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[Discuss-gnuradio] question about RFX2400

From: Malihe Ahmadi
Subject: [Discuss-gnuradio] question about RFX2400
Date: Tue, 04 Jan 2011 19:25:14 -0700
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20101207 Thunderbird/3.1.7


I am testing a transceiver link in ISM band using two USRP2+RFX2400, one configured as TX and the other one as RX. I would like to test my own FPGA program, so for now I have your FPGA codes in which I only changed the signal driving the DAC in TX to be an square wave (+8191 or -8192) with frequency about 400Hz. At the RX side, I am looking (using an oscilloscope) at the input to the ADC and what I see is quite like my square wave modulated with a carrier of couple of MHz. I looked at the schematic of RFX2400 and I didn't find any PLL or clock recovery circuitry! so I wonder how the frequency offset at RX could be avoided?


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