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Re: Re: Re: AD9361 56MHz RX bandwidth

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Hi dpu,

Thanks for providing the file with filter taps.

I pointed to this file from the IIO Scope and made the following settings, as per the screenshot below:

  • sample rate of 61.44 MHz
  • FDD mode
  • RF bandwidth of 56 MHz
  • manual gain of 71dB

txrx0718-IIOsettings.png

 

 

The RX spectrum I got is as follows:

RX-TX_56MHz_-87dBm_71dBgain.png

 

Corresponding spectra of individual I and Q components are as follows:

I_txrx_-87dBm_71dBgain.pngQ_tx_rx_-87dBm_71dBgain.png

First of all, above spectra of I and Q  are inexplicably different to one another. Then the RX spectrum (first screenshot above) doesn’t match the spectrum below (that appears as the right one), which was obtained by programming just the RX-FIR filter by the attached file rx0718.ftr, whose taps are the same of the second column of your file:

RX_56MHz_-87dBm_71dBgain.png

 

Find also below the corresponding spectra of I and Q components which do not match to any of I and Q spectra above.

I_rx_-87dBm_71dBgain.png

Q_rx_-87dBm_71dBgain.png



How can the same RX-FIR taps produce different spectra? How the spectrum obtained when programming both the RX and TX FIR filters can be made equal to the spectrum obtained when just the RX-FIR is programmed?

Ciro

 

P.S. this is the same issue I mentioned in post dated July 2th 14.21


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