Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
27 Cards in this Set
- Front
- Back
|
Which freq is in the 12.5 centimeter band?
|
2.4GHz-2.5GHz
|
|
|
What type of wave carries radio signals between transmitting and receiving stations?
|
Electromagnetic Radio Waves
|
|
|
What is the cause of irregular fading of signals from ditant stations during times of generally good reception?
|
Random combining of signals arriving via different path lengths
|
|
|
What is the term for the distance a radio wave travels during on complete cycle?
|
wavelength
|
|
|
What term desribes the number o times per second that an alternating current reverses direction?
|
Frequency
|
|
|
What are the two components of a radio wave?
|
Electric and magnetic fields
|
|
|
How d oes the w avelength of a radio wave relate to its frequency?
|
The wavelength gets shorter as frequency increases
|
|
|
What is the formula for converting frequency to wavelngth in meters?
|
300/freq in Mghz = Wavlength in meters
|
|
|
What is the "Systeme International" unit of frequency? |
Hertz
|
|
|
if used, where is an RF amp installed? |
After Radio before antenna
|
|
|
Which of the following may be useful in correcting a radio frequency interference problem?
|
Low-pass high pass filters snap on ferret chokes band reject and band pass filters |
|
|
In general terms what is Standing wave ratio?
|
A measure of how well a load is match to a transmision line
|
|
|
What is true regarding vertically polarized antennas
|
Electric field perpendicular to earth
|
|
|
Which of the following describes a simple dipole mo unted so the conductor is parallel to the Earth's surface?
|
Horizonally polarized Antenna
|
|
|
How wuold you change a dipole antenna to make it resonant on a higher frequency?
|
Shorten the antenna |
|
|
What is meant by the gain of an antenna?
|
The increase in signal srength in a specified direction whn compared to a reference antenna
|
|
|
What is meant by dBBBI as applied to antennas?
|
dB above an isotropic radiator |
|
|
Which description best fits that of a SMA connector?
|
An ill threaded connecor suitable for signals up to several GHz
|
|
|
What is the name of the process that changes the phase a ngle of a RF wave t oconvey information?
|
Phase modulation
|
|
|
What type of modulation varies the instantaneous power level of the RF signal?
|
Amplitude modulation
|
|
|
The four types of fading are interference, polarization, __________, and __________.
|
Absorption and skip
|
|
|
What determines the polarization of a radiated wave?
|
the direction of the electric field lines of force
|
|
|
When a Radio Frequency signal bends around an object, this propagation behavior is known as what?
|
Diffraction
|
|
|
When multiple Radio Frequency signals arrive at a receiver at the same time and are _______ with the primary wave, the result can be _______ of the primary signal.
|
out of phase, 180 degrees out of phase
|
|
|
2 dBd is equal to how many dBi?
|
4.15
|
|
|
In a normal wireless bridged network, the greatest loss o signal is caused by what component?
|
Free Space path loss
|
|
|
To double the d istance of a signal, the EIRP must be increased by how many DBs?
|
6dB
|
