902 Mhz band plan and experimental frequencies

Due to the lack of interest (and amateur rigs by the manufacturers) the 33cm band is wide open, if you don't count interference or non-interference from ITS, Part 15 and the ISM radio services. We will dispense with any part of the band plan that does not address spectrum for experimental purposes, data transmission or narrowband FM (i.e. repurposed Motorola GTX and Kenwood units). This is what it looks like here in Minnesota.

902.3125–902.4875 Narrowband FM/DV repeater inputs (25 Khz spacing)
902.500 Simplex (15Khz)
902.8500-902.9750 Narrowband repeater inputs (25 Khz spacing)
902.9875 Narrowband SNP repeater input
903.425-906.975 Digital
916.025-918.975 Digital
927.3125–927.4875 Narrowband repeater outputs (25 KHz spacing)
927.600 Alternate FM Simplex (15 Khz wide channel)
927.700 Alternate FM Simplex (15 Khz wide channel)
927.800 Alternate FM Simplex (15 Khz wide channel)
927.8500-927.9750 Narrowband repeater outputs (25 Khz spacing)
927.9875 Narrowband SNP repeater output

904.00-909.750 and 919.000-928.000 are designated for Intelligent Transportation Systems. They are the primary users of this part of the spectrum and the Amateur Radio Service cannot cause harmful interference. Part 97.303(n)(1)(i-iii) states, that in the 33cm band, Amateur stations must not cause harmful interference to, and must accept interference from, stations authorized by the United States Government; the FCC in the Location and Monitoring Service; and other nations in the fixed service.

Researching 902-928 Mhz on the FCC ULS website, these are the active ITS frequencies in use within 50 miles of a point just south of downtown Minneapolis. They include users like the railroads, spectrum speculators and an airport:

901.95-902.00 (not in affected sub band)
902.25 (not in affected sub band)
903.00 (50K0N0N emission within 2 km of MSP Airport - 25 khz from SNP repeater input)
903.75 (within digital sub band)
904.00-909.75 (within the digital sub band to 906.975)
910.00 (not in affected sub band)
911.50 (not in affected sub band)
913.00 (not in affected sub band)
913.10 (not in affected sub band)
913.75 (not in affected sub band)
915.00 (not in affected sub band)
917.00 (within the digital sub band 916.025-918.975)
917.75 (within the digital sub band 916.025-918.975)
918.50 (within the digital sub band 916.025-918.975)
918.75 (within the digital sub band 916.025-918.975)
921.00 (not in affected sub band)
921.75-927.25 (not in affected sub band)
927.25-927.50 (within Wisconsin simplex sub band)
927.75-928.00 (within simplex and narrow band repeater output sub bands)

You cannot transmit on the SNP frequency within 2 km of MSP International. Generally, you have to be careful about which frequencies you can use and where you can use them. Using FCC ULS search, determine if your signal would radiate on a  frequency and within a bandwidth is in use by a licensed service.

(BTW, I need to update this post with the ITS bandwidth information - that will further restrict Amateur Service use of the band.)