# Spectrum record **URL:** \ **Category:** GNU Radio\ **Created:** [July 27, 2014, 12:09pm UTC](https://www.ruby-forum.com/t/spectrum-record/231202 "2014-07-27T12:09:35Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [July 27, 2014, 12:09pm UTC](https://www.ruby-forum.com/t/spectrum-record/231202/1 "2014-07-27T12:09:35Z")
Hi list, I want to record a 5MHz wide bandwidth with usrp1 (equipped with dbsrx1 and modified clock @ 52MHz), can anyone guide me how to do this, I am using usrp\_rx\_cfile (using gnuradio-3.4.2 for special purpose) with gain =52 decimation= 26 Please do let me know if I need to make any changes in any file to accomplish my task. Thanks in advance ---
**Author:** ![gsmandvoip](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/e19adc/32.png) [@gsmandvoip](https://www.ruby-forum.com/u/gsmandvoip)\ **Post date:** [July 27, 2014, 1:34pm UTC](https://www.ruby-forum.com/t/spectrum-record/231202/2 "2014-07-27T13:34:58Z")
Hi gsmandvoip, Your decimation seems about right (oh, I don’t miss libusrp). I don’t think you need to change the example, but please be aware that libusrp has become so obsolete that I don’t even have the source code around anymore. I’m not totally sure you need to use libusrp to have openBTS (which is what I guess you mean by special purpose): [http://wush.net/trac/rangepublic/wiki/BuildInstallRun](http://wush.net/trac/rangepublic/wiki/BuildInstallRun) I haven’t tried, but I’m fairly certain that UHD still supports the B100/USRP1 (and that GNU Radio thus did not drop support for that on 3.5.0), and thus I don’t really know why the combination OpenBTS and USRP1 calls for GR3.4.2; is there someone who could enlighten me? I’m fairly certain I’ve been sending text messages over openBTS that was operating a B210, so UHD&openBTS _should_ work… Greetings, Marcus