# Infinite receive and transmission **URL:** \ **Category:** GNU Radio\ **Created:** [June 18, 2015, 3:16pm UTC](https://www.ruby-forum.com/t/infinite-receive-and-transmission/242356 "2015-06-18T15:16:21Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Post date:** [June 18, 2015, 3:16pm UTC](https://www.ruby-forum.com/t/infinite-receive-and-transmission/242356/1 "2015-06-18T15:16:21Z")
Hello list, I am beginner for USRP networked series N210. I have two N210 connected to my host i.e. laptop. I am trying to check transmission and reception using two USRP . When i am passing the command for transmission it is taking too much time (running sicne last 3 hours) . I am using benchmark\_tx.py and benchmark\_rx.py by passing the below command for the transmission; gnuradio/gr-digital/examples/narrowband$ sudo python benchmark\_tx.py --args=addr=192.168.10.4 -f 800e6 -r 500e3 -A TX/RX -M 0.5 --tx-gain 10 --ampl 0.5 Why this almost infinite time. However, this issue was not with the USRP 1 series with the same commands. what i am doing wrong while transmission? Please guide me in this regards. Thank you, regards ---
**Author:** ![alok\_ranjan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/94ad74/32.png) [@alok\_ranjan](https://www.ruby-forum.com/u/alok_ranjan)\ **Post date:** [June 18, 2015, 3:57pm UTC](https://www.ruby-forum.com/t/infinite-receive-and-transmission/242356/2 "2015-06-18T15:57:50Z")
On Thu, Jun 18, 2015 at 9:14 AM, alok ranjan [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > benchmark\_rx.py by passing the below command for the transmission; > Please guide me in this regards. > > Thank you, regards I’m not sure what you mean by it being “almost infinite time”? You mean it’s taking too long to start transmitting? Thing 1: don’t run this command with sudo. There’s no need for that. If you are having issues with permission talking to the hardware, fix those by installing the udev rules. Thing 2: the benchmark\_tx.py script only transmits a finite number of packets. Here you are setting it to 0.5 MB and your transmitting at 0.5 Mb/s, so you should be done in about 8 seconds. Also, what version of GNU Radio are you running? The ‘–ampl’ isn’t a supported argument for this. It’s ‘–tx-amplitude’. Run ‘gnuradio-config-info -v’ to find this out. Tom ---
**Author:** ![alok\_ranjan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/94ad74/32.png) [@alok\_ranjan](https://www.ruby-forum.com/u/alok_ranjan)\ **Post date:** [June 18, 2015, 4:25pm UTC](https://www.ruby-forum.com/t/infinite-receive-and-transmission/242356/3 "2015-06-18T16:25:54Z")
Hello Tom, Thank you for your reply to my queries . After running the command for ’ gnuradio-config-info’ it is giving the output as 3.7.2.1 . Infinite time means that it keep on transmitting for several hours (Checked upto 5 hours). Thank you, From: removed\_email\_address@domain.invalid Date: Thu, 18 Jun 2015 09:56:07 -0400 Subject: Re: [Discuss-gnuradio] infinite receive and transmission To: removed\_email\_address@domain.invalid CC: removed\_email\_address@domain.invalid On Thu, Jun 18, 2015 at 9:14 AM, alok ranjan [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: Hello list, I am beginner for USRP networked series N210. I have two N210 connected to my host i.e. laptop. I am trying to check transmission and reception using two USRP . When i am passing the command for transmission it is taking too much time (running sicne last 3 hours) . I am using benchmark\_tx.py and benchmark\_rx.py by passing the below command for the transmission; gnuradio/gr-digital/examples/narrowband$ sudo python benchmark\_tx.py --args=addr=192.168.10.4 -f 800e6 -r 500e3 -A TX/RX -M 0.5 --tx-gain 10 --ampl 0.5 Why this almost infinite time. However, this issue was not with the USRP 1 series with the same commands. what i am doing wrong while transmission? Please guide me in this regards. Thank you, regards I’m not sure what you mean by it being “almost infinite time”? You mean it’s taking too long to start transmitting? Thing 1: don’t run this command with sudo. There’s no need for that. If you are having issues with permission talking to the hardware, fix those by installing the udev rules. Thing 2: the benchmark\_tx.py script only transmits a finite number of packets. Here you are setting it to 0.5 MB and your transmitting at 0.5 Mb/s, so you should be done in about 8 seconds. Also, what version of GNU Radio are you running? The ‘–ampl’ isn’t a supported argument for this. It’s ‘–tx-amplitude’. Run ‘gnuradio-config-info -v’ to find this out. Tom ---
**Author:** ![alok\_ranjan](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/94ad74/32.png) [@alok\_ranjan](https://www.ruby-forum.com/u/alok_ranjan)\ **Post date:** [June 18, 2015, 4:38pm UTC](https://www.ruby-forum.com/t/infinite-receive-and-transmission/242356/4 "2015-06-18T16:38:46Z")
On Thu, Jun 18, 2015 at 10:04 AM, alok ranjan [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Thank you, No, it can’t possibly be transmitting for that length of time. Are you verifying that it’s actually transmitting? Or is it just that the script never stops? What does it look like on your receiver? Tom