Thank you, Matt. Is there any other way to transmit in the frequency range of 70M - 84M Hz? George
On Tue, Oct 20, 2009 at 6:31 PM, Matt Ettus <[email protected]> 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. > > Matt >
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