SV: [Discuss-gnuradio] Re: USRP2 transmitter spectrum measurements

[Ulrika Uppman]

Hi!
We have encountered the same phenomena. The spikes at the carrier frequency 
seems to be especially large on the RFX400, but is also there on the RFX2400. 
We haven't been able to get rid of it, it's always there when transmitting. We 
think it might be an LO-effect.

Regards
//Ulrika and Patrik

-----Ursprungligt meddelande-----
Från: address@hidden [mailto:address@hidden För Jamin Chan
Skickat: den 24 juni 2009 23:02
Till: address@hidden
Ämne: [Discuss-gnuradio] Re: USRP2 transmitter spectrum measurements

has anybody else experienced this problem?  I am working on receiving an RF 
signal, performing processing on the data, and then retransmitting it, using a 
pair of RFX400s.  On the TX side, I always get this big carrier spike, even 
with no input to the RX side.  Ive tried just straight feeding the RX to the 
TX, same problem.  Sometimes if I stop and restart the program, the spike 
disappears.

I have noticed a slight DC offset on the RX data.. Ive tried saving the RX data 
to hard drive and removing the offset in Labview, then transmitting the new 
data, but the spike is still there

I can post spec-analyzer screenshots if needed
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