work on docs

docs/tacs.html

@@ -10,23 +10,9 @@
 
 <center><img src="tacs.jpg"/></center>
 
-<center><h1>*this doc is under construction*</h1></center>
-
-<ul>
-	<li><a href="#history">History</a>
-	<li><a href="#howitworks">How it works</a>
-	<li><a href="#basestation">Setup of a base station</a>
-</ul>
-
-<p class="toppic">
-<a name="history"></a>
-History
-</p>
-
 <p>
-*TBD*
-
-
+Total Access Communication System (TACS) and ETACS are mostly-obsolete variants of Advanced Mobile Phone System (AMPS) which was announced as the choice for the first two UK national cellular systems in Feb 1983.
+</p>
 
 <ul>
 	<li>Frequency range base station: 935.0125 MHz - 949.9875 MHz
@@ -43,20 +29,22 @@ History
 	<li>Mobile station transmit power: 10 or 4 Watts (vehicular) 1.6 or 0.63 Watts
 	<li>Base station transmit power: ??? (around 50 Watts)
 </ul>
+
+<p>
+TACS is the UK version of the AMPS.
+There are three major differences:
 </p>
 
+<ul>
+	<li>Different channel frequencies
+	<li>6,400 Hz signaling rate (instead of 8,000 Hz)
+	<li>Encoding of mobile station number
+</ul>
 
-<p class="toppic">
-<a name="howitworks"></a>
-How it works
+<p>
+Refer to <a href="amps.html">AMPS</a> documentation, but use executable 'tacs' instead of 'amps'.
 </p>
 
-<p class="toppic">
-<a name="basestation"></a>
-Setup of a base station
-</p>
-
-
 <hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
 </td></tr></table></center>
 </body>