RF Connectors Flashcards
RF connectors are used with what?
coaxial cable and available as plugs, jacks, panel jacks, and receptacles
What is the most common coaxial cable for aircraft radio equipment?
RG-58/U
Plugs are always what type of contacts?
Male
Jacks are always what type of contacts?
Female
What are the BNC series of connectors designed for?
small, lightweight, bayonet-type connections on small coaxial cable
The TNC series is similar to the BNC, except:
The TNC has a screw on connection and better noise level reduction and vibration resistance
What connectors are constructed so coaxial cable with dual shields can be properly terminated?
Triaxial connectors
each layer of shielding fits into a separate portion of the connector
What is Aeronautical Radio, Incorporated (ARINC)?
A major provider of transport communications and system engineering solutions for many industries
What is known as the incident wave?
Energy traveling in the correct direction is known as the incident wave
What happens if there is a bad antenna?
Some of the energy is reflected back from the load into the transmission line
What is reflected energy known as?
Reflected Wave
The energy from a standing wave will dissipate how?
in the form of heat
A shorted or open cable may cause the coaxial cable to act like what?
An inductor, capacitor, or resonant circuit
What are the characteristics of a short circuit?
maximum current, minimum voltage
A transmission line with a break before the 1/4 wave point causes what?
the reflected current to lead the reflected voltage, giving the appearance of a capacitor
If the open occurs between the 1/4 and 1/2 wave point, what happens?
The source voltage curve will appear to lead the current curve- giving the appearance of an inductor
If a short occurs in a transmission line at the exact point of the short then:
current is at a maximum and voltage is minimum
If a short occurs in a transmission line and the short occurs at exactly 1/4 wave then:
the source current is at a minimum and voltage is at maximum, giving the appearance of an open.
If a short occurs in a transmission line, the behavior of the reflected wave will be:
the exact opposite of those in an open line
What tool can be used to help with troubleshooting transmission lines connected to communication transmitters?
A Line Watt Meter
Where can the wattmeter be placed?
between the transmission line and the antenna or between the radio and the transmission line
If full transmitter power is measured at the radio but not at the antenna then:
something is wrong with the coaxial cable
What can also be used in place of a Line Watt Meter?
A Time Domain Reflectometer (TDR)
Used when there’s not anything connected to the cables
