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F5OEO / rpitx

RF transmitter for Raspberry Pi
GNU General Public License v3.0
4.06k stars 539 forks source link

Amplitude modulation #328

Closed Michael-AUG closed 6 months ago

Michael-AUG commented 6 months ago

Hi there

Firstly, what cool software!

Given you are able to produce both FM and SSB, is there any way that you'd be able to generate amplitude modulation with this software? When BBC R4 on longwave (198kHz) turns off, I am hoping I can use this, via some attenuation, to directly drive an old AM radio receiver.

Many thanks. 73 Michael GM5AUG

KubaPro010 commented 6 months ago

From what i can see, you in theory can generate AM, however the RPi cant control the output amplitude very well, and as AM has a lot with amplitude, that causes problems, SSB in theory should be the same but it somehow works (idk how, i haven't listened to rpi ssb, only fm)

Michael-AUG commented 6 months ago

Interesting - thanks. I wonder whether @F5OEO would consider this as a future feature request?

KubaPro010 commented 6 months ago

No, you can't control the amplitude unless you do a hardware mod or the raspberry pi would get a better power output selection (right now, rpi 5 is not even supported in rpitx)

Michael-AUG commented 6 months ago

OK. Thanks anyway - was worth asking :)