# A small error in benchmark\_tx file **URL:** \ **Category:** GNU Radio\ **Created:** [September 6, 2015, 11:08pm UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272 "2015-09-06T23:08:21Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Post date:** [September 6, 2015, 11:08pm UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/1 "2015-09-06T23:08:21Z")
Hi all, I have been trying to send data between 2 USRP’s from the benchmark\_tx file only to observe that I have been receiving this error. Traceback (most recent call last): File “./benchmark\_tx.py”, line 147, in main() File “./benchmark\_tx.py”, line 111, in main tb = my\_top\_block(mods[options.modulation], options) File “./benchmark\_tx.py”, line 49, in **init** options.antenna, options.verbose) File “/usr/local/share/gnuradio/examples/digital/narrowband/uhd\_interface.py”, line 135, in **init** freq, gain, antenna) File “/usr/local/share/gnuradio/examples/digital/narrowband/uhd\_interface.py”, line 62, in **init** self.\_rate, self.\_sps = self.set\_sample\_rate(bitrate, sps) File “/usr/local/share/gnuradio/examples/digital/narrowband/uhd\_interface.py”, line 70, in set\_sample\_rate asked\_samp\_rate = bitrate \* req\_sps TypeError: unsupported operand type(s) for \*: ‘float’ and ‘NoneType’ I am unable to understand what this error means? I have tried to search in the Internet about this but found nothing relevant. Please advice as to what I can do? Thanks, Dave ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 7, 2015, 4:07am UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/2 "2015-09-07T04:07:08Z")
Please help so that I can proceed further as I am new to GNU Radio. Thanks, Dave ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 7, 2015, 9:26pm UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/3 "2015-09-07T21:26:57Z")
Can anyone please give an answer for the above error? Thanks, Dave ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 7, 2015, 10:16pm UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/4 "2015-09-07T22:16:39Z")
Hi Dave, it’s monday, and most of us haven’t gotten around answering emails from the weekend, so please accept my apologies for not having exploding enthusiasm when I saw your first reminder five hours after you posted your question 😉 So, first of all: thanks for the bug report! It’s always good to eradicate errors. Which version of GNU Radio are you using (run “gnuradio-config-info –version”)? I think it must be at least from 2013 or older, if these line numbers are correct, but I could be mistaken. If your GNU Radio is in fact as old as that, could you try with a newer version, and see whether that works? To try locally, we’d need the actual command line that you’re executing. Best regards, Marcus PS: One thing: I’m grumpy sometimes, sorry. Also, please sign up with an email address under [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) ; ruby-forum has lead to numerous problems on this mailing list, because it is an extraordinarily **bad** mailing list interface, shamelessly using the mails that we send here. ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 7, 2015, 10:24pm UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/5 "2015-09-07T22:24:50Z")
Hi Dave, Firstly, please sign up and post to the GNU Radio mailing list via the official method, not the Ruby forum. GNU Radio has nothing to do with Ruby! Official GNU Radio mailing list sign-up link: [https://lists.gnu.org/mailman/listinfo/discuss-gnuradio](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) In regard to your question, make sure you specify all parameters on the command line, especially frequency, lo-offset and antenna to see whether that fixes it for you. I believe the ‘none-type’ error pops up because some parameter hasn’t been specified and the empty parameter isn’t error checked/initialised to ‘0’ correctly if not specified on the command line. This may be related to the following bug: [https://gnuradio.org/redmine/issues/705](https://gnuradio.org/redmine/issues/705) Mike – Mike J. M0MIK BSc MIET Email: removed\_email\_address@domain.invalid Web: [http://scanoo.com](http://scanoo.com) ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 7, 2015, 11:55pm UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/6 "2015-09-07T23:55:23Z")
Ha, ok, so I was mistaken regarding the version 3.7.7 is relatively recent! Sanity check: the benchmark\_tx and all other files in that directory came with your version GNU Radio, and you did not download them elsewhere, right? Have you tried “./benchmark\_tx --help”, and then specifying things like samples per symbol and sampling rate manually? Best regards, Marcus ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 7, 2015, 11:51pm UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/7 "2015-09-07T23:51:10Z")
Thanks for the reply. I really appreciate it. I have subscribed to the mailing list. And in regard to my question, I have given the command and it has popped up this line gnuradio-config-info --version v3.7.7.1-198-g9e133ccb I am not sure of what version the GNU Radio it can be? The command I have given was " ./benchmark\_tx.py -f 2.435G " and it pops up the above error. But if I do the same thing for ./benchmark\_rx.py -f 2.435G, it shows no error and waits for transmitter to transmit the packets. And also can I please attach my benchmark files so that you might be able to view those. Thanks, Dave ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 8, 2015, 12:05am UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/8 "2015-09-08T00:05:43Z")
Yes, I tried that. Regarding the former question, I guess I have kept all the files in that manner but I downloaded recent files of benchmark\_tx.py and uhd\_interface.py files as far as I remember. Regarding the latter, I was not able to give manually because I did not know as to exactly what sampling rate and how many samples per symbol I can insert. Please help with this. I have posted this in mailing list too. Thanks, Dave ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 8, 2015, 12:08am UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/9 "2015-09-08T00:08:15Z")
Dave, this might look strange to the afterworld, but: Are you Ravi? Best regards, Marcus ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 8, 2015, 12:13am UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/10 "2015-09-08T00:13:30Z")
I am sorry. No ---
**Author:** ![daveamos](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/a698b9/32.png) [@daveamos](https://www.ruby-forum.com/u/daveamos)\ **Post date:** [September 8, 2015, 12:32am UTC](https://www.ruby-forum.com/t/a-small-error-in-benchmark-tx-file/243272/11 "2015-09-08T00:32:12Z")
Hi Dave, Don’t be sorry 🙂 However, of you’ve modified the scripts yourself, there’s no way for anyone but you to find out what goes wrong. Can you save your modifications somewhere else, and overwrite all potentially modified scripts with their original version? Ravi has a very similar case, and I recommended not installing over everything if Ravi knew where the originals are. If you don’t know, reinstalling might be the easiest way to get the originals. Best regards, Marcus PS: I’ll stop answering emails from Ruby forum now, and wait till you send them from your regular email account Am 8. September 2015 00:13:30 MESZ, schrieb Dave Allen [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):