Hi All!

Wheeew ... I played with sending FM Radio with RDS with an unmodified Raspberry
Pi. (Use GPIO pin to modulate a signal)
You have many, many harmonics, but it works basically.

Now somebody had even more sparetime on their hands: https://github.com/F5OEO/rpitx

rpitx is a radio transmitter for Raspberry Pi (B,B+ and PI2) which output directly to GPIO.
rpitx is the main software to transmit. It allows to transmit - from IQ files .iq (could be generated by external software like gnuradio or by some few examples of modulations). - from *Frequency/Time** files *.ft (generally used implement easily digital modes)
pissb convert an audio file (Wav 48KHZ mono only!) to SSB (USB right now) and output it on a IQ file.

Have not tried it ... but insane that it can be done ...

CU, Ricsi

--- GoldED+/LNX
* Origin: I'm usually awake near the end of the day (432:1/105)

Richard Menedetter wrote to All <=-

Hi All!

Wheeew ... I played with sending FM Radio with RDS with an unmodified Raspberry
Pi. (Use GPIO pin to modulate a signal)
You have many, many harmonics, but it works basically.

Yeah, never tried that one, but cute. :)

Now somebody had even more sparetime on their hands: https://github.com/F5OEO/rpitx

rpitx is a radio transmitter for

Now this is _really_ neat! :)


... Why's the man who invests all your money called a broker?
--- MultiMail/Win32 v0.49
* Origin: Freeway BBS - freeway.apana.org.au (432:1/101)

Hi Tony!

16 Jul 2016 17:56, from Tony Langdon -> Richard Menedetter:

Now somebody had even more sparetime on their hands:
https://github.com/F5OEO/rpitx
rpitx is a radio transmitter for

Now this is _really_ neat! :)

But beware ... you again get an incredible number of harmonics ;)

CU, Ricsi

--- GoldED+/LNX
* Origin: If you can't make it good, make it expensive (432:1/105)

Richard Menedetter wrote to Tony Langdon <=-

Hi Tony!

16 Jul 2016 17:56, from Tony Langdon -> Richard Menedetter:

Now somebody had even more sparetime on their hands:
https://github.com/F5OEO/rpitx
rpitx is a radio transmitter for

Now this is _really_ neat! :)

But beware ... you again get an incredible number of harmonics ;)

Well, you'd expect that without good filtering, like any other transmitter. :)


... If it CAN go wrong, it already did.
--- MultiMail/Win32 v0.49
* Origin: Freeway BBS - freeway.apana.org.au (432:1/101)

Hi Tony!

26 Jul 2016 08:45, from Tony Langdon -> Richard Menedetter:

Now somebody had even more sparetime on their hands:
https://github.com/F5OEO/rpitx
rpitx is a radio transmitter for

Now this is _really_ neat! :)

But beware ... you again get an incredible number of harmonics ;)

Well, you'd expect that without good filtering, like any other transmitter. :)

It creates actually more harmonics than a normal transmitter.
The problem is the PWM that is used to create the signal.
It creates square waves, with huge amounts of harmonics.
(GPIO pins are not made to transmit ham data ;)))

CU, Ricsi

--- GoldED+/LNX
* Origin: And God said, "I'll buy a vowel" (432:1/105)

Richard Menedetter wrote to Tony Langdon <=-

It creates actually more harmonics than a normal transmitter.
The problem is the PWM that is used to create the signal.
It creates square waves, with huge amounts of harmonics.
(GPIO pins are not made to transmit ham data ;)))

True, but again there are PWM transmitters that are clean (with the right filtering). :)


... Death: To stop sinning suddenly.
--- MultiMail/Win32 v0.49
* Origin: Freeway BBS - freeway.apana.org.au (432:1/101)