Transponder Dme
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Transponder Dme

Understanding one of the most wonderful branch of electronics:
One of the most wonderful and interesting branch of electronics is AVIONICS. Avionics stands for AVI-ation electr-ONICS. The on-board electronics used for piloting the aircraft is called Avionics. Avionics include communication & navigation systems, autopilots & electronic Flight Management System (FMS) etc. These systems use embedded computers within them. Earlier Radio telephone systems & valves were replaced by transistor-radio systems. Different navigation systems were developed along with the time such as NDB (Non-Directional radio Beacon) which are still being used in the airports due to their lower cost.VHF Omni Range is immune to interference and thunderstorms and provides improved accuracy & is still the backbone of air navigation systems. Instrument Landing System (ILS) is a set of components used to navigate to the landing end of the run-way. Transponder is the transceiver that receives ‘interrogations'from air traffic control radar & replies with a digital code. This secondary radar reply permits the radar system to detect the aircraft more reliably and at greater distances than are possible with primary radar. This systems of secondary radars and transponders is collectively known as Air Traffic Control Radar Beacon Systems (ATCRBS).Distance Measurement Equipment(DME) is used to inform the pilot of his/her aircraft's distance away from the VOR station, thus with a bearing and distance from particular known VOR station a pilot can fix his/her exact position. LORAN systems provide navigational guidance over large areas, were popular particularly for general aviation use. Avionics have changed significantly after the advent of GPS receivers & ‘glass cockpit display systems. The use of GPS has changed aircraft navigation both in the en-route phase & approach phases of the flight. Advances in computing power & LCD panel display made ‘glass cockpit' possible.
Thus Avionics system is including very much wide coverage of electronics field and still the inventions are going on, on the same with plenty of acceleration.
About the Author
Instruments for IFR flight?
Hi, what instruments are required to fly IFR in a single engine aircraft??? like transponder, 1 or 2 radios, GPS, VOR-DME, ADF, exactly what are???
Precision is important for pilots, so first, let's get your terminology straight regarding "instruments":
"Flight Instruments" are used for controlling the aircaft without any external references. i.e. attitude indicator, altimeter, airspeed indicator, directional gyro, VSI, Turn Coordinator, etc. These may also be depicted on an electronic flight display.
Communication Radios are used for communicating with ATC, especially in an IFR environment. They can include VHF, HF, or LMF transceivers, (HF and LMF are now rare) , and a transponders with altitude reporting csapability,or ADS-B equipment. Comm Radios are not technically considered to be "instruments", however.
Navigation Radios can include the VOR receiver, ADF receiver, DME, glideslope receiver, marker beacon receiver, INS, RNAV, GPS receiver, etc. INS and RNAV equipment is rare in light GA aircraft. The Nav Radios are also not considered to be "instruments", although some of their indicators fall under the category of "instrumentation".
So, now that you are informed about correct terminology, the navigation and communication equipment required depends upon the airspace you plan fly in, and the enroute and terminal navigation facilities you intend to use. All of this can be looked up in the regulations here: http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?c=ecfr&rgn=div5&view=text&node=14:2.0.1.3.10&idno=14
The standard for a light aircraft is two Com radios, two VOR receivers (one with localizer and glideslope capability), a marker beacon recveiver, and a Mode C transponder. "Extras" in nav radios and instruments include DME, GPS, ADF, RMI, HSI and Radar Altimeter.
For what it's worth, I've flown legal IFR with basic flight instruments, a single com radio, a single VOR and not even a transponder.
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