Deep Dive: E1A09
The correct answer is D: 5 watts EIRP (equivalent isotropic radiated power). Except in some parts of Alaska, the maximum power permitted on the 630-meter band is 5 watts EIRP (equivalent isotropic radiated power). 630-meter band has low power limits to prevent interference. For amateur radio operators, this is important for low-band operation. Understanding this helps ensure legal operation.
Why Other Answers Are Wrong
Option A (50 watts PEP): Incorrect. 50 watts PEP is too high - 630-meter band limit is 5 watts EIRP. 50W is too high. Option B (100 watts PEP): Incorrect. 100 watts PEP is too high - 630-meter band limit is 5 watts EIRP. 100W is too high. Option C (1 watt EIRP): Incorrect. 1 watt EIRP is too low - 630-meter band limit is 5 watts EIRP. 1W is too low.
Exam Tip
630m band maximum power = 5 watts EIRP. Think '6'30m = '5' watts EIRP. 630-meter band has low power limits (5 watts EIRP) to prevent interference. Not 50W PEP, not 100W PEP, not 1W EIRP - just 5 watts EIRP.
Memory Aid
630m band maximum power = 5 watts EIRP. Think '6'30m = '5' watts. 630-meter band has low power limits (5 watts EIRP) to prevent interference. Low power limit for low-band operation.
Real-World Example
The 630-meter band: Maximum power permitted (except in some parts of Alaska) is 5 watts EIRP (Equivalent Isotropic Radiated Power). This is a low power limit - much lower than other bands. The low limit is to prevent interference to other services. 5 watts EIRP is the maximum - this is the power limit for 630 meters.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E1A
Reference: FCC Part 97.313
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E1A topic.