Technically, MotoTRBO uses TDMA technology whereas NXDN (ICOM, Kenwood, and Ritron radios) use FDMA technology. For your reading enjoyment, we invite you to read a white paper prepared by ICOM. We believe it is fair and balanced, to borrow a phrase from a major news network. Go to www.info4u.us/FDMA-TDMA-Comparisons.pdf for the full report. If nothing else, we think you will find it to be very informative.
As a final comment, we should point out that there are multiple FCC emission designators for NXDN radios. Elsewhere on our Blog we earlier published emission designators for ICOM 6.25 kHz radios (IDAS). For the sake of clarity, we through it would be worthwhile to also provide the designators for both voice and data at both 12.5 and 6.25 kHz channel spacing as follows:
8K30F1E - 12.5 kHz single channel digital voice, 8K30F1D - 12.5 kHz single channel digital data, 8K30F1W - 12.5 kHz single channel digital voice and data - 4K00F1E - 6.25 kHz single channel digital voice - 4K00F1D - 6.25 kHz single channel digital data, 4K00F1W - 6.25 kHz single channel, digital voice and data,4K00F2D - 6.25 kHz single channel analog CW ID. (Ref: Wikipedia.org).