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

From: David Scaperoth
Subject: Re: [Discuss-gnuradio] Simultaneous RX/TX using RFX2400 Boards.
Date: Wed, 7 Mar 2007 20:13:52 -0500

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


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.

University of Texas -Dallas


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