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Re: [Discuss-gnuradio] SSB modulation with USRP2 Sink

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] SSB modulation with USRP2 Sink
Date: Sat, 18 Dec 2010 16:18:16 -0500
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On 12/18/2010 04:07 PM, Steve Mcmahon wrote:

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


This does a narrow-band SSB transmitter using an audio source, and you can select upper or lower sideband. It uses the
  filter method.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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