What's your sine?
A unit of frequency representing 1 cycle per second
What is a Hertz?
Sensitive to moisture intrusion and UV radiation, and with a 50-ohm impedance, this connects a radio to the antenna
What is coaxial cable?
P = I x E
What is the equation to calculate power?
A special ham radio station, which sends out a signal on a fixed frequency 24 hours a day, used for checking propagation so you can assess whether a frequency band is useable at that moment to the part of the world where the beacon is situated.
A term used to describe the rapid fluttering sound sometimes heard from mobile stations that are moving while transmitting
What is Picket Fencing?
300,000,000 meters per second
What is the velocity of a radio wave traveling through free space?
This antenna is inefficient and rather dinky, but often what you get with hand-held radios
What is a rubber duckie antenna?
A diode that will emit light at a PN junction when current flows through it.
What is an LED?
A voluntary guideline for using different modes or activities within an amateur band
What is the Band Plan?
Communication by signals reflected by the ionized meteor trails in the upper atmosphere
What is Meteor Scatter?
The quotient of the speed of light over frequency
What is wavelength?
This antenna is highly directional and provides lots of gain
What is a Yagi or beam antenna?
A switch that automatically interrupts or shuts off an electric circuit at the first indication of overload. Can be reset/reused.
What is a circuit breaker?
The most basic type of amateur radio operator license currently available from the FCC
A type of VHF propagation that can occur when warm air overruns cold air (a temp. inversion) and the higher refractive index of the atmosphere causes the signal to bend instead of shoot straight through the atmosphere, allowing signals to reach up to 800 miles away
What is tropospheric ducting?
Frequencies between 300 MHz and 3 GHz
Whta is UHF?
This device matches the antenna system input impedance to the transmitter, receiver, or transceiver output impedance
A circuit where resonant frequencies are changed because you've used a variable capacitor or inductor
Frequency range available for phone (voice) operation by operators holding tech licenses
What is 28.300 MHz to 28.500 MHz
Interference caused when a receiver receives two or more signals--a direct signal and one or more reflected signals. The multiple signals may interfere with one another
What is multipath?
The phenomenon wherein a two waves cancel each other out
What is a 180-degree phase shift?
This is a measure of how well a load is matched to a transmission line (1:1 is perfect! would result in reduced signal loss)
What is Standing Wave Ratio?
Field Effect Transistor that has a gate, drain, & source. Often used in digital circuits as these devices take a miniscule amount of current to turn on. They are activated by a change in voltage. You could describe them as voltage controlled current amplifiers
What is a FET?
An amateur station located more than 50 km above Earth's surface
What is the Part 97 definition of a Space Station?
The angle at which electromagnetic waves and waves in magnetic fields are opposed
What is 90 degrees?