Thanks for the help, Matt. I never actually knew what DC offset was until now ;) Learning as I go!
>From what I understand, the USRP2 scales between -1.0 and 1.0. I am trying to boost my transmit power well over the power of the DC offset. I think that if I increase the gain, the DC offset is also boosted. So I am trying to boost my signal over it (for this 75dB separation). I am scaling my samples to the -1 and 1 range, but I am not seeing that much separation after scaling: http://cyprus.cmcl.cs.cmu.edu/~gnychis/boost.jpg That's about a 5dB separation after scaling. I am not adding any attenuation, and this is conducted. I am also configuring the gain to 0, so as to not boost the DC offset either. Thanks for the help, I appreciate it. - George On Wed, Aug 4, 2010 at 2:59 AM, Bob McGwier <rwmcgw...@gmail.com> wrote: > That is an awesome amount of LO suppression in an SSB mixer based system (I > mean the power 1/330000-th of the LO). A more interesting number given this > level of LO suppression would be the introduction of a tone (say) above the > LO at LO+F and to see what the power is at LO-F (the image). > > Bob > > > > > On 8/3/2010 4:55 PM, Matt Ettus wrote: > >> >> The WBX can put out about 20dBm at 520 MHz. -55dBm would be 75dB below >> the desired signal, which is quite a good amount of LO suppression. If >> you need more, you'll need to actively calibrate the DC offset to null >> it out. >> >> Matt >> >> >> On 08/03/2010 12:55 PM, George Nychis wrote: >> >>> The power of the tone comes in to the spectrum analyzer at -55.6dBm >>> >>> >>> > > > -- > (Co)Author: DttSP, Quiktrak, PowerSDR, GnuRadio > Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats, > NJQRP, QRP ARCI, QCWA, FRC. > “Be yourself, because the people who mind don't > matter. And the people that matter don't mind." > -Dr. Seuss > Active: Facebook,Twitter,LinkedIn > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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