Question
What is the approximate length for a 1/2 wave dipole antenna cut for 3.550 MHz?
Answer Options
- A) 42 feet
- B) 84 feet
- C) 132 feet
- D) 263 feet
Correct Answer: C
Explanation
To find the approximate physical length of a half-wave dipole antenna (total end-to-end length), we use the common amateur formula: L_{\text{feet}} = 468 / F_{\text{MHz}}. This antenna is designed for the 80\text{-meter} band, so we use the frequency F = 3.550 \text{ MHz}.
Substituting the value: L_{\text{feet}} = \frac{468}{3.550} \approx 131.83 \text{ feet.} The approximate length for the dipole is 132 feet. This demonstrates how large the lower-band antennas must be compared to higher bands.
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