Dear experts, we have problem with SFN network, in DVB-T broadcasting.

We would like to ask you, how to measurement SFN network, when we have two different suppliers on the same frequency.

Now, we have two different modulators, and synchronization is not satisfied. SFN network is not synchronized. SFN does not working.

We would like to recognize, which supplier is cause interference in to the network.

We tested various transmit signals with different delay 60, 120, 200, 400us, problem is the same.

Thx, for any tips and tricks.