Re: [Discuss-gnuradio] not able to play fm receiver application

[Sahoo, Anirudha]

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.

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Sahoo, Anirudha
Sent: Friday, September 21, 2012 5:22 PM
To: address@hidden
Subject: [Discuss-gnuradio] not able to play fm receiver application

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.



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