2011/12/13 Josh Blum <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) > > > 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 > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > Best Paul -- * - - */* -/* * -/* - * */- * * */*/- */- * */* */- * * -/*/- */* - - *- */- - */- -/* -/* */* - * */* - * - * -/- * - */- - -/- -//
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