Battle Beacon cannot be deployed on a portal with a fracker (and vice versa)
Battle Beacon (BB) cannot be deployed on a portal with a fracker effective.
After the fracker is expired, BB can be deployed immediately.
Similarly, during BB is in effect, a fracker cannot be deployed on the portal.
Ten minutes after BB is finished (just after enhanced output is finished), fracker can be deployed.
Are these expected behaviour?
The announce of BB says that "A Battle Beacon can be deployed on a Portal with Fireworks or a Portal Fracker already deployed, because these effects will end prior to the conclusion of the 15-minute battle."