Amateur ExtraE9C09
Which of the following describes a G5RV antenna?
A
Answer
Antennas and transmission lines
Type
A
A wire antenna center-fed through a specific length of open-wire line connected to a balun and coaxial feed line
B
A multi-band trap antenna
C
A phased array antenna consisting of multiple loops
D
A wide band dipole using shorted coaxial cable for the radiating elements and fed with a 4:1 balun
Answer Notes
The G5RV antenna, named after its inventor Louis Varney (G5RV), is a highly popular multi-band wire antenna. It fundamentally consists of a center-fed dipole (typically 102 feet long) fed by a specific length of parallel conductor line, such as open-wire or ladder line (usually about 34 feet).
This matching section transforms the high impedance at the center of the antenna on various bands to a more manageable value. The open-wire line then terminates into a balun and standard coaxial cable, which runs to the transceiver.
Distractors often describe other types of multi-band antennas. For example, the G5RV does not use resonant traps like a multi-band trap dipole, nor does it use shorted coaxial elements for radiation, making the other options incorrect.
Previous · E9C08
What is a folded dipole antenna?
Next · E9C10
Which of the following describes a Zepp antenna?