https://publicsafetyusa.blogspot.com/2021/05/fdny-radio-history-from-nyt-articles.html - 1930 - on 1,595 kc - 1953 - on 154 mhz FM - 2010 approx - on 482 mhz
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1930 - FCC license application - https://sites.google.com/site/fdnyfdny/home/1930
1970s late 1970s added CTCSS to repeater output channels but not on field units ???? from radioref forums
1982 - HT channels - https://sites.google.com/site/fdnyfdny/home/1982/1982-fdny-portable-radio-channels
2001 - problem with new digital radios - and 9/11 radio problems - https://sites.google.com/site/fdnyfdny/home/2001/march-2001-radio-failure
2002 - report on improving communications - https://sites.google.com/site/fdnyfdny/home/2002/2002-report-improving-comms
more years (at left) have more radio info