Question
Which of the following direct, fused power connections would be the best for a 100-watt HF mobile installation?
Answer Options
- A) To the battery using heavy-gauge wire
- B) To the alternator or generator using heavy-gauge wire
- C) To the battery using insulated heavy duty balanced transmission line
- D) To the alternator or generator using insulated heavy duty balanced transmission line
Correct Answer: A
Explanation
A 100-watt HF transceiver draws a substantial amount of current (typically 20-25 amperes) during peak transmission. To ensure the radio receives a steady voltage and to minimize electrical noise, the DC power connection must be made directly to the primary power source, which is the vehicle’s battery.
Connecting to the battery using heavy-gauge wire (e.g., AWG #10 or larger) is the best choice. This minimizes voltage drop and resistance, and the battery acts as a large capacitor, providing a steady, filtered source of power that minimizes both conducted and radiated noise from the vehicle’s electrical system. The connection must be properly fused at the battery terminal for safety.
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