Deep Dive: G9A06
The correct answer is D: Decibels per 100 feet. The units in which RF feed line loss is usually expressed are decibels per 100 feet. Feed line loss is typically specified as dB loss per 100 feet at a specific frequency. For amateur radio operators, this is the standard way to specify feed line loss. Understanding this helps when comparing feed lines.
Why Other Answers Are Wrong
Option A: Incorrect. Ohms per 1,000 feet is for resistance, not loss - loss is in decibels, not ohms. Ohms aren't loss units. Option B: Incorrect. Decibels per 1,000 feet is too long - standard is per 100 feet, not 1,000 feet. 1,000 feet is wrong. Option C: Incorrect. Ohms per 100 feet is for resistance, not loss - loss is in decibels, not ohms. Ohms aren't loss units.
Exam Tip
Feed line loss units = decibels per 100 feet. Think 'F'eed 'L'ine 'L'oss = 'd'B per '1'00 feet. Feed line loss is typically specified as dB loss per 100 feet at a specific frequency. Not ohms, not per 1,000 feet - just dB per 100 feet.
Memory Aid
Feed line loss units = decibels per 100 feet. Think 'F'eed 'L'ine 'L'oss = 'd'B per '1'00 feet. Feed line loss is typically specified as dB loss per 100 feet. Standard feed line loss unit.
Real-World Example
A coaxial cable specification: Loss = 2.5 dB per 100 feet at 100 MHz. This tells you how much signal is lost in 100 feet of cable at that frequency. Feed line loss is always expressed in decibels per 100 feet - this is the standard unit. This is how feed line loss is specified.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G9A
Reference: 2023-2027 Question Pool · G9 - Antennas and Feed Lines
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G9A topic.