ATO test 1 Exam |57 Questions and
Answers A+ Graded
Types of electrical telecommunications - -Radio: sends transmits and
receives information via airborne electromagnetic waves the military is most
important method of communication
Wire: use of conductors to carry information
- Radio communications - -The term describes teletypewriter, voice,
telegraphic and facsimile communication
- Radio frequency (RF) - -Any frequency of electromagnetic energy capable
of propagation (transmission) into space frequencies between 3 kHz and 300
GHz are use for radio communication
- Audio frequency (AF) - -Any frequency out of all of the human ear.
Frequency between 20 Hz and 20 kHz.
- Carrier frequency - -Any electromagnetic frequency that can be modulated
to transmit speech, music, images or signals.
- Intelligence - -Information or data that is intelligible to our senses,
normally audio or video.
- Modulation - -The process of impressing intelligence upon a transmission
medium.
- Heterodyning - -The process of mixing to signals to Bruce's some,
difference, and the two originals. The sum is known as the upper side band
and the difference is the lower sideband.
- Amplitude modulation (AM) - -Any method of varying the frequency of an
electromagnetic carrier in accordance with the intelligence to be
transmitted.
- Frequency modulation (FM) - -Any method of varying the frequency of
electromagnetic carrier in accordance with the intelligence to be
transmitted.
- Continuous wave modulation (CW) - -The basic form of RF
communications. It is essentially on-off keying off an RF carrier. Interrupted
continuous wave (ICW): transmission of brief first seminar of carrier to form
dots and dashes of Morse code.
, - Main three frequencies - -High frequency (HF) 3 kHz-30 MHz
Very high frequency (VHF) 30 MHz-300 MHz
Ultra high frequency (UHF) 300MHz-3 GHz
- Microwave frequencies - -Frequencies between 1 GHz and 300 GHz. The
UHF, SHF, and EHF bands make up the microwave region of the frequency
spectrum
- Disadvantages to radiotelegraph - -Slow transmission speed
Requirement for experienced operator at both ends
- Radio telephone - -Used by ships, aircraft, and shore stations for short
range tactical communications.
- Teletypewriter - -Military commercially
Military uses radio teletypewriter for high-speed automatic communications
- Facsimile (FAX) - -The process used to transmit photographs, charts, and
other graphic information electronically.
- One way communication - -Communication and One Direction only.
Transmitter antenna on one end. Receiver and antenna on the other end.
Example radio/TV.
- Two-way communication - -Communication in both directions
- Suppression - -Elimination of an undesired portion of a signal
- Fading - -Reduction of signal strength due to the differences in phase
relationship of incoming signals.
- Attenuation - -The weakening of a single due to atmospheric or system
losses.
- Oscillator - -A circuit that generates an AC signal at a frequency
determined by the value of its components in a constipate amplitude.
- Capacitive diode (varactor) - -A semi conductor diode who's capacitance
varies with the applied voltage
- Three commonly used transmitters - -AM
FM
SSB
- Sensitivity - -The ability of a receiver to reproduce weak signals.
Answers A+ Graded
Types of electrical telecommunications - -Radio: sends transmits and
receives information via airborne electromagnetic waves the military is most
important method of communication
Wire: use of conductors to carry information
- Radio communications - -The term describes teletypewriter, voice,
telegraphic and facsimile communication
- Radio frequency (RF) - -Any frequency of electromagnetic energy capable
of propagation (transmission) into space frequencies between 3 kHz and 300
GHz are use for radio communication
- Audio frequency (AF) - -Any frequency out of all of the human ear.
Frequency between 20 Hz and 20 kHz.
- Carrier frequency - -Any electromagnetic frequency that can be modulated
to transmit speech, music, images or signals.
- Intelligence - -Information or data that is intelligible to our senses,
normally audio or video.
- Modulation - -The process of impressing intelligence upon a transmission
medium.
- Heterodyning - -The process of mixing to signals to Bruce's some,
difference, and the two originals. The sum is known as the upper side band
and the difference is the lower sideband.
- Amplitude modulation (AM) - -Any method of varying the frequency of an
electromagnetic carrier in accordance with the intelligence to be
transmitted.
- Frequency modulation (FM) - -Any method of varying the frequency of
electromagnetic carrier in accordance with the intelligence to be
transmitted.
- Continuous wave modulation (CW) - -The basic form of RF
communications. It is essentially on-off keying off an RF carrier. Interrupted
continuous wave (ICW): transmission of brief first seminar of carrier to form
dots and dashes of Morse code.
, - Main three frequencies - -High frequency (HF) 3 kHz-30 MHz
Very high frequency (VHF) 30 MHz-300 MHz
Ultra high frequency (UHF) 300MHz-3 GHz
- Microwave frequencies - -Frequencies between 1 GHz and 300 GHz. The
UHF, SHF, and EHF bands make up the microwave region of the frequency
spectrum
- Disadvantages to radiotelegraph - -Slow transmission speed
Requirement for experienced operator at both ends
- Radio telephone - -Used by ships, aircraft, and shore stations for short
range tactical communications.
- Teletypewriter - -Military commercially
Military uses radio teletypewriter for high-speed automatic communications
- Facsimile (FAX) - -The process used to transmit photographs, charts, and
other graphic information electronically.
- One way communication - -Communication and One Direction only.
Transmitter antenna on one end. Receiver and antenna on the other end.
Example radio/TV.
- Two-way communication - -Communication in both directions
- Suppression - -Elimination of an undesired portion of a signal
- Fading - -Reduction of signal strength due to the differences in phase
relationship of incoming signals.
- Attenuation - -The weakening of a single due to atmospheric or system
losses.
- Oscillator - -A circuit that generates an AC signal at a frequency
determined by the value of its components in a constipate amplitude.
- Capacitive diode (varactor) - -A semi conductor diode who's capacitance
varies with the applied voltage
- Three commonly used transmitters - -AM
FM
SSB
- Sensitivity - -The ability of a receiver to reproduce weak signals.
