NIST report has lots of details about the radios that FDNY used - http://wtc.nist.gov/NCSTAR1/PDF/NCSTAR%201-8.pdf - you can search through this document for the word RADIO or MAYDAY
http://www.outreach.psu.edu/programs/interop/files/Interoperable-Communications.pdf - very basic info about 9/11 radio problems
https://sites.google.com/site/fdnyfdny/home/2002-report-improving-comms - 2002 FDNY Report - Improving Radio Communications
Two solutions to the 9/11 interop problems could have been - 1 firefighter with a 153.83 portable in the NYPD helo - or - 1 police officer with a NYPD portable radio at the FD Command Post - PS 4/4/2010