On 12/18/2010 04:07 PM, Steve Mcmahon wrote:
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
http://www.sbrac.org/files/ssb_xmitter.grc
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
http://www.sbrac.org
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