Is it safe to turn on a ePMP2000 conectorized, without the antena connected to configure it?

Is it safe to turn on a ePMP2000 conectorized, without the antena connected at the lab to configure it and link the subscribers modules?

I do it all the time. I just turn power down low. You can also use 2 of these to safely absorb full power. You will still get enough radiation to connect close by SMs.