I have been noticing a 1 second on / 1 second off carrier at 30.53 KHz intervals on 40 meters. For instance I just captured a P3 screen showing the pulse at 6.97681, 7.03788, 7.06841 and 7.09894 MHz. At first I suspect a new switching power supply, but the signals are still there when running off a battery. Anyone know what this might be? I am puzzled. 73 ..mike AI6II
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