Re: [Discuss-gnuradio] Streaming Funcube Dongle Pro+ over UDP
Hi again,
I was a little surprised that your connection couldn't handle the 12.3 Mbit/s
for the complex 192ksam/s,
so I had a look at the source code of the fcd_source; that basically wraps an
audio source.
Surprise was mine when I found out that there's no complex 192ksam/s at all...
The audio device is set to
deliver 96ksam/s of stereo, that gets converted to 96ksam/s of complex samples.
Therefore, the data rate is only 6.144Mbit/s for your wifi link... Not very
much.
Anyway, what (due to that being the default data type in GR), the audio source
inside the fcd_source converts
the 16bit adc resolution of your dongle to 32bit floats; so, instead of
streaming those using GR over your network,
you can also just stream raw audio data from your beaglebone to your receiver
computer, something like
arecord --format={try something like S16_LE, U16_LE, see man arecord} -D
beagleboardaudiodev --file-type=raw --channels=2 --disable-resample
--disable-channels --disable-format |ncat host port
and
ncat -l port > rxfifo
on the receiver.
And then reading that file using a file source, converting the 16bit
signed/unsigned ints to floats, packing them into complexes and using that for
your receiver; note, however, that a lost packet is not tolerable in this case,
you will end up with corrupt samples if lost bytes are not multiples of 4...
To the TCP/UDP sources in GR: they do what they were designed for, dropping
samples from an outside source makes sense if your flowgraph can't handle the
load, since there is no such thing as the infinite buffer or the infinite
acceptance of latency; not so much for your fifos. They start blocking when you
ram+swap is used up...
Greetings
Marcus
On 08/10/2013 03:15 AM, Vanush Vaswani wrote:
Iain, thanks for that. Will be helpful in my gnuradio pursuits.
I think the TCP blocks should be definitely be decoupled from GRC...
With regards to my problem, I tried the ncat/fifo approach, and it works
acceptably. Using TCP, I get a few overflows on the sender (beaglebone) as
expected due to the nature of TCP. With UDP, I can stream with very few skips
(and this is all over WiFi too). Thus, for my app, I may use a fifo + Twisted
to get data out of gnuradio. I think the TCP/UDP blocks are a bit spartan in
gnuradio.
For the record, here are my commands
sender: ncat -u 192.168.0.8 31337 < txfifo (txfifo is a File sink
directly connected to a FCDPP source)
receiver: ncat -k -u -l 192.168.0.8 > rxfifo (rxfifo is a File source connected
to a WBFM Receiver and then Audio sink)
On Sat, Aug 10, 2013 at 8:15 AM, Marcus D. Leech mailto:mle...@ripnet.com>> wrote:
On 08/09/2013 05:29 PM, Marcus Müller wrote:
You're right, although grc_blks2 is in grc/grc_gnuradio, which, as far as I
would guess from here,
won't be built if you don't build GRC, which you usually don't when in a
headless environment.
There's also no necessity to do the development side on the target
platform, if you're just targetting a headless environment. Take the generated
Python, and run it on the target.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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Re: [Discuss-gnuradio] Public transport in Boston
Actually, the "T" (the subway) *does* go to the airport, to Boston Logan Airport. The Blue Line stops there. And then there are free shuttle busses to take you to all the terminals. You can take the Blue Line into the city and transfer, for free, to the Red, Orange, and Green Lines. > > From: "Nowlan, Sean" >To: Nick Foster ; Philip Balister >Cc: GNURadio Discussion List >Sent: Monday, August 5, 2013 11:50 AM >Subject: Re: [Discuss-gnuradio] Public transport in Boston > > > > >Also, the train doesn’t go to the airport, but there are frequent bus >transfers to nearby train stations. I suggest Google Maps or the MBTA website >itself. The latter provides a Route Planning tool an lets you choose between >Google Maps or their own interface. > >http://www.mbta.com/ > >--sean > >From:discuss-gnuradio-bounces+sean.nowlan=gtri.gatech@gnu.org >[mailto:discuss-gnuradio-bounces+sean.nowlan=gtri.gatech@gnu.org] On >Behalf Of Nick Foster >Sent: Monday, August 05, 2013 11:40 AM >To: Philip Balister >Cc: GNURadio Discussion List >Subject: Re: [Discuss-gnuradio] Public transport in Boston > >Boston's "T" is a pretty good, reasonably reliable public transit system, and >the city is compact enough that it's generally pretty easy to get around. The >conference is very close to South Station, which is the largest transport hub >in Boston. South Station is on the Red Line of the MBTA subway and is easy to >get to from any other "T" stop with a maximum of 1 transfer. > >If you were incredibly, world-class cheap, you could even stay way out in the >suburbs and take the commuter rail into South Station for the conference. >Personally, if I wanted to save money, I'd look out toward Quincy Adams on the >south end of the Red Line for a cheaper place to stay, and take the Red Line >into South Station. > >Here's a map showing the subway and commuter rail lines: >http://www.mbta.com/schedules_and_maps/rail/ > >--n >On Mon, Aug 5, 2013 at 8:12 AM, Philip Balister wrote: >I am looking at hotels in Boston GR Con. Needless to say, I will never >complain about Si valley rates again. > >Does anyone have any comments about public transport in Boston? >Especially about getting from cheaper hotels to the conference location. > >Thanks, > >Philip > >___ >Discuss-gnuradio mailing list >Discuss-gnuradio@gnu.org >https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >___ >Discuss-gnuradio mailing list >Discuss-gnuradio@gnu.org >https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > >___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Public transport in Boston
You can also try AirBnB (https://www.airbnb.com/).
