Re: [Discuss-gnuradio] USRP1 warning "requested RX frequency is outside of the system range, requested RX frequency is outside of the system range, and has been clipped " even though inside hardware specification

[Marcus D. Leech]

On 08/14/2015 06:21 AM, Hoang Nguyen Tran wrote:

Dear,

Sorry if I have too much question, I am getting started with GNU radio, and I did not find the answer for this on the Internet.

I have USRP1 and inside it has 2 daughter boards: WBX and RFX400.
I run the FM receiving grc file and got this

UHD Warning:
    Tune Request: 102.500000 MHz
      The ification:
        Target Frequency: 102.500000 MHz
        Clipped Target Frequency: 380.000000 MHz
      The RF LO does not support the requested frequency:
        Requested LO Frequency: 380.000000 MHz
        RF LO Result: 400.000000 MHz
      Attempted to use the DSP to reach the requested frequency:
        Desired DSP Frequency: 20.000000 MHz
        DSP Result: 20.000000 MHz
      Successfully tuned to 380.000000 MHz

I changed various frequency and figure out the range that has Successfully tuned is from 380Mhz to 520Mhz.
I don't know why this happen, the WBX suppose to have range from 50Mhz to 2200Mhz. Does it come from the wrong firmware ?
And moreover, my USRP has 2 daughter board, so how can I choose exact daughter board to use ? In UHD USRP source of GNU radio. only have options for antenna port for example RX2 or TX/RX, right ?

Best regards,

Hoang

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The UHD source includes a "subdev specification".

If your WBX is in the first slot, you'd use:

A:0

If your WBX is in the 2nd slot, you'd use:

B:0

As the subdevice specification.

You can use:

uhd_usrp_probe --args "type=usrp1"

To get a listing of the device configuration, including which slot your WBX and RFX2400 cards are in on the USRP1.