# Getting noise for FM receiver with usrp e110? **URL:** \ **Category:** GNU Radio\ **Created:** [June 12, 2014, 12:16pm UTC](https://www.ruby-forum.com/t/getting-noise-for-fm-receiver-with-usrp-e110/230348 "2014-06-12T12:16:42Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Post date:** [June 12, 2014, 12:16pm UTC](https://www.ruby-forum.com/t/getting-noise-for-fm-receiver-with-usrp-e110/230348/1 "2014-06-12T12:16:42Z")
Hi everybody, I’m trying to implement FM receiver on usrp e110. The daugtherboard used is SBX Board Rev 5.1. As a result, I got only noise, I wasn’t able to hear the local station at 103.5 Mhz. And I got this error: _UHD Warning:_ - The hardware does not support the requested RX frequency:\* - Target frequency: 103.500000 MHz\* - Actual frequency: 423.500000 MHz\* _\>\>\> gr\_fir\_ccf: using armv7\_a_ _\>\>\> gr\_fir\_fff: using armv7\_a_ _aUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUaUOaUaUaUOaUaUaUaUaUaUaUaUaUaUaUaUaUaU_ I attached a screenshot of FM receiver 's GRC. Can you help me to detect if there are some parameters which are wrong ? Best regards, Wafa HAJ HMIDA ---
**Author:** ![wafa\_e](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/b4bc9f/32.png) [@wafa\_e](https://www.ruby-forum.com/u/wafa_e)\ **Post date:** [June 12, 2014, 12:35pm UTC](https://www.ruby-forum.com/t/getting-noise-for-fm-receiver-with-usrp-e110/230348/2 "2014-06-12T12:35:43Z")
The SBX has a frequency range of 400MHz to 4.4GHZ which is why you cannot tune to broadcast FM stations between 88-108MHz: > **[SBX-40 400 MHz - 4.4 GHz Rx/Tx, 40 MHz BW - Ettus Research](https://www.ettus.com/all-products/SBX/)** > > The SBX-40 is a wide bandwidth transceiver for the USRP Software Defined Radio (SDR) platform. The SBX-40 provides 40 MHz of bandwidth and 400 MHz to 4.4 GHz frequency coverage. Mike – Mike J. M0MIK BSc MIET Email: removed\_email\_address@domain.invalid Web: [http://scanoo.com](http://scanoo.com) On Thu, Jun 12, 2014 at 11:14 AM, Wafa E. via USRP-users \< ---
**Author:** ![wafa\_e](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/b4bc9f/32.png) [@wafa\_e](https://www.ruby-forum.com/u/wafa_e)\ **Post date:** [June 12, 2014, 2:17pm UTC](https://www.ruby-forum.com/t/getting-noise-for-fm-receiver-with-usrp-e110/230348/3 "2014-06-12T14:17:47Z")
On 06/12/2014 06:14 AM, Wafa E. wrote: > - The hardware does not support the requested RX frequency:\* > > Best regards, > > Wafa HAJ HMIDA > > * * * > > Discuss-gnuradio mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) > Two issues: The SBX doesn’t support that frequency. The audio subsystem on E110 doesn’t support a sample rate of 96k ---
**Author:** ![wafa\_e](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/b4bc9f/32.png) [@wafa\_e](https://www.ruby-forum.com/u/wafa_e)\ **Post date:** [June 16, 2014, 11:22am UTC](https://www.ruby-forum.com/t/getting-noise-for-fm-receiver-with-usrp-e110/230348/4 "2014-06-16T11:22:12Z")
Thanks a lot for your reply. In fact, in order to respect the band range frequency of the SBX daughterboard Rev 5.1. I sent an FM signal from a signal generator called _NI PXIe-5673_ described in this link: [PXI Vector Signal Generator - NI](http://sine.ni.com/nips/cds/view/p/lang/en/nid/205593). The signal that I generated, it is a sinus and has _900_ \*MHz \*frequency. So that I created my proper FM station on 900 MHz to respect the band range frequency allowed by SBX daughterboard Rev 5.1. In order to receive the signal generated by usrp e110, I implemented an FM receiver flow graph on usrp e110 which is attached below and I used an VERT900 Antenna, described in this link: [VERT900 Antenna | Ettus Research, a National Instruments Brand | The leader in Software Defined Radio (SDR)](https://www.ettus.com/product/details/VERT900) . But I still have noise generated by usrp e110. Have you an idea if there is a non suitable parameter on the flow graph ? Thanks in advance Best regards, Wafa HAJ HMIDA 2014-06-12 12:33 GMT+02:00 Mike J. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![wafa\_e](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/b4bc9f/32.png) [@wafa\_e](https://www.ruby-forum.com/u/wafa_e)\ **Post date:** [June 12, 2014, 5:53pm UTC](https://www.ruby-forum.com/t/getting-noise-for-fm-receiver-with-usrp-e110/230348/5 "2014-06-12T17:53:16Z")
I just received my B200 and facing the same issue. The B200 supports 70Mhz upwards, wonder why I am just getting noise. There is no error while running it. Anyone tried this with B200? Thanks Hari Marcus D. Leech wrote in post #1149608: > On 06/12/2014 06:14 AM, Wafa E. wrote: > > > - The hardware does not support the requested RX frequency:\* > > > > Best regards, > > > > Wafa HAJ HMIDA > > > > * * * > > > > Discuss-gnuradio mailing list > > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) > > Two issues: > > The SBX doesn’t support that frequency. > > The audio subsystem on E110 doesn’t support a sample rate of 96k