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[Discuss-gnuradio] SSB modulation with USRP2 Sink


From: Steve Mcmahon
Subject: [Discuss-gnuradio] SSB modulation with USRP2 Sink
Date: Sat, 18 Dec 2010 13:07:07 -0800 (PST)

Hello:

How can I get SSB modulation with the USRP2?

Currently I have a Signal Source producing a sine wave, and I've connected it 
into a USRP2 Sink. The spectrum of the output shows the upper sideband, the 
lower sideband, and the carrier. For example, if my tone is 1 MHz and I tune 
the USRP2 Sink to 900 MHz, then I see spikes at 901 MHz, 900 MHz, and 899 MHz.

I'd like to just get the upper sideband. The Signal Source outputs complex 
samples. I tried changing its output to float, and using a float-to-complex 
converter to input into the USRP2 Sink, but that didn't work. How can I do this?

Also, for some reason, the lower sideband is of a lower magnitude than the 
upper sideband. Why is this? Shouldn't they be of equal magnitude?

Thanks for your help.

Steve McMahon




      



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