NRF51822 dcdc TX distance

[zcmm]

Dear all: My device uses LDO mode and DC-DC mode respectively, and the distance is different.In 4dbm, the distance of the LDO mode is 110m, while the LDO mode is in the 70m.Who can tell me reason?

[zcmm]

version 3 AB chip,. Yeah,i test .my device can use ldo or dc-dc mode,the tx distance is different.Schematic diagram of the DC-DC mode is consistent with the official.