On 13/12/11 07:59 AM, Paul M. Bendixen wrote: > > > 2011/12/13 Josh Blum <j...@ettus.com <mailto:j...@ettus.com>> > > > > On 12/12/2011 08:25 PM, Phone Naing MYINT wrote: > > Hi, > > > > TX is clear, defaulted to TX/RX. RX default to direct > conversion, what does it mean? > > RFX2400 is a direct conversion receiver *and* a direct conversion > transmitter. What the docs really should say: > > 1) When you tune the transmit chain, the default behaviour is to tune > the LO away from the desired center frequency. > > 2) When you tune the receive chain, the default behavior is to > tune the > LO as close as possible to the desired center frequency. > > You can of course, override this behavior: > http://files.ettus.com/uhd_docs/manual/html/general.html#tuning-notes > > > I would personally reccomend you to use this (and scrap GRC) as soon > as possible. > The RFX2400 board has some problems selecting a center frequency far > enough off, and you might run into trouble if you are using a digital > modulation (You can see some of my earlier posts on this) > > GRC allows you to use advanced tuning--why "scrap GRC" ??
> > > For receive, using TX/RX or RX2 provides same performance? > > > > TXRX vs RX2 is just a simple switch. You must pick what is most useful > for your application (full vs half duplex). Obviously, for a > receive-only application, either antenna option is good. > > > If you use the TX/RX as a receiver, you will notice a small > attenuation (~2dB) compared to using RX2. > Also remark, that the attenuation between TX/RX when transmitting and > RX2 is ~65 dB. > > -josh > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > Best Paul > > -- > . - - ./. -/. . -/. - . ./- . . ././- ./- . ./. ./- . . -/./- ./. - - > .- ./- - ./- -/. -/. ./. - . ./. - . - . -/- . - ./- - -/- -// > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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