Please note that simplex frequencies are not coordinated with the possible exception of
national simplex frequency Amateur
Again, please note that the simplex frequencies are a shared resource and that one must be considerate of other users of the frequency. Contact Us. Note that Canada largely follows the US national calling frequencies so our friends north of the border can be included in this scheme.
Just because you don't hear anything on a particular frequency, do NOT assume that it is unused! Rick Hanzlik. These examples below assume ONLY height change and take into account no other factors involved to change the amount of power getting to the transmitting antenna nor have there been any changes to the receive antenna unless specified.