Hi, I am working on USRP N210 with a WBX (Revision 2) daughterboard. The WBX daughterboard uses ADF 4350 to generate a frequency signal which feeds into the mixer in the RX chain.
We want to have a control over the frequency signal generated by ADF 4350 (this is a differential signal available on pins RFOut A+/-) and hence we have erased the connection between CPout pin to Vtune pin and feed a constant (or varying) voltage signal to Vtune pin. (This signal is generated externally through say a voltage power supply). We then run uhd_fft -f <some frequency> to set up the default register values within ADF 4350 and try to feed a voltage signal of constant or varying magnitude between 0.5V to 2.4V. When we monitor the frequency signal coming out of RFOutA+/- we see that it's a constant frequency signal which varies only when we run uhd_fft with a different frequency setting. Frequency signal does not vary as we sweep our voltage signal (feeding to Vtune) from 0.5V to 2.4V. Assuming that all the connections are proper and we are feeding a valid voltage signal to Vtune, can someone tell me what might be going wrong possibly in our setup? For your reference, this is the schematic of the WBX daughterboard (check page 3) - https://files.ettus.com/schematics/wbx/WBX.pdf Datasheet of ADF 4350 - http://www.analog.com/media/en/technical-documentation/data-sheets/ADF4350.pdf Thanks, Rohit
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