Re: [USRP-users] Switching and high spike in spectrum

On 10/29/2014 01:54 PM, bob wole via USRP-users wrote:

When I run top flowgrpah (without transmitting anything) and observe
of the band.
That spike in the middle is a consequence of using direct conversion in
general-purpose SDRs, that isn’t possible to do “as manufactured”, you

Yes, I know that LO leakage/DC offset is an issue present in direct
conversion receiver. But as I mentioned earlier, the received spectrum
looks fine (a very little spike at DC around -70dB) while the burst
transmission is not running. The spike becomes much more significant (
spike at DC -20dB) when burst transmission (tx_time,tx_eob, tx_sob )
starts and all the spectrum just shifts up and down with it. I am using
TX/RX antenna in both usrp source and usrp sink. I want to know why the
burst transmission is affecting the received spectrum on the same node.