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Tim wrote: I have a 15W amp into a single tuned dipole about 8m off the ground. I am getting less than a mile with it. I have 17m of standard RG58 coax. do you think upgrading to RG213 coax will help with the range?
Hi, Tim –
It is a “given” that systems compliant with Part 15 FM as defined by the FCC may radiate no more than 250 microvolts per meter as measured 3 meters in any direction from the transmit antenna.
If your goal is to meet Part 15 FM, then you may use whatever combination of transmitter power, cable loss, and antenna gain as produces that peak field strength at that distance.
If FCC Rules are of no concern to you then anything you do to increase your radiated power will improve your distant field strength in that direction (other things equal).
BUT… a reality of physics is that about 11.43 nanowatts (0.000 000 01143 watts) radiated from a 1/2-wave dipole will produce this maximum Part 15 FM field.
Obviously, even if your cable loss meant that you radiated only 1 watt from a tuned dipole, that would still produce fields far, far in excess of the legal limit.
Even a power level of 1 milliwatt radiated by a 1/2-wave dipole will produce fields.that are non-compliant with FCC Part 15 FM.