Question
Except in some parts of Alaska, what is the maximum power permitted on the 630-meter band?
Answer Options
- A) 50 watts PEP (peak envelope power)
- B) 100 watts PEP (peak envelope power)
- C) 1 watt EIRP (equivalent isotropic radiated power)
- D) 5 watts EIRP (equivalent isotropic radiated power)
Correct Answer: D
Explanation
The 630-meter band (472-479 kHz) is another low-frequency allocation for the Amateur Radio Service. Similar to the 2200-meter band, the power limit is specified as the Effective Isotropic Radiated Power (EIRP) to account for system gains and losses. This limit is in place to protect other radio services, particularly Power Line Carrier (PLC) systems, which operate in this frequency range.
The FCC sets the maximum power for the 630-meter band at 5 Watts EIRP. This means that the total power radiated from the antenna, taking into account transmitter output power, antenna gain, and line losses, must not exceed 5 Watts. The exception for some areas in Alaska reflects specific regional frequency management needs.
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