What are the four general types of communications services in the hf band?

What are the four general types of communications  services in the hf band?
by

1 Answer

Answer :

Point-to-point, ship-to-shore, ground-to-air, and fleet broadcast.
by

Related questions

Highest frequency that can be used for skywave HF communications between two given points on earth. A. Gyro frequency B. Maximum usable frequency C. Critical frequency D. Virtual frequency

Description : Highest frequency that can be used for skywave HF communications between two given points on earth. A. Gyro frequency B. Maximum usable frequency C. Critical frequency D. Virtual frequency

Last Answer : B. Maximum usable frequency

What four switched networks are part of the defense communications system?

Description : What four switched networks are part of the defense communications system?

Last Answer : AUTOVON, AUTOSEVOCOM, AUTODIN, and DSSCS.

What frequency band is referred to as the metric waves? A. VHF B. UHF C. HF D. SHF

Description : What frequency band is referred to as the metric waves? A. VHF B. UHF C. HF D. SHF

Last Answer : A. VHF

Where does the AM broadcast band located in the spectrum band? A. HF band B. VHF band C. LF band D. MF band

Description : Where does the AM broadcast band located in the spectrum band? A. HF band B. VHF band C. LF band D. MF band

Last Answer : D. MF band

Which frequency band is the standard AM radio broadcast? A. HF B. UHF C. MF D. VHF

Description : Which frequency band is the standard AM radio broadcast? A. HF B. UHF C. MF D. VHF

Last Answer : C. MF

In what frequency band is the ATIS normally broadcasted? a. LF b. HF c. ADF d. VHF

Description : In what frequency band is the ATIS normally broadcasted?  a. LF  b. HF  c. ADF  d. VHF

Last Answer : d. VHF

Which frequency band is a wavelength of 1200m? a. UHF b. LF c. HF d. MF

Description : Which frequency band is a wavelength of 1200m? a. UHF b. LF c. HF d. MF

Last Answer : b. LF

In what frequency band is the ATIS normally broadcasted? a. LF b. HF c. ADF d. VHF

Description : In what frequency band is the ATIS normally broadcasted? a. LF b. HF c. ADF d. VHF

Last Answer : d. VHF

What are the two types of communications satellites?

Description : What are the two types of communications satellites?

Last Answer : Passive and active.

What are the two types of electrical communications?

Description : What are the two types of electrical communications?

Last Answer : Radio and wire.

The frequency of Ku band for satellite communications. A. 6/4 GHz B. 14/11 GHz C. 12/14 GHz D. 4/8 GHz

Description : The frequency of Ku band for satellite communications. A. 6/4 GHz B. 14/11 GHz C. 12/14 GHz D. 4/8 GHz

Last Answer : B. 14/11 GHz

What is the current frequency band given most attenuation for satellite communications? A. Ku B. C band C. J D. P

Description : What is the current frequency band given most attenuation for satellite communications? A. Ku B. C band C. J D. P

Last Answer : A. Ku

For navigation as well as marine and aeronautical communications and radar, ____ band is used. A. L B. K C. S D. J

Description : For navigation as well as marine and aeronautical communications and radar, ____ band is used. A. L B. K C. S D. J

Last Answer : A. L

What is the quardband between transponder channels in the commercial C-band for satellite communications? A. 6 MHz B. 36 MHz C. 4 MHz D. 2 MHz

Description : What is the quardband between transponder channels in the commercial C-band for satellite communications? A. 6 MHz B. 36 MHz C. 4 MHz D. 2 MHz

Last Answer : C. 4 MHz

Which of the following communications lines is best suited to interactive processing applications? a. narrow band channel b. simplex lines c. full duplex lines d. mixed band channels

Description : Which of the following communications lines is best suited to interactive processing applications? a. narrow band channel b. simplex lines c. full duplex lines d. mixed band channels

Last Answer : full duplex lines

Why is detector saturation not generally a problem in fiber optic communications systems?

