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From: | Activecat |
Subject: | Re: [Discuss-gnuradio] undocumented SBX behavior |
Date: | Sun, 2 Feb 2014 20:03:29 +0800 |
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 <address@hidden> 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 <address@hidden> wrote:
The SBX card is an analog upconverter. It takes your baseband signal, in this case, a pure 5kHz tone, and mixes itwith 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 <address@hidden> 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 10e6What is performed at the SBX, does it multiply (Frequency Modulation) the 5kHz SINE wave with the 500MHz carrier frequency ..?Thanks.Regards,
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