[Discuss-gnuradio] FSK transmitter tutorial

[Murray Thomson]

Hi,

I would like to build an FSK modulator/demodulator. I'm using file
sink/sources for the moment. I need to be able to specify the two
frequencies, baud rate and sample rate (ideally at runtime).
I started with the gr-tutorial for qpsk, hoping to replace the
modulation/demodulation with gfsk blocks, but I didn't get the result I was
hoping for. I don't fully understand the gfsk module or how to change the
frequencies after the modulation. I tried the fsk burst modem example, but
it's not what I want. I would rather not use PDUs and I don't want to
transmit in bursts.
I would really appreciate if someone could point me to a tutorial or
example on this. These are the resources I have read so far:

https://github.com/gnuradio/gr-tutorial/blob/master/examples/tutorial7/mpsk_stage6.grc
https://nccgroup.github.io/RFTM/fsk_transmitter.html
https://www.reddit.com/r/GNURadio/comments/3u5zp2/gnu_radio_gfsk_modulation_rate_deviation/
http://www.indigresso.com/wiki/doku.php?id=opentag:radios:testing_with_gnuradio
https://oshearesearch.com/index.php/2015/05/31/building-a-burst-fsk-modem-in-gnu-radio-with-message-lambda-blocks-and-eventstream/

Many thanks,
Murray

[Dan CaJacob]

Check out the FSK : Digital section of
https://wiki.gnuradio.org/index.php/SignalProcessing Shows you how to set
up some variables you'll need. Freq modulator and quadrature demodulator
are important. So is filtering.

Post by Murray Thomson
Hi,
I would like to build an FSK modulator/demodulator. I'm using file
sink/sources for the moment. I need to be able to specify the two
frequencies, baud rate and sample rate (ideally at runtime).
I started with the gr-tutorial for qpsk, hoping to replace the
modulation/demodulation with gfsk blocks, but I didn't get the result I was
hoping for. I don't fully understand the gfsk module or how to change the
frequencies after the modulation. I tried the fsk burst modem example, but
it's not what I want. I would rather not use PDUs and I don't want to
transmit in bursts.
I would really appreciate if someone could point me to a tutorial or
https://github.com/gnuradio/gr-tutorial/blob/master/examples/tutorial7/mpsk_stage6.grc
https://nccgroup.github.io/RFTM/fsk_transmitter.html
https://www.reddit.com/r/GNURadio/comments/3u5zp2/gnu_radio_gfsk_modulation_rate_deviation/
http://www.indigresso.com/wiki/doku.php?id=opentag:radios:testing_with_gnuradio
https://oshearesearch.com/index.php/2015/05/31/building-a-burst-fsk-modem-in-gnu-radio-with-message-lambda-blocks-and-eventstream/
Many thanks,
Murray
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[Ron Economos]

I have a RTTY flow graph that you may find useful as a starting point.
It's transmit only (I was just using it to test the RTTY decoder on the
ICOM IC-7300 ham transceiver).

http://www.w6rz.net/rtty.grc

And a program to generate a baudot test file from a text file.

http://www.w6rz.net/baudot.c

Ron

Post by Murray Thomson
Hi,
I would like to build an FSK modulator/demodulator. I'm using file
sink/sources for the moment. I need to be able to specify the two
frequencies, baud rate and sample rate (ideally at runtime).
I started with the gr-tutorial for qpsk, hoping to replace the
modulation/demodulation with gfsk blocks, but I didn't get the result
I was hoping for. I don't fully understand the gfsk module or how to
change the frequencies after the modulation. I tried the fsk burst
modem example, but it's not what I want. I would rather not use PDUs
and I don't want to transmit in bursts.
 I would really appreciate if someone could point me to a tutorial or
https://github.com/gnuradio/gr-tutorial/blob/master/examples/tutorial7/mpsk_stage6.grc
https://nccgroup.github.io/RFTM/fsk_transmitter.html
https://www.reddit.com/r/GNURadio/comments/3u5zp2/gnu_radio_gfsk_modulation_rate_deviation/
http://www.indigresso.com/wiki/doku.php?id=opentag:radios:testing_with_gnuradio
https://oshearesearch.com/index.php/2015/05/31/building-a-burst-fsk-modem-in-gnu-radio-with-message-lambda-blocks-and-eventstream/
Many thanks,
Murray

[Murray Thomson]

Thank you all for your help. It's a good starting point for what I need.

Post by Ron Economos
I have a RTTY flow graph that you may find useful as a starting point.
It's transmit only (I was just using it to test the RTTY decoder on the
ICOM IC-7300 ham transceiver).
http://www.w6rz.net/rtty.grc
And a program to generate a baudot test file from a text file.
http://www.w6rz.net/baudot.c
Ron

Post by Murray Thomson
Hi,
I would like to build an FSK modulator/demodulator. I'm using file
sink/sources for the moment. I need to be able to specify the two
frequencies, baud rate and sample rate (ideally at runtime).
I started with the gr-tutorial for qpsk, hoping to replace the
modulation/demodulation with gfsk blocks, but I didn't get the result I was
hoping for. I don't fully understand the gfsk module or how to change the
frequencies after the modulation. I tried the fsk burst modem example, but
it's not what I want. I would rather not use PDUs and I don't want to
transmit in bursts.
I would really appreciate if someone could point me to a tutorial or
https://github.com/gnuradio/gr-tutorial/blob/master/examples
/tutorial7/mpsk_stage6.grc
https://nccgroup.github.io/RFTM/fsk_transmitter.html
https://www.reddit.com/r/GNURadio/comments/3u5zp2/gnu_radio_
gfsk_modulation_rate_deviation/
testing_with_gnuradio
https://oshearesearch.com/index.php/2015/05/31/building-a-
burst-fsk-modem-in-gnu-radio-with-message-lambda-blocks-and-eventstream/
Many thanks,
Murray

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