Jeff Brower wrote: > The LFRX has two separate antenna inputs, supplied to Vin-A and > Vin-B. These are not I-Q data. USRP board FPGA logic would apply > one mixer or two (30 MHz or less).
[...] > The RFX2400 mixes with a 2.4 GHz osc and creates one set of I-Q 65 > MHz range signals, +/-I on Vin-A and +/-Q on Vin-B. To get baseband > signals, the logic has to apply two mixers. The FPGA DDC logic uses a single but *complex* mixer to do frequency conversion of the signal from the ADCs. That is, it treats the data from Vin-A and Vin-B as a complex number in I and Q format, and multiplies this complex number by a complex sinusoid of a configurable frequency. This is very different from having two mixers. -- Johnathan Corgan Corgan Enterprises LLC http://corganenterprises.com _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
