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<html>  <head>    <title>RFID-Bulletin Board: Re: terminus &quot;transponder&quot;, Koos Fockens at 1/17/2001 08:20</title>	  <!-- Anfang Header --><!-- Ende Header -->  </head>  <BODY BGCOLOR="#fffcf4"><!-- Anfang BeitragsseitenKopf --><!-- Ende BeitragsseitenKopf --><!-- AnfangBanner --><!-- EndeBanner --><blockquote>    <center>      <h1>Re: terminus &quot;transponder&quot;</h1>    </center><!-- Anfang BeitragsNavigationsLeisteOben --><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><center><P><B>[ <a href="../index.htm">RFID-Bulletin Board</a> ]</B></P></center><!-- AnfangLinie --><center><p><HR></p></center><!-- EndeLinie --><!-- Ende BeitragsNavigationsLeisteOben --><p>Written by <a href="mailto:kf@nedap.nl">Koos Fockens</a> at 17 Jan 2001 08:20:26:<p>As an answer to: <a href="276.htm">Re: terminus </a> written by Koos Fockens at 16 Jan 2001 13:09:52:<p>>>Hi,>I am looking for information concerning the meaning and origin of the >word "transponder".>What is exactly meant by transmit and what by response?>Is there any connection with the read / write function of a transponder?>I am looking forward to receiving your responses!...?>Stefan>The term 'transponder' is coming from the radar and radio navigation technology. >Applications there are for example:>1. secondary radar, wherein a receiver in the airplane receive an interrogating pulse>from a ground based radar, and retransmits a (coded) pulse, which is received at >ground.>The unit in the airplane is called the transponder.>2. TACAN (TACtical Air Navigation, MIL) and DME (Distance Measurement Equipment, civil) runs in the >opposite way: a transmitter in the airplane transmit a ( coded) pulse, which is >received at the <br>ground beacon station. This retransmit this pulse back to the >airplane. The timedelay is measured in the airplane unit and gives the distance >to the ground beacon.>Both systems work in the frequency band 960 - 1215 MHz. <p>ADDITION:<br>At NEDAP we make a difference between the name "Transponder" and "Responder".<br>The passive type tags, which modulate an interrogating carrier by load modulation, we call <br>a "Responder". Because this device does not contain an own oscillation transmitter circuit.<br>Tags which does generate a signal of its own, after being triggered by an interrogating pulse, <br>we call a transponder. <br>Example of this are the TIRIS tags, and the fish imlanted tags of our NEDAP TRAIL
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