example
An SFN offset delay 35us will avoid the “notches” in the middle of the SFN overlap area and move this “problem” to the distance 10 km far away where the amplitude difference between two RX signals is large enough to prevent an reoccur of the notches.
In general, the SFN offset delay will reduce the safety distance for SFN and could lead to the scenario 3 (see Fig. 3). This will not cause a problem if the power level between signals from TX1 and TX2 is greater than 35 dB in this Non-SFN area.