# Not able to play fm receiver application **URL:** \ **Category:** GNU Radio\ **Created:** [September 21, 2012, 11:24pm UTC](https://www.ruby-forum.com/t/not-able-to-play-fm-receiver-application/223107 "2012-09-21T23:24:47Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\ **Post date:** [September 21, 2012, 11:24pm UTC](https://www.ruby-forum.com/t/not-able-to-play-fm-receiver-application/223107/1 "2012-09-21T23:24:47Z")
Hi, I have a USRP N210 with basicRX daughterboard. I ran uhd\_wbfm\_receive.grc application. But I cannot tune to any FM radio station. I get warning like * * * UHD Warning: The hardware does not support the requested RX frequency: Target frequency: 88.500000 MHz Actual frequency: -11.500000 MHz > > > gr\_fir\_ccf: using SSE > > > gr\_fir\_fff: using SSE > > > audio\_alsa\_sink[hw:0,0]: unable to support sampling rate 40000 > > > card requested 44100 instead. * * * There was a similar post in the archive, but the reply said, it is ok to get this warning. If the card supports 88.5 MHz, then why is it not able to receive the station? I read somewhere that basicRX daughterboard needs an external RF component. Is the problem arising because I do not have an external RF component? If so, what kind of external RF component I should buy (from Ettus?)? Here is the usrp\_probe output linux; GNU C++ version 4.4.6 20120305 (Red Hat 4.4.6-4); Boost\_104100; UHD\_003.004.003-221-g9d6f9492 – Opening a USRP2/N-Series device… – Current recv frame size: 1472 bytes – Current send frame size: 1472 bytes UHD Warning: The recv buffer could not be resized sufficiently. Target sock buff size: 50000000 bytes. Actual sock buff size: 131071 bytes. See the transport application notes on buffer resizing. Please run: sudo sysctl -w net.core.rmem\_max=50000000 UHD Warning: The recv buffer could not be resized sufficiently. Target sock buff size: 50000000 bytes. Actual sock buff size: 131071 bytes. See the transport application notes on buffer resizing. Please run: sudo sysctl -w net.core.rmem\_max=50000000 UHD Warning: The send buffer could not be resized sufficiently. Target sock buff size: 1048576 bytes. Actual sock buff size: 131071 bytes. See the transport application notes on buffer resizing. Please run: sudo sysctl -w net.core.wmem\_max=1048576 – Detecting internal GPSDO… not found UHD Warning: Unable to set the thread priority. Performance may be negatively affected. Please see the general application notes in the manual for instructions. EnvironmentError: OSError: error in pthread\_setschedparam * * * / | Device: USRP2 / N-Series Device | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | / | | Mboard: N210r4 | | hardware: 2577 | | mac-addr: a0:36:fa:25:40:2f | | ip-addr: 192.168.10.2 | | subnet: 255.255.255.255 | | gateway: 255.255.255.255 | | gpsdo: none | | serial: E2R20PFUP | | FW Version: 12.3 | | FPGA Version: 10.0 | | | | Time sources: none, external, _external_, mimo | | Clock sources: internal, external, mimo | | Sensors: mimo\_locked, ref\_locked | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | RX DSP: 0 | | | Freq range: -50.000 to 50.000 Mhz | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | RX DSP: 1 | | | Freq range: -50.000 to 50.000 Mhz | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | RX Dboard: A | | | ID: Basic RX (0x0001) | | | Serial: EAR00ZFRB | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | RX Frontend: AB | | | | Name: BasicRX (AB) | | | | Antennas: | | | | Sensors: | | | | Freq range: -250.000 to 250.000 Mhz | | | | Gain Elements: None | | | | Connection Type: IQ | | | | Uses LO offset: No | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | RX Frontend: BA | | | | Name: BasicRX (BA) | | | | Antennas: | | | | Sensors: | | | | Freq range: -250.000 to 250.000 Mhz | | | | Gain Elements: None | | | | Connection Type: QI | | | | Uses LO offset: No | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | RX Frontend: A | | | | Name: BasicRX (A) | | | | Antennas: | | | | Sensors: | | | | Freq range: -250.000 to 250.000 Mhz | | | | Gain Elements: None | | | | Connection Type: I | | | | Uses LO offset: No | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | RX Frontend: B | | | | Name: BasicRX (B) | | | | Antennas: | | | | Sensors: | | | | Freq range: -250.000 to 250.000 Mhz | | | | Gain Elements: None | | | | Connection Type: Q | | | | Uses LO offset: No | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | RX Codec: A | | | | Name: ads62p44 | | | | Gain range digital: 0.0 to 6.0 step 0.5 dB | | | | Gain range fine: 0.0 to 0.5 step 0.1 dB | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | TX DSP: 0 | | | Freq range: -250.000 to 250.000 Mhz | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | / | | | TX Dboard: A | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | TX Frontend: 0 | | | | Name: Unknown (0xffff) - 0 | | | | Antennas: | | | | Sensors: | | | | Freq range: 0.000 to 0.000 Mhz | | | | Gain Elements: None | | | | Connection Type: IQ | | | | Uses LO offset: No | | | \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ | | | / | | | | TX Codec: A | | | | Name: ad9777 | | | | Gain Elements: None thanks. ---
**Author:** ![SahooS\_Anirudha](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/a87d85/32.png) [@SahooS\_Anirudha](https://www.ruby-forum.com/u/SahooS_Anirudha)\ **Post date:** [September 25, 2012, 10:04pm UTC](https://www.ruby-forum.com/t/not-able-to-play-fm-receiver-application/223107/2 "2012-09-25T22:04:14Z")
I contacted Ettus Tech support. They said that basicRx card samples at higher Nyquist region. So, it requires external RF gain and filtering component. Can someone suggest such a RF component which I can buy off-the-shelf which can work with basicRx card? Thanks. ---
**Author:** ![SahooS\_Anirudha](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/a87d85/32.png) [@SahooS\_Anirudha](https://www.ruby-forum.com/u/SahooS_Anirudha)\ **Post date:** [September 25, 2012, 10:31pm UTC](https://www.ruby-forum.com/t/not-able-to-play-fm-receiver-application/223107/3 "2012-09-25T22:31:07Z")
> I contacted Ettus Tech support. They said that basicRx card samples > at higher Nyquist region. So, it requires external RF gain and filtering > component. > Can someone suggest such a RF component which I can buy off-the-shelf > which can work with basicRx card? > > Thanks. One of these: > **[FM Bandpass Filter](https://scott-inc.com/html/fm_bpass.htm)** > > notch filter trap -FM Blanketing interference solver Coupled perhaps with one of these: [http://www.summitsource.com/24-db-dual-output-uhf-vhf-fm-distribution-amplifier-tv-signal-magnavox-m61111-booster-tv-aerial-antenna-broad-band-amp-2-way-audio-video-part-m61111-p-4642.html](http://www.summitsource.com/24-db-dual-output-uhf-vhf-fm-distribution-amplifier-tv-signal-magnavox-m61111-booster-tv-aerial-antenna-broad-band-amp-2-way-audio-video-part-m61111-p-4642.html) You might need to play connector plumbing. That was just in 2.5 minutes of googling. – Marcus L. Principal Investigator Shirleys Bay Radio Astronomy Consortium > **[Live Draw HK Tercepat | Result HK | HK Pools | Live HK | HK Prize Hari Ini](https://www.sbrac.org/)** > > Temukan live draw hk tercepat melalui halaman hk pools yang resmi dan dapatkan result hk prize melalui live hk secara langsung di situs kami.