On Mon, Nov 09, 2020 at 03:32:19PM -0500, Karl wrote: > On Mon, Nov 9, 2020 at 2:20 PM \0xDynamite <[email protected]> wrote: > > > > > > > > > how can computer programers fix a political problem? > > > > > > > > > > > > By making an underground network. Ad hoc, mesh networks.... > > > > > > if you wanted to get really sneaky, i suppose you could record > > > emissions from some other device, play them back at a high sample > > > rate, and encode your information in 'normal' variations in their > > > behavior. > > > > How do you even "record" a radio transmission? I mean, without > > converting into the visible spectrum first, which by the way just > > shows that the visible spectrum just can't be the same as the EM > > spectrum. It must be orthogonal to it. > > You can make an iq log with gnuradio or pothos. The featureset for it > might be a little buggy, but it should be easy to shore up. You > basically get a stereo audio file at an unimaginably high sample rate.
No. Try this: s/unimaginably high/sufficient/ We need to think like engineers, not defeated conspiracists… > Then we get to separate the signal out from the other things in the > recording, so as to reproduce it. > > The bandwidth (range of high and low frequencies) of radio signals is > far beyond that of any normal receiver, too, so you may need multiple > receivers or to record the signal many times, (or ideally to learn > radio engineering and join up with folks making open source sdrs). > > The latest post to rtl-sdr.com is about recording airplane radio > transmissions to identify the craft based on its transmission hardware > quirks, which is a beautiful thing to see: > https://www.rtl-sdr.com/rf-fingerprinting-ads-b-signals-for-security/ > > > > > Cool idea though. > > > > \0xd
