
- An automatic device that receives, amplifies, and retransmits a signal on a different frequency (see also broadcast translator).
- An automatic device that transmits a predetermined message in response to a predefined received signal.
- A receiver-transmitter that will generate a reply signal upon proper electronic interrogation.
Welcome to CWAnswers
CWAnswers is your guide to the sprawling world wide web. The directory aims to provide a useful guide made by users. You can share your knowledge as well - simply sign up and edit your first entry. For questions just contact the team at support - at - cwanswers.com.
Weblinks for Transponder
Top 10 for Transponder
Things about Transponder you find nowhere else.
Select content modules
Ametya - a Transponder's blog
skip to main | skip to sidebar. Ametya - a Transponder's blog. Loading... Recent Comments ... This ametya - a Transponder's Weblog will carry words from other ...ametya.blogspot.com/Transponder — Blogs, Pictures, and more on WordPress
New Transponder — 3 comments ... STERILE TRANSPONDER KIT ... Satellite & Transponder — 1 comment ...en.wordpress.com/tag/transponder/Ametya - a Transponder's blog: Google Vs Googol
Feedjit Live Blog Stats. copyright © reserved to ametya - a Journathor's Weblog. This ametya - a Transponder's Weblog will carry words from other places to this ...ametya.blogspot.com/2008/03/google-vs-googol.htmlTrans_Ponder_Blog
I bought a lovely new Microphone for the Podcast ... Transponder is on line. Friday, August 17th, 2007. Hello everyone and welcome to the transponder blog. ...trans-ponder.com/transponderblog/?cat=5Transponder- CYBRA Corporation
CYBRA helps System i (AS/400 and iSeries) software vendors and programmers add bar code label, RFID tag and ... Blog. Between the Lines: the CYBRA Auto-ID Blog ...www.cybra.com/blog/tags/Transponder/
- An automatic device that receives, amplifies, and retransmits a signal on a different frequency (see also broadcast translator).
- An automatic device that transmits a predetermined message in response to a predefined received signal.
- A receiver-transmitter that will generate a reply signal upon proper electronic interrogation.
Satellite communications
A communications satellite's channels are called transponders, because each is a separate transceiver or repeater. With digital video data compression and multiplexing, several video and audio channels may travel through a single transponder on a single wideband carrier. Original analog video only has one channel per transponder, with subcarriers for audio and automatic transmission identification service ATIS. Non-multiplexed radio stations can also travel in single channel per carrier (SCPC) mode, with multiple carriers (analog or digital) per transponder. This allows each station to transmit directly to the satellite, rather than paying for a whole transponder, or using landlines to send it to an earth station for multiplexing with other stations.
Aviation
Another type of transponder occurs in identification friend or foe systems in military aviation and in air traffic control secondary surveillance radar (beacon radar) systems for general aviation and commercial aviation. Primary radar works best with large all-metal aircraft, but not so well on small, composite aircraft. Its range is also limited by terrain and rain or snow and also detects unwanted objects such as automobiles, hills and trees. Furthermore it cannot estimate the altitude of an aircraft. Secondary radar overcomes these limitations but it depends on a transponder in the aircraft to respond to interrogations from the ground station to make the plane more visible.
Depending on the type of interrogation, the transponder sends back a transponder code (or "squawk code") (Mode A) or altitude information (Mode C) to help air traffic controllers to identify the aircraft and to maintain separation. Another mode called Mode S (Mode Select) is designed to help avoiding overinterogation of the transponder (having many radars in busy areas) and to allow automatic collision avoidance. Mode S transponders are 'backwards compatible' with Modes A & C. Mode S is mandatory in controlled airspace in many countries. Some countries have also required, or are moving towards requiring, that all aircraft be equipped with Mode S, even in uncontrolled airspace. However in the field of general aviation, there have been objections to these moves, because of the cost, size, limited benefit to the users in uncontrolled airspace, and, in the case of balloons and gliders, the power requirements during long flights.
Marine
Navigational aids often have transponders called RACON designed to make them standout on a ship's radar screen.