Description : Why is detector saturation not generally a problem in fiber optic communications systems?

Last Answer : Because fiber optic communications systems operate at low optical power levels.

What are the two limitations to an active satellite communications system?

Description : What are the two limitations to an active satellite communications system?

Last Answer : Satellite down-link transmitter power and up-link receiver sensitivity.

What was the major operational limitation of early communications satellites?

Description : What was the major operational limitation of early communications satellites?

Last Answer : The lack of suitable power sources.

A typical satellite communications operational link consists of a satellite and what two other components?

Description : A typical satellite communications operational link consists of a satellite and what two other components?

Last Answer : Earth terminals.

What are the five most prominent communications modes of operation?

Description : What are the five most prominent communications modes of operation?

Last Answer : Simplex, half-duplex, semiduplex, duplex, and broadcast.

The naval communications system is made up of what two groups of communications?

Description : The naval communications system is made up of what two groups of communications?

Last Answer : Strategic and tactical.

What are the disadvantages of radiotelephone communications?

Description : What are the disadvantages of radiotelephone communications?

Last Answer : Static, enemy interference or a high local noise level.

Why is radiotelephone one of the most useful methods of military communications?

Description : Why is radiotelephone one of the most useful methods of military communications?

Last Answer : It is direct, convenient and easy to use.

What is the main advantage of radiotelegraph communications?

Description : What is the main advantage of radiotelegraph communications?

Last Answer : Reliability.

What are the three fundamental requirements of a military communications system?

Description : What are the three fundamental requirements of a military communications system?

Last Answer : Reliability, security, and speed.

The transmission of still images over an electrical communications system is known as what?

Description : The transmission of still images over an electrical communications system is known as what?

Last Answer : Facsimile.

What type of modulation do most analog fiber optic communications systems use?

Description : What type of modulation do most analog fiber optic communications systems use?

Last Answer : Intensity modulation.

One of the first satellite system catering personal based communications services scheduled for operation. A. Iridium system B. Plutonium system C. Indium system D. Gallium system

Description : One of the first satellite system catering personal based communications services scheduled for operation. A. Iridium system B. Plutonium system C. Indium system D. Gallium system

Last Answer : A. Iridium system

What are the four general types of filters?

Description : What are the four general types of filters?

Last Answer : a. Low-pass. b. High-pass c. Bandpass d. Band-reject..

What type filter is used to block the passage of current for a narrow band of frequencies, while allowing current to flow at all frequencies above or below this band?

Description : What type filter is used to block the passage of current for a narrow band of frequencies, while allowing current to flow at all frequencies above or below this band?

Last Answer : . Band-reject.

What type filter is used to allow a narrow band of frequencies to pass through a circuit and attenuate all other frequencies above or below the desired band?

Description : What type filter is used to allow a narrow band of frequencies to pass through a circuit and attenuate all other frequencies above or below the desired band?

Last Answer : Bandpass.

What is the band of frequencies called that is included between the two points at which current falls to 70 percent of its maximum value in a resonant circuit?

Description : What is the band of frequencies called that is included between the two points at which current falls to 70 percent of its maximum value in a resonant circuit?

Last Answer : Bandwidth of the circuit

When a wide band of frequencies is transmitted simultaneously, each frequency will vary in the amount of fading. What is this variable fading called?

Description : When a wide band of frequencies is transmitted simultaneously, each frequency will vary in the amount of fading. What is this variable fading called?

Last Answer : Selective fading.

What transmitter component allows the radiation of a large number of discrete frequencies over a wide band?

Description : What transmitter component allows the radiation of a large number of discrete frequencies over a wide band?

Last Answer : . Frequency synthesizer.

What device sweeps a band of frequencies to determine frequencies and amplitudes of each frequency component?

Description : What device sweeps a band of frequencies to determine frequencies and amplitudes of each frequency component?

Last Answer : Spectrum analyzer.

What happens to the electrons of a gallium-arsenide semiconductor when they move from the normal low-energy conduction band to the high-energy conduction band?

