Quantcast NAVY FREQUENCY BAND USE

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Custom Search
 
  
Table 1-1.-Radio-Frequency Spectrum NAVY FREQUENCY BAND USE Table 1-1 shows the radio-frequency spectrum broken down into bands that are used by the military. Each band of frequencies has its own characteristics. Navy Electricity and Electronics Training Series, Module 17, Radio-Frequency Communications Principles, discusses all the bands. This chapter will only discuss the bands that are of interest to the Aviation Electronic Technician. VLF and LF Band Communications The very low frequency (VLF) and low frequency (LF) bands were originally used for radio telegraphy. Because the wavelengths were in the kilometer range and higher (30 kHz has a wavelength of 10 kilometers, or about 6.2 miles), enormous antennas had to been used. With today’s technology, this is no longer a factor. MF and HF Band Communications The medium-frequency (MF) and high-frequency (HF) bands are not only used by the Navy, but portions are also used by commercial AM broadcasting stations. These spectrums also include the international distress frequencies (500 kHz, 2182 kHz, 8364 kHz, 3023.5 kHz and 5680 kHz). Signal radiation in these frequency ranges have the important property of being reflected by the ionosphere. The ionosphere is a layer of electrically charged particles at the top of the earth’s atmosphere. The layer is caused by the strong solar radiation entering the upper atmosphere. When a radio wave in the MF or HF range hits this layer, it is reflected back to earth. Multiple reflections between this layer and earth are are possible, allowing great distances to be obtained in these ranges, particularly the high-frequency band. The disadvantage of this type of propagation is that it depends on the characteristics of the ionosphere, which varies widely, especially during daylight hours. As a result of this varying, the waves are reflected differently and take different paths over a period of time. This causes the signal at the receiver to vary in strength, which causes the output to fade in and out. VHF and UHF Band Communications Signal radiation in these frequency ranges get very little ionospheric reflection. As a result, communi- cations in these ranges tend to be line-of-sight and over a short distance. Line-of-sight means exactly what the name says–the transmitter and receiver must be within a straight visual sighting line from each other. Buildings and uneven terrain may affect the transmission. The lower part of the UHF band and the VHF band is also used for mobile communications and television. 1-2



Aviation News
AGI Software Enhances Air Force AMC Tech for Humanitarian Relief
GLADS software solution. Photo: Analytical Graphics, Inc. [Avionics Today 11-21-2014]...
aviationtoday.com
Delta orders 50 Airbus widebody aircraft
25 A350-900 and 25 A330-900neo to join fleet of leading...
airbus.com
Airbus and UNESCO partner on global student challenge Fly Your Ideas
Empowering a new generation of young innovators Share this Read...
airbus.com
Airbus announces distinguished evaluation Jury for the 2nd GEDC Airbus Diversity Award
Leading Aircraft manufacturer, Airbus, announces the members of the prestigious...
airbus.com
Northrop Grumman New Open-Architecture DIRCM Laser Protects Crew and Cargo
Northrop Grumman offices. Photo: Northrop Grumman [Avionics Today 11-20-2014] Northrop...
aviationtoday.com
North Texas NextGen Procedures Deliver Benefits
NextGen project in North Texas to deliver more on-time flights,...
faa.gov
Eurocontrol and EDA Collaborate to Provide SESAR Military Perspective
[Avionics Today 11-19-2014] Eurocontrol and the European Defence Agency (EDA)...
aviationtoday.com
Innovative by nature: Airbus establishes a company-wide network for bionics projects
Airbus believes that much can be learned by studying the...
airbus.com
NTSB Rules Favorably on FAA UAS Appeal
November 18The National Transportation Safety Board today affirmed the FAAs...
faa.gov
Northrop Grumman Awarded $210 Million to Supply Joint STARS to US Air Force
Technicians demonstrating the Joint STARS system. Photo: Northrop Grumman [Avionics...
aviationtoday.com
BAE Systems Submits Proposal to Protect US Troops Against Infrared Threats
The Common Infrared Countermeasure (CIRCM) system. Photo: BAE Systems [Avionics...
aviationtoday.com
Airbus to expand oversize air transport capability
Launches development of new Beluga oversize transport aircraft Share this...
airbus.com
The A350 XWB embarks on demonstration tour of Asia
MSN5 takes off to South Korea, Japan, Vietnam, Thailand and...
airbus.com
Elbit to Provide Air Defense Systems for Diehl Defence Airbus A400
The J-MUSIC system. Photo: Elbit [Avionics Today 11-17-2014] Elbit Systems...
aviationtoday.com
Northrop Grumman to Supply H-1 Mission Computer
The Naval Air Systems Command (NAVAIR) has awarded a contract...
aviationtoday.com
Airbus-supported SESAR demonstration activities are guiding the way towards improved air traffic management
Ongoing demonstrations as part of the Single European Sky ATM...
airbus.com
Latin American and Caribbean airlines will need 2,300 aircraft by 2033
Intra-regional traffic to be Latin America’s greatest potential Share this...
airbus.com
Honeywell Engines to Power Textron AirLand’s Scorpion Aircraft
Textron AirLand Scorpion demonstration flight at the 2014 Royal International...
aviationtoday.com
MD Helicopters Signs Support Contract for Saudi Arabian National Guard
The Saudi Arabian National Guard has issued a $976,222 to...
aviationtoday.com
NAVAIR Electromagnetic Aircraft Launch System to Reduce Aircraft ‘Wear-and-Tear’
EMALS air launch system. Photo: General Atomics [Avionics Today 11-14-2014]...
aviationtoday.com


Privacy Statement - Copyright Information. - Contact Us

comments powered by Disqus

Integrated Publishing, Inc.
9438 US Hwy 19N #311 Port Richey, FL 34668

Phone For Parts Inquiries: (727) 755-3260
Google +