Do they use Motobridge up there, or another system?Perhaps the BC has a PAPD radio checked out at a command post. FDNY vehicles do not have EDACS radios.
The more likely scenario is they are using UTAC/ITAC frequencies. NYC has the ability to cross patch them when required.
That would make complete sense because it was during the fatal crash on the cross Bronx. BC was talking to the PA about checking cameras as they were unsure of the exact location of the crash initially.Simple answer.
Some Fdny units have papd radios. For example bc13 has a radio for the George Washington bridge.