work on docs

docs/index.html

@@ -74,9 +74,9 @@ Implemented networks:
 	<li><a href="a-netz.html">A-Netz</a> (Germany)</li>
 	<li><a href="b-netz.html">B-Netz</a> (Germany) ATF-1 (Netherlands)</li>
 	<li><a href="c-netz.html">C-Netz</a> (Germany)</li>
-	<li><a href="nmt.html">NMT - Nordic Mobile Telephone</a> (Scandinavia)</li>
+	<li><a href="nmt.html">NMT 450 / 900 - Nordic Mobile Telephone</a> (Scandinavia)</li>
 	<li><a href="amps.html">AMPS - Advanced Mobile Phone Service</a> (USA)</li>
-	<li><a href="tacs.html">TACS - Total Access Communication System</a> (UK/Italy)</li>
+	<li><a href="tacs.html">TACS / JTACS - Total Access Communication System</a> (UK/Italy/Japan)</li>
 	<li><a href="radiocom2000.html">Radiocom 2000</a> (France)</li>
 </ul>
 </center>

docs/nmt.html

@@ -560,6 +560,20 @@ FI,1    FI,9    81..89  1-399           Finland (Telecom Finland)
 
 </pre>
 
+<pre>
+
+# nmt -N 900 -Y list
+TA from TA to   YY Code Channels        Short   Country (Provider)
+--------------------------------------------------------------------------------
+DK,1    DK,9    11..19  1-2023          Denmark (Tele Danmark Mobile)
+SE,1    SE,9    21..29  1-2023          Sweden (Telia Mobitel)
+NO,1    NO,9    31..39  1-2023          Norway (Telenor Mobil)
+FI,1    FI,9    41..49  1-2023          Finland (Telecom Finland)
+...
+
+</pre>
+
+
 <p>
 In this example we select 'Sweden'.
 You must set you phone to network 'Sweden' or 'SE'.

docs/sdr.html

@@ -146,6 +146,7 @@ Multiple Channels
 </p>
 
 <p>
+Multiple channels can be useful, to keep the control channel, while establishing one or even multiple voice channels.
 One nice things about SDR is that a spectrum is transmitted and not just one modulated carrier.
 Because the carrier is actually generated in software, we can generate multiple carriers that fit in our bandwidth.
 I suggest to have at least one channel space between channels you want to generate.
@@ -158,9 +159,46 @@ In this case increase the sample rate (-s) to generate a wider spectrum. (--sdr-
 Note that the CPU usage increases for the main thread.
 I suggest to monitor the usage using "top -H".
 You will see each thread. Be sure not to get too close to 100 percent.
-I suggest to stay below 50%, at least for all threads.
+I suggest to stay below 60% for each threads.
 </p>
 
+<p>
+Example: C-Netz<br>
+Two channes are created, one the OgK (control channel) and one SpK (speech channel).
+The distance between channels is 20 KHz (two channels).
+Because C-Netz uses only odd channel numbers for 10 KHz spacing, we use channel 131 (OgK) and 135 (SpK).
+</p>
+
+<pre>
+
+# cnetz --sdr-soapy \
+        --sdr-rx-gain 50 \
+	--sdr-tx-gain 30 \
+        --sdr-bandwidth 5000000 \
+        --sdr-samplerate 5000000 \
+        --sdr-tune-args "OFFSET=1000000" \
+	-s 100000 \
+	-k 131 -k 135 \
+	-C 0,0
+
+</pre>
+
+<p>
+Example: Test TV signal<br>
+Give PAL 'FUBK' test image on TV channel 21.
+</p>
+
+<pre>
+
+# osmotv --sdr-soapy \
+         --sdr-tx-gain 60 \
+	 --sdr-tune-args "OFFSET=-3000000" \
+	 -r 13750000  \
+	 -c 21  \
+	 tx-fubk
+
+</pre>
+
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 </td></tr></table></center>
 </body>

docs/tacs.html

@@ -31,7 +31,7 @@ Total Access Communication System (TACS) and ETACS are mostly-obsolete variants
 </ul>
 
 <p>
-TACS is the UK version of the AMPS.
+(J)TACS is the UK and Japanese version of the AMPS.
 There are three major differences:
 </p>
 
@@ -42,7 +42,7 @@ There are three major differences:
 </ul>
 
 <p>
-Refer to <a href="amps.html">AMPS</a> documentation, but use executable 'tacs' instead of 'amps'.
+Refer to <a href="amps.html">AMPS</a> documentation, but use executable 'tacs' or 'jtacs' instead of 'amps'.
 </p>
 
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