Per the ARRL band plan, the simplex allocated areas are from 146.420 to 146.570 and again from 147.420 to 147.570.
In the Western United States:
Nevada, Arizona, New Mexico, Utah, Oregon, Washington, and Idaho, have been designated to use 20 KHz frequency spacing. California, and Colorado designated to use 15 KHz frequency Spacing.
The following simplex frequency band plan shows both 20 KHz spacing "channels" for Nevada and 15 KHz for California. Please use the appropriate frequencies for the area your in. Although used in some areas, using 146.480, 146.580, 147.420 and 147.570 transmits a portion of your signal out of plan, and therefore should not be used.
Keep in mind that while many states use the 20 KHz spacing, not all states or areas use the same frequencies. Check your local clubs to obtain local variations on the band plan.
20 KHz Spacing
15 KHz Spacing
|146.400||Plan Edge - not usable||146.400|
|146.460||Freq. that fits both plans||146.460|
|146.520||National calling Freq||146.520|
|146.580||Plan Edge - not usable||146.580|
|147.420||Plan Edge - not usable||147.420|
|147.480||Freq that fits both plans||147.480|
|147.570||Plan Edge - not usable||147.570|