There a lot of people in Boston doing short-term
sublets of their very nice apartments.
Look in these areas:
Boston: South Boston ("Southie"), Back Bay, The Fenway (on the Green Line)
Cambridge: Kendall Sqaure, Central Square, Harvard Square, Porter Square, Fresh
Pond (all are on the Red Line)
Somerville: Davis Square (on the Red Line)
>
> From: Ben Reynwar
>To: Philip Balister
>Cc: GNURadio Discussion List
>Sent: Monday, August 5, 2013 12:01 PM
>Subject: Re: [Discuss-gnuradio] Public transport in Boston
>
>
>There are also a few backpacking hostels in downtown boston, some of
>which probably have private rooms. Not quite the same as a hotel, but
>normally way cheaper.
>
>On Mon, Aug 5, 2013 at 8:12 AM, Philip Balister wrote:
>> I am looking at hotels in Boston GR Con. Needless to say, I will never
>> complain about Si valley rates again.
>>
>> Does anyone have any comments about public transport in Boston?
>> Especially about getting from cheaper hotels to the conference location.
>>
>> Thanks,
>>
>> Philip
>>
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Re: [Discuss-gnuradio] Public transport in Boston
On Aug 10, 2013, at 10:11 AM, Bruce Penswick wrote: > Actually, the "T" (the subway) *does* go to the airport, to Boston Logan > Airport. The Blue Line stops there. And then there are free shuttle busses to > take you to all the terminals. You can take the Blue Line into the city and > transfer, for free, to the Red, Orange, and Green Lines. And, I'll echo, that this works vice-versa too. You can take a free MBTA bus from any Logan Airport Terminal to the MBTA Airport Blue Line stop, then the MBTA Blue Line back into Boston, and switch to other MBTA Lines as needed from there. I believe it is still the case that you pay at the MBTA Airport stop, once, and then can transfer internal to the train MBTA as needed (except maybe parts of the MBTA Green Line [the parts which are above ground]). To the best of my memory, there is no MBTA stop on the side of the channel where GRCon 2013 is located. The easiest, as mentioned before, is South Station (on the Red Line), which is at the corner of Atlantic and Summer. Arriving at this Station, you would exit the Station and walk (roughly south-east) across the Summer St Bridge to 281 Summer. Or, I'm sure there is a MBTA Bus one can take in inclement weather (for an extra fee, probably, or maybe a transfer; I never really figured out how to do transfers when I lived in Boston); or a taxi, though that's kinda silly for such a short distance. - MLD ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Public transport in Boston
actually now there is a new Silver Line, which takes you from South Station, past where GRcon is being held, to Logan Airport. https://en.wikipedia.org/wiki/Silver_Line_%28MBTA%29 http://www.mbta.com/schedules_and_maps/subway/lines/?route=SILVER http://www.mbta.com/schedules_and_maps/subway/lines/?route=BLUE > > From: Michael Dickens >To: GNURadio Discussion List >Sent: Saturday, August 10, 2013 10:25 AM >Subject: Re: [Discuss-gnuradio] Public transport in Boston > > >On Aug 10, 2013, at 10:11 AM, Bruce Penswick wrote: >> Actually, the "T" (the subway) *does* go to the airport, to Boston Logan >> Airport. The Blue Line stops there. And then there are free shuttle busses >> to take you to all the terminals. You can take the Blue Line into the city >> and transfer, for free, to the Red, Orange, and Green Lines. > > >And, I'll echo, that this works vice-versa too. You can take a free MBTA bus >from any Logan Airport Terminal to the MBTA Airport Blue Line stop, then the >MBTA Blue Line back into Boston, and switch to other MBTA Lines as needed from >there. I believe it is still the case that you pay at the MBTA Airport stop, >once, and then can transfer internal to the train MBTA as needed (except maybe >parts of the MBTA Green Line [the parts which are above ground]). > >To the best of my memory, there is no MBTA stop on the side of the channel >where GRCon 2013 is located. The easiest, as mentioned before, is South >Station (on the Red Line), which is at the corner of Atlantic and Summer. >Arriving at this Station, you would exit the Station and walk (roughly >south-east) across the Summer St Bridge to 281 Summer. Or, I'm sure there is >a MBTA Bus one can take in inclement weather (for an extra fee, probably, or >maybe a transfer; I never really figured out how to do transfers when I lived >in Boston); or a taxi, though that's kinda silly for such a short distance. - >MLD > > >___ >Discuss-gnuradio mailing list >Discuss-gnuradio@gnu.org >https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > >___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Public transport in Boston
