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Re: [Discuss-gnuradio] Viewing square wave in usrp_oscope
From: |
sudhindra aithal kota |
Subject: |
Re: [Discuss-gnuradio] Viewing square wave in usrp_oscope |
Date: |
Fri, 18 Nov 2005 18:23:38 +0000 (GMT) |
Hi,
I made the change but I get the following error when
I run usrp_oscope.py.
.
.
.
File
"/usr/local/lib/python2.3/site-packages/gnuradio/usrp1.py",
line 27, in _swig_getattr
raise AttributeError,name
AttributeError: set_dc_offset_cl_enable
Regards
Sudhindra
--- "address@hidden"
<address@hidden> wrote:
> I have been able to view square waves down to 1 KHz
> with the usrp_oscope.
> I do not use a daughterboard and I turned off the
> automatic DC offset. I
> input the signal into pins 62 and 60 of connector
> J666, of the USRP, with
> the use of appropriate coupling capacitor. I
> disabled the automatic DC
> offset by adding the following code:
>
> self.u = usrp.source_c() #
> usrp is data source
> self.u.set_dc_offset_cl_enable(0x0, 0xf) #
> Turn off auto dc offset
>
> I turned off the DC offset to get ride of a drop in
> the square wave. The
> DC offset algorithm tries to remove what it
> considers DC signal and that
> includes slow varying signals in the KHz range.
>
> Original Message:
> -----------------
> From: sudhindra aithal kota address@hidden
> Date: Fri, 18 Nov 2005 03:21:09 +0000 (GMT)
> To: address@hidden, address@hidden
> Subject: Re: [Discuss-gnuradio] Viewing square wave
> in usrp_oscope
>
>
> Hi,
> Sorry for the previous mail. Totally out of
> context.
>
> I gave a square wave input direct from a signal
> generator and the behaviour of usrp_oscope was the
> same as I had explained before. I increased the
> frequency to way above 100KHz. Is there any other
> option to be given?
>
> Regards
> Sudhindra
>
>
> > Hi,
> > Is it possible to view a square wave using
> > usrp_oscope.py? I have a circuit which produces a
> > square wave that I want to view.
>
> Yes.
>
> > I know usrp_oscope is not a general purpose
> > oscilloscope. We eventually want to manipulate the
> > signal coming from the circuit for our purposes.
> So
> we
> > wanted to know if it is represented properly.
> > The square wave had spikes in it. It appeared
> more
> > like a capacitor charging and discharging. And at
> high
> > frequencies, it resembles a sine wave. The signal
> > coming from the circuit has a frequency of 41 KHz.
>
>
> If you are using the Basic Rx daughterboard as your
> input, the RF
> transformer on it acts as a high pass filter.
> Try using an input signal > 100kHz. A megahetz
> would
> be even better.
>
> > Has anyone tried working with a square wave
> before
> > and faced this problem? Please let me know how to
> > correct this. Thanks
>
> The Basic USRP has a 50 Ohm input impedance.
> Will your circuit drive 50 ohms?
>
> Eric
>
>
>
>
>
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