|
A sample of measurements above and below the loading coil with various
antenna above the coil (current as percent of reference) follow:
| |
Toroid with hat |
Small 2×2″ coil with 24″ hat up 24″ |
Long 12×3″ coil with 24″ hat up 24″ |
Long 12×3″coil with 6′ whip |
| Current below |
100% |
100 |
100 |
100 |
| Current above |
100 |
94.4 |
73 |
76% |
| |
Toroid with whip |
long 12×1.5″ coil with 6′ whip |
long 12×1.5″ coil with 24″ hat |
Small 2×2″ coil with 6′ whip |
| Current below |
100% |
100 |
100 |
100 |
| Current above coil |
100% |
79% |
75% |
96% |
| Current in whip 1ft above top of coil |
|
73% |
|
|
The most revealing thing was how noticeably small changes in stray
capacitance near the middle and top of the loading coil affect current
distribution. It was quite evident hanging a large meter on each end of the coil
would greatly perturb the system.
|