Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Transponder shopping experience:
1. Compare - without doubt the biggest advantage that the Transponder offers shoppers today is the ability to compare thousands of Transponder at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Transponder? Wrong! If the Transponder is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Transponder then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Transponder? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Transponder and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Transponder wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Transponder then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Transponder site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Transponder, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Transponder, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
toll transponderIn telecommunication, the term
transponder (short-for
Transmitter-res
ponder and sometimes abbreviated to XPDR, XPNDR or TPDR) has the following meanings:
Satellite communications
A
communications satellite’s channel (communications) are called transponders, because each is a separate
transceiver or repeater. With digital video data compression and
multiplexing, several video and
sound reproduction channels may travel through a single transponder on a single wideband
carrier wave. Original analog (signal) 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 (communications) 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. 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 air traffic control in busy areas and allow automatic collision avoidance. Mode S tranponders 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 ships radar screen.
Road
The E-ZPass system in the eastern United States is one of many systems for paying bridge and road tolls by a RFID transponder in the car.
Motorsport
Transponders are used in motorsport for lap timing purposes. A cable loop is dug into the race circuit near to the start/finish line. Each car has an active transponder with a unique id code. When the racing car passes the start/finish line the lap time and the racing position is shown on the score board.
Underwater
Sonar transponders operate under water and are used to measure distance and form the basis of underwater location marking, position tracking and
navigation.
See also
- Racon
- Transceiver
- Secondary surveillance radar (Identification friend or foe)
- Transponding with DCC - Transponding in model railroading.
- RFID - low-cost transponder tags for asset tracking and telemetry.
Source: partly from Federal Standard 1037C and from MIL-STD-188 and from the Department of Defense Dictionary of Military and Associated Terms
toll transponderIn
telecommunication, the term
transponder (short-for
Transmitter-res
ponder and sometimes abbreviated to XPDR, XPNDR or TPDR) has the following meanings:
Satellite communications
A communications satellite’s channel (communications) are called transponders, because each is a separate transceiver or repeater. With digital video data compression and
multiplexing, several video and
sound reproduction channels may travel through a single transponder on a single
wideband carrier wave. Original analog (signal) 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 (communications) 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. 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 air traffic control in busy areas and allow automatic collision avoidance. Mode S tranponders 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 ships radar screen.
Road
The E-ZPass system in the eastern United States is one of many systems for paying bridge and road tolls by a RFID transponder in the car.
Motorsport
Transponders are used in motorsport for lap timing purposes. A cable loop is dug into the race circuit near to the start/finish line. Each car has an active transponder with a unique id code. When the racing car passes the start/finish line the lap time and the racing position is shown on the score board.
Underwater
Sonar transponders operate under water and are used to measure distance and form the basis of underwater location marking, position tracking and
navigation.
See also
Source: partly from Federal Standard 1037C and from MIL-STD-188 and from the Department of Defense Dictionary of Military and Associated Terms
Transponder - Wikipedia, the free encyclopedia
In telecommunication, the term transponder (short-for Trans mitter-res ponder and sometimes abbreviated to XPDR, XPNDR, TPDR or TP) has the following meanings:
Transponder (aviation) - Wikipedia, the free encyclopedia
A transponder is an electronic device that produces a response when it receives a radio-frequency interrogation. In aviation, aircraft have transponders to assist in identifying ...
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TRADE IN POST Car Transponder keys
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