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Re: [Discuss-gnuradio] USRP1 warning "requested RX frequency is outside


From: Marcus Müller
Subject: 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
Date: Fri, 14 Aug 2015 15:35:42 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

Hi Hoang,

the 380MHz is the lower frequency you can get with a RFX400. That's correct.

You can chose your daughterboard by using the number of channels argument (if you want both), or the subdev spec [1], like:
B:0
to select the WBX in your second slot.

Best regards,
Marcus

[1]http://files.ettus.com/manual/page_configuration.html#config_subdev

On 08/14/2015 12:21 PM, 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

--
 -HoangNT-
PhoneNo :  +841654248782
Skype : hoangastro


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