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3

libre_dev wrote

Alright, some things for peeps who might be thinking of doing this:

First make sure you have adequate filtering before you turn your pirate station on. The second, longer PDF discusses this. While I don't care about the commercial bands the state has stolen from us, please make sure you don't pollute the amateur or emergency services bands. The amateur bands especially are an oasis of self-governed spectrum in which commercial operation is strictly forbidden.

Second, software-defined radio (SDR) has made this a lot easier. Once you have yourself a HackRF or LimeSDR, most of the fiddling can be done in GNU Radio. The signal you get out of that is already pretty clean, but you should of course use filters anyway. You can use a second SDR to check how much unintended crap you're putting out. So the chain is audio stuff -> computer -> SDR -> amplifier(s) -> filter -> antenna.

2

ziq wrote

have you broadcasted before?

3

libre_dev wrote

I am a licensed amateur radio operator, so yes. But not pirate FM. Some friends of mine have, gave them similar tips. There's also turn-key solutions for this, like veronica transmitters

2

ziq wrote

do you know anything about pirate TV broadcasting? Since the UHF frequencies are no longer being used?

3

libre_dev wrote

I know there's ham DTV broadcasts being done, which I believe uses the same DVB-T standard as terrestrial digital TV. If so then it'd just be a matter of changing carrier frequency. An SDR can do this easily. Of course an SDR can also spit out analog TV just fine. There's probably code somewhere for this on the Web. Just search "gnu radio dvb-t" or so.

You need a linear amplifier for DVB-T (class A, class B etc.) since it uses QAM. FM can use more efficient amplifiers like class E or class F. Analog TV uses VSB, but you can get away with AM if you don't care about interfering with the channel below or if you have adequate filters after it.