無線電業餘愛好者使用手冊/傳輸頻率
美國
* WWV and WWVH * broadcasts on 2.5, 5, 10, 15, and 20 MHz * Power of 2500W on 2.5 and 20 MHz * Power of 10000W on 5, 10, and 15 MHz
加拿大
* CHU * Brodcasts on 3.330, 7.850, and 14.670 MHz * Power of 3000W on 3.330 and 14.670 MHz * Power of 10000W on 7.850 MHZ