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Re: [Discuss-gnuradio] Question about Fail to set RF frequency in certai

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Question about Fail to set RF frequency in certain range using Basic TX
Date: Fri, 23 Oct 2009 10:13:54 -0700
User-agent: Thunderbird (X11/20090825)

Not at this time, but soon.


George Lee wrote:
Thank you, Matt. Is there any other way to transmit in the frequency range of 70M - 84M Hz?


On Tue, Oct 20, 2009 at 6:31 PM, Matt Ettus <address@hidden <mailto:address@hidden>> wrote:

    George Lee wrote:

        When I tried to set the center frequency to 80M using Basic Tx
        board, the error message I got is as follows. I also tried some
        other frequency, from 70M - 84M , and had the same error. For
        most of the other frequency, it works fine. $ ./usrp_siggen.py
        --const -i 32 -f 80M usb_control_msg failed:
        usb_control_msg(DeviceRequestTO): pipe is stalled Using TX
        d'board A: Basic Tx Failed to set RF frequency Does anyone know
        the reason for this and how to solve this? Thank you very much.

    The DAC sample rate is 128 MS/s, and due to the sinc shape of DACs
    it means there would be very low signal around nyquist (64 MHz) and
    its multiples.  So we don't let you set those frequencies as you
    wouldn't get much signal anyway.



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