HF Antenna Systems Flashcards
1
Q
What frequency band is HF?
A
3MHz to 30 MHz
2
Q
Name 5 HF antenna Systems?
A
- Simple Dipole
- 3 Wire Folded
- 8 Wire Cage Dipole
- 8 Wire Cage Quadrant
- Rhombic
- Wide Band (WB) Antenna
- Log Periodic Horizontal (LPH)
3
Q
What are the two common Constant Figures used to determine HF Antenna dimensions?
A
- 143 - Simple half Wave Dipole.
* 131 - 8 Wire Cage Dipole/Quadrant Antenna.
4
Q
If not annotated on a drawing, where would you find an Antenna’s Constant Figure?
A
AP 116E-1717-1H
5
Q
Calculate the length of a Simple Half Wave Dipole operating at 12MHz?
A
L = Constant divided by Frequency
L = 143 / 12MHz
143 / 12 = 11.92m
6
Q
Calculate the amount of copper wire (Inc. 10% wastage) required for an 8 Wire Cage operating at 10MHz?
A
L = Constant divided by Frequency
L = 131/10MHz
131 / 10 =13.10m
- 10m x 8 = 104.80m
- 80m + 10% = 115.28m
