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This commit is contained in:
Andreas Eversberg
2017-12-05 20:36:11 +01:00
parent 1ef1b93776
commit 3ab5a3f6a9
5 changed files with 17 additions and 13 deletions
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2
docs/a-netz.html
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@@ -23,7 +23,7 @@ History
<p>
A-Netz was the first mobile telephone network in Germany.
It existed between 1985 and 1977.
It existed between 1958 and 1977.
The first mobile units were huge and heavy and consisted of radio tubes.
Only big cars could carry these units in their trunk.
It used full duplex radio link.

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docs/b-netz.html
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@@ -58,7 +58,8 @@ This helped to lower the channel allocation time.
<center><img src="bird.png"/></center>
<center><a href="bnetz.wav">Listen to base station's idle sequence</a></center>
<center>Listen to base station's idle sequence:<br>
<audio src="bnetz.wav" controls></audio></center>
<p class="toppic">
<a name="howitworks"></a>
@@ -137,7 +138,6 @@ All digit starts with sync pattern ("0 1 1 1 0").
|0 1 1 1 0|0 0 1 1 0|0|0 1 1 0 0| Wahlziffer 7
|0 1 1 1 0|0 0 1 0 1|0|1 0 1 0 0| Wahlziffer 8
|0 1 1 1 0|0 0 0 1 1|0|1 1 0 0 0| Wahlziffer 9
|0 1 1 1 0|0 0 0 1 1|0|0 1 0 0 1| Wahlziffer 2
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Sync

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docs/index.html
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@@ -36,7 +36,7 @@
</tr>
<tr>
<th>AMPS (USA) / TACS (UK / Ireland / Italy)</th>
<th>my ealy radio setup</th>
<th>my early radio setup</th>
</tr>
</table>
</center>

12
docs/sdr.html
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@@ -145,11 +145,11 @@ Multiple Channels
<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.
One nice feature of 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 spectrum.
I suggest to have at least one channel space between channels you want to generate.
I suggest to use channel 1 and 3 or even channel 1 and 4 for NMT system.
The software will notice you, if the channels wont fit into the bandwidth.
The software will notice you, if the channels wont fit into the spectrum.
In this case increase the sample rate (-s) to generate a wider spectrum. (--sdr-samplerate must not need to be changed)
</p>
@@ -161,7 +161,7 @@ I suggest to stay below 60% for each threads.
</p>
<p>
Example: C-Netz<br>
<b>Example: C-Netz</b><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).
@@ -180,8 +180,8 @@ Because C-Netz uses only odd channel numbers for 10 KHz spacing, we use channel
</pre>
<p>
Example: Test TV signal<br>
Give PAL 'FUBK' test image on TV channel 21.
<b>Example: Test TV signal</b><br>
Transmit PAL 'FUBK' test image on TV channel 21.
</p>
<pre>