G9A - Antennas and Feed Lines
General Class
Antenna fundamentals: gain, front-to-back ratio, beamwidth, polarization
11 questions
Which of the following factors determine the characteristic impedance of a parallel conductor feed line?
What is the relationship between high standing wave ratio (SWR) and transmission line loss?
What is the nominal characteristic impedance of “window line” transmission line?
What causes reflected power at an antenna’s feed point?
How does the attenuation of coaxial cable change with increasing frequency?
In what units is RF feed line loss usually expressed?
What must be done to prevent standing waves on a feed line connected to an antenna?
If the SWR on an antenna feed line is 5:1, and a matching network at the transmitter end of the feed line is adjusted to present a 1:1 SWR to the transmitter, what is the resulting SWR on the feed line?
What standing wave ratio results from connecting a 50-ohm feed line to a 200-ohm resistive load?
What standing wave ratio results from connecting a 50-ohm feed line to a 10-ohm resistive load?
What is the effect of transmission line loss on SWR measured at the input to the line?