[NLRS] 6m rover antennas

[Dr. Gerald N. Johnson, electrical engineer]

All the NEC programs have a subtle error in concept. When working over a
ground their gain figures in what they claim as dBi, are actually dB
over half isotropic. E.g. the reference isotropic radiator has only a
hemisphere of radiation and the energy from the lower hemisphere is
neglected, knocking the reference down to half power, e.g. -3.0103 dB.

This error of concept makes any antenna simulations over ground show
twice the gain they show in free space, even when the antenna is at a
very great elevation.

When I had source code for my Apple ][ for NEC-2, I put in a correction
for that 3 dB error over a ground plane.

73, Jerry, K0CQ
-- 
Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.