Cool; I've been out of Boston for ~8 years now, so the Silver Line is new to me. Thanks! It looks from the map < http://www.mbta.com/uploadedFiles/Documents/Schedules_and_Maps/Bus/silverwatermap.pdf > that the Silver Line's SL1 and SL2 go by the World Trade Center, with a stop at the Courthouse which is on Seaport Boulevard; so not on Summer St where the GRCon building is, but close by. One could get off at Courthouse and walk South on (looks like) Thompson Place to get to the GRCon building. It would probably be faster to just get off at South Station and walk across the Summer St Bridge though. It also looks like MBTA Buses 4 and 7 go right by the GRCon meeting place; Bus 11 goes very close. So, lots of public transport options. Getting out of the Airport is also easier because the Silver Line goes directly to terminals (or, that's the way it looks from the maps @ < http://www.mbta.com/schedules_and_maps/subway/ >; can anyone confirm?). - MLD On Aug 10, 2013, at 10:32 AM, Bruce Penswick wrote: > actually now there is a new Silver Line, which takes you from South Station, > past where GRcon is being held, to Logan Airport. > > https://en.wikipedia.org/wiki/Silver_Line_%28MBTA%29 > > http://www.mbta.com/schedules_and_maps/subway/lines/?route=SILVER > > http://www.mbta.com/schedules_and_maps/subway/lines/?route=BLUE ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Public transport in Boston
Sorry for the bad info; I wasn't aware of the Blue Line T going to the airport. In the past I've taken the Silver Line (bus rapid transit) to South Station and transferred to the Red Line. --sean From: discuss-gnuradio-bounces+sean.nowlan=gtri.gatech@gnu.org [discuss-gnuradio-bounces+sean.nowlan=gtri.gatech@gnu.org] on behalf of Michael Dickens [m...@alum.mit.edu] Sent: Saturday, August 10, 2013 12:07 PM To: Bruce Penswick Cc: GNURadio Discussion List Subject: Re: [Discuss-gnuradio] Public transport in Boston Cool; I've been out of Boston for ~8 years now, so the Silver Line is new to me. Thanks! It looks from the map < http://www.mbta.com/uploadedFiles/Documents/Schedules_and_Maps/Bus/silverwatermap.pdf > that the Silver Line's SL1 and SL2 go by the World Trade Center, with a stop at the Courthouse which is on Seaport Boulevard; so not on Summer St where the GRCon building is, but close by. One could get off at Courthouse and walk South on (looks like) Thompson Place to get to the GRCon building. It would probably be faster to just get off at South Station and walk across the Summer St Bridge though. It also looks like MBTA Buses 4 and 7 go right by the GRCon meeting place; Bus 11 goes very close. So, lots of public transport options. Getting out of the Airport is also easier because the Silver Line goes directly to terminals (or, that's the way it looks from the maps @ < http://www.mbta.com/schedules_and_maps/subway/ >; can anyone confirm?). - MLD On Aug 10, 2013, at 10:32 AM, Bruce Penswick wrote: > actually now there is a new Silver Line, which takes you from South Station, > past where GRcon is being held, to Logan Airport. > > https://en.wikipedia.org/wiki/Silver_Line_%28MBTA%29 > > http://www.mbta.com/schedules_and_maps/subway/lines/?route=SILVER > > http://www.mbta.com/schedules_and_maps/subway/lines/?route=BLUE ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Zeroing out packets at RX2 if transmitted by own RFX900's TX/RX
Hi My goal is that when the USRP N200 R4 is transmitting packets, the receive antenna on it's own daughterboard should not receive the transmitted packets. For this, I am trying to zero out the samples of packets(GMSK) received by the RX2 antenna (on RFX900 daughterboard ) precisely for the duration of time when the TX/RX antenna is transmitting packets, by modifying the FPGA image. There are certain subtle points I need to take care of: 1) My understanding is that 'tx_run' will give a '1' for the time duration between 'sob' and 'eob' as encountered by the FPGA. Am I right or wrong ? 2) If I try to zero out the incoming received samples at RX2 during this duration(when tx_run=1), it will not solve the purpose because the time by when the packet/signal is actually transmitted in air by the TX/RX antenna, by that time the zeroing out at RX2 would have stopped (as tx_run is no longer '1'). Am I right or wrong ? What would be the best way to do this? Any suggestions would be appreciated. Amy ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Help: Display Freezes
I notice for some reason the scope display goes dim and seems to continue to display signals but you can not change any sliders or change scope tabs and if you try to stop it from the scope display(pressing the X in the upper left corner) it says " The window, "My Scope" is not responding. Forcing this application to quit will cause you to lose any unsaved changes." I have a throttle in the flow graph. This behavior seems to happen after adding a block to the flow graph, it doesn't just suddenly appear. Thanks...Tom___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
