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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: Tue, 20 Oct 2009 18:31:18 -0700
User-agent: Thunderbird (X11/20090825)

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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