Very helpful thank you
Sent from my iPhone Andrew Rich On 04/01/2011, at 5:22, "Mark J. Blair" <n...@nf6x.net> wrote: > > On Jan 2, 2011, at 1:31 PM, Andrew Rich wrote: >> I have a MacBook PRO I7 it can run OS X or windows > > I have been successfully using the Ettus Research USRP with LFRX, LFTX and > WBX boards on my 17" MacBook Pro under OS X (Snow Leopard). Installing the > software portion is pretty easy: Install the MacPorts package, then run "sudo > port install gnuradio" in a terminal window. You can play with the gnuradio > software to see if it's right for you before committing to buying any > hardware, since it can use the audio device and/or data files as a > source/sink, or even run entirely simulated flowgraphs. > > I haven't used any gnuradio-based canned ham radio USB/LSB/whatever > applications (if any exist). I have successfully received 2m FM transmissions > with one of the examples that comes with the gnuradio distribution. I've > mostly used my hardware to generate fairly simple test signals for other > radio hardware (i.e., a number of simultaneous CW tones within a fairly > narrow bandwidth) and simple spectrum analysis. At the moment, I'm playing > around with writing blocks and flowgraphs for sending and receiving > high-speed Morse code, due to my current interest in devices such as the > AN/GRA-71 code burst keyer (*). This is all pretty simple stuff that the USRP > hardware is overkill for, but I'm just beginning to learn about gnuradio and > SDR design in general. > > Based on what you've stated so far, I think that a USB-based USRP with a WBX > board and the gnuradio software should work nicely for you, and you can work > with it directly under OS X. You may also want to get an RFX2400 board to hit > the 2.4GHz band (I have one, but haven't done much with it yet). This board > combination will leave a hole between 2.2GHz and 2.3GHz. > > If I recall correctly, I've generally set my hardware decimation to limit > sampled bandwidth to about 2 MHz in order to avoid USB over-runs and/or > under-runs. I've been able to look at a 4 MHz bandwidth with occasional > over/under-runs. The occasional over/under-run doesn't seem to cause problems > when just visually watching an FFT plot (i.e., to look for activity within a > band). > > I don't know if the Ethernet-based USRP platforms work on Macs yet. > > > > > (*) More info here if you're curious: > > http://www.militaryradio.com/spyradio/gra71.html > > These are available (though rare) on the surplus market, but I'm unaware of > any of the original receiving equipment that has made it out to the hands of > collectors. A SDR setup seems like a natural way to handle receiving the code > burst and then either playing it back at low speed for manual decoding, or > automatically decoding the transmission at normal speed. > > -- > Mark J. Blair, NF6X <n...@nf6x.net> > Web page: http://www.nf6x.net/ > GnuPG public key available from my web page. > > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
