Hi Eric -
Thank you for your reply. I incorrectly used the wording offset
between the 2 daughter cards where I meant to say that the absolute
offset (of the 2 daughter cards) is unknown at the start of a run.
This has been observed after many experiments so far with my
interferometer like project and causes a run to run inconsistency.
I have worked out a calibration procedure where I begin with a known
geometry (transmitter to receiver placement) and observe the scope;
and then reconfigure the flow graph by a keypress without stopping
the app. This will be accomplished by use of "app.set_volume()" in
the main program and a "def set_volume(self, volume):" in the flow
graph that includes the scope as a sink.
The modifications to the main part of multi_scope.py that I have
tried are below. When I run this I get a scope but do not get the
prompt in the terminal window. When I click on the close window of
the scope window I do get the prompt.
def main ():
app = stdgui2.stdapp (test_top_block, "O'Scope Test App")
app.MainLoop ()
raw_input ('Press Enter to end CALIBRATE and start RUN (amplify x now):')
raw_input ('Press Enter to stop: ')
app.stop()
if __name__ == '__main__':
main ()
# ----------------------------------------------------------------
Take care,
- Larry
At 03:40 PM 1/26/2009, Eric Blossom wrote:
On Sun, Jan 25, 2009 at 11:34:34PM -0800, Larry Wagner wrote:
> Hi -
>
> I have a USRP with 2 RFX2400 daughter cards and need to calibrate the
> local oscillator (LO) offset between them. To do this I want to modify
> the multi_scope.py example to allow me to reconfigure the flow graph
> without stopping. This is based on some external measurement I will do
> followed by a keypress and possibly an input using raw_input().
Larry,
If the 2 RFX2400 cards are attached to the same USRP, there will be no
LO offset between them. They are driven by a common ref clock provided
by the USRP motherboard.
Eric
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