In some situations, a simplex channel is helpful during an operation. Of course, an unused frequency is the best choice.
We have chosen the frequency of, 147.52 MHz. This particular frequency seems to be unused in our area, is far enough away from our two repeater input frequencies so as not to cause desense, and is easy to remember – nationwide calling frequency (146.52 + 1 MHz).
Please program in this frequency in all your radios.