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I am really interested in how going from 100% modulation to 125% modulation increases the range from about 1.25 miles as Mojoe reported to an additional mile as you claim which would be 2.25 miles. Perhaps there are some confounding variables such as installation details which account for the range advantage?
If I calculated this right, 125% modulation on a 100 mW. transmitter would yield a power of 100 mW. in the carrier plus the sidebands power of 78 mW. for a total of 178 mW. compared to a carrier of 100 mW. at 100% modulation which would produce sidebands power of 50 mW. for a total of 150 mW. Since the field strength is inversely proportional to the distance, the 125% modulated transmitter shoud produce an increased of range on the order of 25% assuming that the sideband power provides the range advantage. This does not reconcile with what you reported unless there are other factors to consider.