Legend
This calculator generates a lot of data! Take care in the use of the
information in order not to make mistakes...
Here's a little explanation:
- Design frequency
- Evident?
- Number of turns
- What's the twist of the antenna?
(normally 0.5 or 1 turns)
- Length of one turn
- A few variations of the antenna exist.
Normally the circumference (length of the loop) is 1 wavelength, but
1.5 wavelength and 2 wavelength versions exist (and work).
- Bending diameter
- As it's impossible to bend the corner
abruptly at 90 degrees, this value is needed for the calculations.
It's measure from the bending center to the center of the tube.
- Conductor diameter
- External diameter of the tube or
coax cable.
- Diameter/height ratio
- Most frequently this ratio is 0.44,
but slightly lower values (0.3 to 0.4) give better horizon coverage.
- Compensated wavelength
- Wavelength, compensated according
to the conductor diameter.
- Bending correction
- Correction value needed according to the
bending diameter.
- Compensated total length
- Total length of the loop,
compensated for the bending effect, and the fact that the loop must be
slightly larger (or smaller).
- Compensated vertical conductor
- Length of the vertical
conductor (without the 'bends').
- Compensated horizontal separation
- This is in fact the
horizontal part without the 'bends', and corresponds to the horizontal
pipe necessary to support the cable.
- Antenna height
- Height of the loop (twisted!).
- Internal diameter
- The diameter of the (imaginary) cylinder
on which the loop would be wound.
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(c) John Coppens ON6JC/LW3HAZ |
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