Re: [Discuss-gnuradio] Simultaneous RX/TX using RFX2400 Boards.

[David Scaperoth]

On Mar 7, 2007, at 1:47 PM, Tarun Tiwari wrote:

> Hi,
>
> I have written a code for simultaneous TX/RX for RFX2400 as  
> followed below:
>
> self.rx = usrp.source_c (0,self.decim)
> self.tx = usrp.sink_c (0, self.interp)
> .
> .
> .
> fg = my_graph()
> .
> .
> .
> fg.subdev.set_enable(True) # Enable transmitter
> fg.connect(fg.rx, fg.tx)
> .
> .
> .
>
> When I receive and then transmit, the waveform distortiton is very  
> high on transmit path. I used different combination for decimation  
> and interpolation rates, but that didn't work.

From your description above, you are transmitting whatever you  
receive (is this true?).

> I am recieving a sinusoid wave using RX2 port on 2.40GHz and  
> transmitting using TX/RX port on 2.48GHz.

I'm guessing that the sinusoid is coming from a waveform generator,  
or something.  Are you selecting the RX2 antenna?   
(subdev.select_rx_antenna("RX2"))  are you using a multiplication  
block on the transmitter?  What are you setting the Rx PGA gain to?

> Can somebody tell me about the reason for distortion?
>
> Thanks in advance.
>
> Regards,
> Tarun
> University of Texas -Dallas

David

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