https://en.wikipedia.org/wiki/Communication_during_the_September_11_attacks

check this out - very detailed info

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153.83 - primary fireground channel - maybe aka Tac 1

the Ch 30 repeater (at the wtc complex) was on the same freq pair as
the "Citywide" repeater IIRC - maybe 154.43R - the Citywide repeater
had to be shut down when the WTC repeater was activated - otherwise
the 2 repeaters would interfee with each other if both were used at
the same time - and both might have used the same PLs which would
cause the 2 repeaters to activate at the same time

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