Description : What happens to the electrons of a gallium-arsenide semiconductor when they move from the normal low-energy conduction band to the high-energy conduction band?

Last Answer : The electrons become immobile.

A resistor is handed to you for identification with the following color code: the first band is blue, followed by gray, green, gold, and brown. What is the resistor’s value?

Description : A resistor is handed to you for identification with the following color code: the first band is blue, followed by gray, green, gold, and brown. What is the resistor’s value?

Last Answer : 6,800,000 ohms (6.8 mega ohms), with 5% tolerance, and a 1% reliability level.

The same resistor mentioned in question 63 has a yellow fifth band. What does this signify?

Description : The same resistor mentioned in question 63 has a yellow fifth band. What does this signify?

Last Answer : The resistor’s chance of failure is 0.001 percent for 1000 hours of operation.

A carbon resistor has the following color bands: The first band is yellow, followed by violet, yellow, and silver. What is the ohmic value of the resistor?

Description : A carbon resistor has the following color bands: The first band is yellow, followed by violet, yellow, and silver. What is the ohmic value of the resistor?

Last Answer : 470,000 ohms (470 kilo ohms).

Why does the Navy only use the upper and lower ends of the mf band?

Description : Why does the Navy only use the upper and lower ends of the mf band?

Last Answer : Due to the commercial broadcast (AM) band.

Tape winding errors can cause a deformed tape pack. What are four common types of tape pack deformation?

Description : Tape winding errors can cause a deformed tape pack. What are four common types of tape pack deformation?

Last Answer : Cinching, pack slip, spoking, and windowing.

You see a build-up of dust and lint on the take-up reel of a tape recorder. This can cause which of the four types of tape errors?

Description : You see a build-up of dust and lint on the take-up reel of a tape recorder. This can cause which of the four types of tape errors?

Last Answer : Signal dropout errors and level errors. The dust and lint on the reel will eventually get onto the tape where it can get between the tape and the recorder’s heads.

What are four types of tape errors that can degrade a magnetic recording system’s performance?

Description : What are four types of tape errors that can degrade a magnetic recording system’s performance?

Last Answer : Signal dropout, noise, skew, and level. Dropout is the most common.

What are the four basic transmitter types?

Description : What are the four basic transmitter types?

Last Answer : Am, fm, cw, ssb.

What are the four major types of instructions in the control section?

Description : What are the four major types of instructions in the control section?

Last Answer : Transfer, arithmetic, logic, and control.

Which Canon Vixia HF S10 camcorder battery will last more than two hours?

Description : Which Canon Vixia HF S10 camcorder battery will last more than two hours?

Last Answer : The longest lasting battery will have the highest current rating - the mAh rating. You might need to consider an external battery pack. Both are common on eBay and similar places. Leaving it to ... doesn't leave much time for other than direct purchase - possibly through the duty free stores.

What memory card do I have to use for the Canon Vixia HF S10 camcorder?

Description : What memory card do I have to use for the Canon Vixia HF S10 camcorder?

Last Answer : SDHC

Is the Canon Vixia HF S10 already set to HD?

Description : Is the Canon Vixia HF S10 already set to HD?

Last Answer : answer:The Vixia HF S10 is rated at 1080p so yes, it is HD However, YouTube HD is only capable of 720p resolution (still HD) and recommends these setting for your video: H.264, MPEG-2 ... you have a fast internet connection, otherwise you might find that videos don't play as quickly or smoothly.

New Canon Vixia HF S10, how many characters is there on the serial number and how to fix ImageMixer problem?

Description : New Canon Vixia HF S10, how many characters is there on the serial number and how to fix ImageMixer problem?

Last Answer : You might be entering it incorrectly. Does it have dashes or spaces between numbers that you entering or not entering?

What is the full form of 'HF' ? -How To ?

Description : What is the full form of 'HF' ? -How To ?

Last Answer : The full form of 'HF' is High Frequency