Dear Marcus, At the receiver USRP, does the SBX daughtercard have any mechanism of phase-lock-loop (PLL) ? I guess the daughtercard should have it because PLL is essential for quadrature downconversion. Please advise, thanks. Regards, activecat
On Sat, Jan 11, 2014 at 1:19 PM, Marcus Leech <marcus.le...@ettus.com>wrote: > No, it means that the upconverter is a direct-conversion, quadrature > upconverter that produces a real output from the complex baseband and the > quadrature local oscillator on the SBX. > > > > On Fri, Jan 10, 2014 at 9:53 PM, Activecat <active...@gmail.com> wrote: > >> Dear Marcus, >> When using GRC, the USRP sink (for N210 with SBX daughtercard) receives >> complex input. >> This means both I and Q data are fed into the USRP from the PC. Then the >> I and Q data are sent to the SBX after DUC. >> If SBX just perform plain analog upconversion, does it mean that I and Q >> are upconverted to different carrifer frequencies? >> Please advise, thanks. >> Regards, >> activecat. >> >> >> > On Wed, Jan 1, 2014 at 12:17 AM, Marcus Leech <marcus.le...@ettus.com>wrote: >> >>> The SBX card is an analog upconverter. It takes your baseband signal, >>> in this case, a pure 5kHz tone, and mixes it >>> with a 500Mhz (in this example) carrier, and produces a 500.005Mhz >>> carrier to the antenna. >>> >>> >>> >> >>> On Tue, Dec 31, 2013 at 1:09 AM, Activecat <active...@gmail.com> wrote: >>> >>>> Dear Sir, >>>> I run this command with SBX daughterboard on N210: >>>> /usr/local/lib/uhd/examples/tx_waveforms --freq 500e6 --wave-type >>>> SINE --wave-freq 5e3 --rate 10e6 >>>> What is performed at the SBX, does it multiply (Frequency Modulation) >>>> the 5kHz SINE wave with the 500MHz carrier frequency ..? >>>> Thanks. >>>> Regards, >>>> activ...@gmail.com >>>> >>>
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