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Configure FMCOMMS2 with Zed board

Question asked by AnilKumarS on Aug 4, 2015
Latest reply on Sep 23, 2015 by DragosB

Hi,

 

I am working on FMCOMMS2 interfaced with ZedBoard . When i am configuring this first time using the No OS Driver API ad9361_init I can see my Tx1 synthesizer frequency spectrum in my spectrum analyzer. after initialisation during run time i used ad9361_set_tx_lo_freq API to set required Synthesizer LO frequency . This API is also working fine and i can see the corresponding spectrum in my spectrum analyzer . But some times when i use this API the power level of the signal is getting down , again when i call the same API with other frequency then its giving required power level . I mean for a particular frequency only some times i am getting high power and some times low power .

What is the mistake in my procedure.How to solve this issue.

 

May i know is there any procedure to set the Tx Lo frequency using API .

 

i would like to know when this ad9361_set_tx_lo_freq API is called , is there any effect to power of the signal . and what are the parameters that are effected with this API.

 

Here i am attaching my test result .

Here the first one is freq=2GHz with high power using API ad9361_set_tx_lo_freq.

second one is with freq=2.1GHz but getting low power.

tx_lo_freq_2GHz with high power.jpg

tx_lo_freq_2_1_GHz_with_low_power.jpg

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