> Date: Wed, 1 May 2013 09:25:52 +0000 (UTC) > From: Stuart Henderson <s...@spacehopper.org> > To: misc@openbsd.org > Subject: Re: rtl_sdr (was: Re: CVS: cvs.openbsd.org: ports) > Message-ID: <slrnko1nt5.9sa....@naiad.spacehopper.org> > > On 2013-04-29, noah pugsley <noah.pugs...@gmail.com> wrote: >> So glad to see this. Receiving broadcast FM isn't even the half of it. >> >> From rtlsdr.org: >> >> >> - FM: both narrow band and wideband. The former is used on two way >> radio >> systems such as emergency services and private radio networks (like >> couriers and taxis) and UHF CB and the latter is the usual broadcast FM >> the >> likes of which you have in the kitchen and car. Aircraft and boats and >> ships also use narrow band FM which you can use RTLSDR to listen to. >> The >> SDR# software can receive both narrowband and wideband FM and the >> latter do >> stereo FM too! >> - AM: Most AM transmissions are below the bottom frequency of RTLSDR >> dongles. You will need a translator (I'll deal with translators soon) >> to >> get these frequency bands. >> - Upper/Lower Sideband (USB/LSB). See AM above. >> - CW: Continuous wave for morse code enthusiasts. >> - With GNURadio you can receive and demodulate digital modes such as >> pagers (POCSAG), ADS-B (aircraft positions), AIS (ship positions), AP25 >> and >> TETRA (digital trunk radio) and many others. >> - GPS reception is currently being worked on but should be do-able. >> - Satellite reception including receiving ham transmissions from the >> International Space Station are possible to. I have seen some screen >> shots >> of someone using RTLSDR and a 2.5m dish to track the carrier signal on >> deep >> space robots such as Voyager and the Mars missions. >> - This >> post<http://cgit.osmocom.org/cgit/rtl-sdr/commit/src?h=steve-m/direct_sampling>alludes >> to the tuner chip being disabled and the RTL chip being used to >> receive transmissions at 30MHz and below. >> >> >> Of course getting samples is one thing, doing something with them is >> another. Anybody working on a gnuradio port? :-( >> >> > > I've made a start at a gnuradio port, as has bentley@, the result of > merging them together is in openbsd-wip, but I won't have much time > to look at it further for a bit. > > https://github.com/jasperla/openbsd-wip/tree/master/comms/gnuradio
AM is used in the aircraft band from about 108 to about 144 MHz for pilots talking to towers, for historical reasons I suppose. Also the CB band around 27 MHz is mostly AM, partly SSB. I looked at your openbsd-wip stuff. You've got gnuradio-companion in your disabled list still, but you kinda need that. qtgui also: both wxgui and qtgui One big shock to me was that lxml has to be lxml from lxml.de pyqwt is also not from ports Libusb without async may be trouble too. I've got my disabled list down to comedi, uhd, shd, fcd, which is all hardware I don't have. Everything builds, nothing works. I think I've got Jack working, but I've got like 30 failures in make test among the qa tests. All of them are seqfaults. I just checked and my last post to discuss-gnuradio around April 15 never got any answers. There was a post since about tracking down segfaults but to someone else. Haven't gotten back to it. Alan -- Credit is the root of all evil. - AB1JX
