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that emerged in the 80s and were implemented in the mid to late 90s that allowed these systems to develop. So one of the concepts that HAMS may have become more custom to thanks to DMR radios is TDMA and FDMA. So FDMA stands for frequency division multiple access and TDMA stands for time division multiple access. If you're thinking back to the old cell phones that were CDMA they use code division multiple access. But prior to that cell phones that were strictly analog they use time division multiple access. Except they were analog and the time division multiple access was really just you're using this channel now when you hang up somebody else because you use the same channel. It wasn't true time division multiple access. So what these different modes do is they essentially