Actually we are "mulitcasting".
Simulcasting is several transmitters on the same freq.
Yes, the two channels are transmitting the same traffic.
The new freq transmitter(s) are already narrowband.
The old freq transmitters will be narrow banded once the radio fleet gets programmed.
The existing freq is five site simulcast.
The new freq will also be five site simulcast.
Once the fleet of subscriber radios gets reprogrammed, there will be two Law channels.
The users still have not decided what to call them.
And nearly all the time the systems will be tied together, or used as a Car to Car option in addition to TAC.
There just isn't enuf money ( or need most of the time ) for two separately dispatched channels.
A similar thing will be happening on Fire soon also.