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[Discuss-gnuradio] Switching and high spike in spectrum

From: bob wole
Subject: [Discuss-gnuradio] Switching and high spike in spectrum
Date: Wed, 29 Oct 2014 22:54:52 +0500

USRPN210r4 with SBX

I am observing a strong spike at the center of the receive spectrum when I start burst transmission.

My top flowgraph contains following two hierarchical blocks
 1) A transmitter flow graph with (tx_time, tx_sob, tx_eob)
 2) A receiver flow graph 

When I run top flowgrpah (without transmitting anything) and observe the FFT of the received signal the spectrum does not contain high spike in the center.

But as soon as I start transmitting in burst mode I see a very high spike in center of the received signal FFT spectrum. It looks like LO (transmitter or receiver ) is being received? Which one is it ? And why is it happening?  How can I avoid it because it is affecting my packets. 

When I apply the offset in digital using DDC/DUC, the spike moves out of the band. 


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