruces, New Mexico >>> >>> >>
