Re: [Discuss-gnuradio] Viewing square wave in usrp_oscope

[Eric Blossom]

On Wed, Nov 16, 2005 at 01:01:53AM +0000, sudhindra aithal kota wrote:
> 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