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The pluto-sdr tx and self rx,but the frequency in the iio is strange?

Question asked by djc001 on Oct 11, 2017
Latest reply on Oct 12, 2017 by travisfcollins

Please look at the file attached;

In the file test1.png,the tx freq and the rx freq is same,both are 409MHz,the ant of rx and tx both on the board;In the IIO Info say the DC is 409M,I think this is good as mine espect;But Ins the file test2.png,I have move the tx freq from 409M to 410MHz,and In the IIO Info,the fund (largest signal freq is 406M).As I expect the most strongest signal freq shoud be 410M;Why at 406M?I have used spectrum instrument to check the tx freq is right?Can you give me some suggestion?Maybe the 3rd intermod(3RX-3TX) or other reason?Tks;