on 13.560 MHz your allowed a f/s of 10mV/m @ 30m. what would this equal in TPO to a coaxial 1/2 wave verticle or dipole?
on 13.560 MHz your allowed a f/s of 10mV/m @ 30m. what would this equal in TPO to a coaxial 1/2 wave verticle or dipole?
How does this compare to a Rangemaster running 100 mW input to final RF into 3m monopole on a grounded 10ft mast?
trying to get an understanding of the range this is capable of.
For the 13.56 MHz system, an EIRP of about 0.9 mW will generate ~ 10 mV/m over a 30 m path (assumes 100% ground reflection). A 1/2-wave dipole has a peak gain of ~ 2.2 dBi, so the input power to it would need to be reduced by 2.2 dB (about 40%) from that 0.9 mW. The power needed at the dipole feedpoint would be about 0.54 mW.
In an earlier post I showed a field of 2.4 mV/m at 62.5 m for a very good, ground mounted Part 15 AM setup on 1700 kHz. At 30 m that field would rise to about 5 mV/m. Assuming the same system when using a 10 foot radiating ground lead/mast had about 6 dB more gain, then its field at 30 m will be about ~ 10 mV/m.
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