Question about Fail to set RF frequency in certain range using Basic TX

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.

George

On Tue, Oct 20, 2009 at 4:43 PM, George L. [email protected]
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.

What version of gnuradio and operating system are you using? OSX?

Thomas

Yes, OSX, Leopard.
Gnuradio is 3.2.2

George L. 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

Not at this time, but soon.

Matt

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

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