tr_usrp.grc not transmitting via usrp

[nilampradhan2]

i tried to transmit LoRa signal by running tr_usrp using USRP B200, but nothing is transmitted. red light LED is OFF only.

[matt-knight]

Hi @nilampradhan2, two thoughts:

1. The flowgraph expects to be fed packets via the GNU Radio asynchronous message API. The easiest way to do this is to use a UDP socket, as I have instrumented in the examples. Run the flowgraph, connect to it via $ nc, type in some text, hit enter, and see what happens.

2. If this doesn't work, check your logs to ensure UHD isn't complaining.

Hope this helps,
Matt

[nilampradhan2]

Thank you Matt for quick response. Now it is working with Random socket PDU, but when i select socket PDU source and doing same procedure as you have mentioned, it unable to transmit. Red LED is OFF only. I will try it again. Regards, Nilam Pradhan Asst. Prof. E & TC Dept. MITCOE, Pune

…

On Fri, Feb 23, 2018 at 4:46 AM, matt-knight ***@***.***> wrote: Hi @nilampradhan2 <https://github.com/nilampradhan2>, two thoughts: 1. The flowgraph expects to be fed packets via the GNU Radio asynchronous message API. The easiest way to do this is to use a UDP socket, as I have instrumented in the examples. Run the flowgraph, connect to it via $ nc, type in some text, hit enter, and see what happens. 2. If this doesn't work, check your logs to ensure UHD isn't complaining. Hope this helps, Matt — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#27 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AilqVDiMdVI5Am65Z073gvdk0hEGxtCiks5tXfU3gaJpZM4SJTR3> .

[matt-knight]

Sounds like it's a network configuration issue. Try UDP mode, and nc over localhost and the appropriate port.

[nilampradhan2]

Thanks for reply. My transmitter is working with udp socket PDU. RED LED turns ON for few seconds. After sending over it shows letter U in log and receiver socket pdu don't receive anything. I give nc command and port address.

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On 1 Mar 2018 12:12 am, "matt-knight" ***@***.***> wrote: Sounds like it's a network configuration issue. Try UDP mode, and nc over localhost and the appropriate port. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#27 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AilqVE16vRBj3gXY-3wD-Dx-TVwJva3fks5tZZ4igaJpZM4SJTR3> .

[brunoricardojava]

@nilampradhan2 could you tell which modifications made it work?
I'm using a USRP N210 and not working.

[nilampradhan2]

I set parameters as frequency 868Mhz, code rate 4, sampling rate 250 khz, bw 250 khz , sf 8. Header false, transmit gain 50

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On Wed, 28 Mar 2018, 11:29 pm Bruno Ricardo Scherer, < ***@***.***> wrote: @nilampradhan2 <https://github.com/nilampradhan2> could you tell which modifications made it work? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#27 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AilqVAlnN0IpazPRaG-3-037OFtQWiGnks5ti8-EgaJpZM4SJTR3> .

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[hningning]

Hi,@nilampradhan2 Have you solved this problem?I opened two terminals and connected to the flowgraph via
$ nc -l -u localhost 52002 and $ nc -u localhost 52001. After sending over it shows letter U in log just the same as you mentioned before.

[nishant1110]

Hello @matt-knight. I am trying to replicate your project using USRP B200mini and I was able to build, compile and run it transmitting and receiving using netcat and socket PDU over UDP but as everyone I see "UUUU" on the output screen. The receiver shows Green light on but there is no red light for transmitter.

What do you suggest? TIA.