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

[Steve Mcmahon]

Hello Marcus:

Thanks a lot for providing the GRC file. I did not realize it was so 
complicated to create a SSB-modulated signal. I thought it might be a parameter 
of the USRP2 Sink block.

So the USRP2 Sink will always generate a full-modulated (both upper- and 
lower-sideband) signal? Because it inputs complex values?

Steve McMahon



--- On Sat, 12/18/10, Marcus D. Leech <address@hidden> wrote:

> From: Marcus D. Leech <address@hidden>
> Subject: Re: [Discuss-gnuradio] SSB modulation with USRP2 Sink
> To: address@hidden
> Date: Saturday, December 18, 2010, 4:18 PM
> 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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