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emc problem about radiation emission on GPIO at PUSH-PULL mode

Question asked by on Oct 17, 2015
Latest reply on Oct 18, 2015 by
I use STM32F373, freq of PLL is 72MHz.
If one pin (PD1, PD2 or any pin) is configured in PUSH-PULL mode, then 144MHz harmonic is immediately 
detected at this pin by the near field probe with one spectrum analyzer.
If this pin is configured in OPEN DRAIN mode with PULL UP, harmonic is disappeared.

Does anybody can explain such  appearance and tell me how to disappear such harmonic when in PUSH-PULL mode?
Any help is appreciated.