IRC log of #harmattan for Tuesday, 2013-08-20

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robertjwRzR: did anyone back up the forum.meego.com content before it was taken down?14:18
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RzRnot me14:32
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DocScrutinizer05dm8tbr: according to guys at #rtlsdr and according to the tools' parameters you can go down with sample freq to 900ks/s, equiv to 2*8bit per sample * 900k samples per second. Some particular frequencies <900k also are supported15:27
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dm8tbrthat might fit15:28
DocScrutinizer05indeed :-D15:28
DocScrutinizer05I'm still lost in install hell (on my PC!), with stuff like https://github.com/dbasden/python-librtlsdr needed by https://raw.github.com/keenerd/rtlsdr-waterfall/master/waterfall.py15:30
SpeedEvilI've had fldigi running on my n900 - on the debian chroot thing15:34
SpeedEvilWhich is sort of SDR15:34
SpeedEvilThoguh only from audio in15:34
SpeedEvildl-fldigi -is a shiny fork that uploads received strings to a server. We use it over in #highaltitude to receive signals from high altitude balloons - 500km+@433MHz/10mW is quite common15:35
DocScrutinizer05wow, sounds nice15:40
DocScrutinizer05maybe you could replace it by a rtl-stick soon ;-)15:40
DocScrutinizer05power consumption is ~150mA..200mA according to unconfirmed "I heard"-reports15:41
DocScrutinizer05##rtlsdr seems a nice channel for guys with interest in amateur-radio etc15:42
SpeedEvilAnd yes - the issue is that you need to add a SAW filter for sane use15:43
SpeedEvilAs otherwise local reception kills it15:43
SpeedEvillocal interference - and the sticks are generally quite deaf15:43
DocScrutinizer05yep15:44
SpeedEvilhttp://www.funcubedongle.com/ - is the step up15:44
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DocScrutinizer05hmm, for 124GBP you can expect some better quality than for a 20EUR thingie. Sure15:47
DocScrutinizer05anyway I'm tempted to get one, if only for the lower band (150kHz+) that's not covered by any of the RTL sticks15:48
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DocScrutinizer05why do I feel a certain disappointment about upper freq 2.05GHz and not 2.2GHz?15:50
SpeedEvil:)15:53
robertjwDoc:  have you checked out the hackrf project (upper bandwidth of 6GHz)15:58
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DocScrutinizer05robertjw: nope. link?16:25
robertjwhttp://greatscottgadgets.com/hackrf/16:26
DocScrutinizer05SpeedEvil: >> Poor engineering caused the Funcube Dongle Pro to have worse dynamic range and sensitivity than the 10 GBP RTL E4000 DVB-T dongles available on ebay.<< http://www.funcubedongle.com/?page_id=1201#comment-671316:27
robertjwIt's a kickstarter project with delivery Jan 201416:27
DocScrutinizer05robertjw: thanks :-)16:27
SpeedEvilIIRC the pro is a lot better16:27
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DocScrutinizer05anyway, the funcubedongle has no sufficient bandwidth/samplingrate on the AD/IF to allow any of the more interesting usecases17:06
DocScrutinizer05it's a receiver strictly designed as narrowband AIUI17:06
DocScrutinizer05doesn't even support USB2.017:07
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DocScrutinizer05it's feeling like in the electronics shop you wonder "shall I get the DMM that has 8 digits but only up to 20V and only DC. Or shall I get the DMM that has a built in scope function. Or the one that also tests L and C and arbitrary 4-poles"17:10
SpeedEvilyeah17:17
SpeedEvilWideband recievers do have their own issues.17:17
SpeedEvilPretty soon you run into the USB limits - and end up neeeing a big FPGA on the card17:17
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DocScrutinizer05yeah21:41
DocScrutinizer05an integrated SDR chip directly coupled to the RAM of DSP, that would be a nice hw feature on an embedded device21:42
DocScrutinizer05funny enough that my original GTA04 product design suggestion had sth like that on the preliminary specs21:44
DocScrutinizer05as an alternative to implementing FM-radio, 433/868MHz, and maybe even BT and WLAN21:46
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DocScrutinizer05of course it would have other problems, like concurrency of use, and power requirements21:47
DocScrutinizer05but hey, gta04 been an experimental design21:48
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