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@ -74,7 +74,7 @@ The mobile station will only seize the channel, if the green light is on, otherw
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When the user picks up the handset, the phone switches on its transmitter on up-link channel and transmits a continuous 1750 Hz calling tone.
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The base station receives this tone and turns off its 2280 Hz idle tone.
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The mobile station detects the tone is missing and turns off its 1750 calling tone.
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The the speech path is connected through to an operator.
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The base station detects the tone is missing and the speech path is connected through to an operator.
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The operator asks for the mobile station number and the number to dial and places the call.
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</p>
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@ -170,7 +170,7 @@ There is no ring-back indication from the mobile station to the base station.
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When the user picks up the handset, the phone switches on its transmitter on up-link channel and transmits a continuous 1750 Hz answer tone.
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The base station receives this tone and turns off the four paging tones.
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The mobile station detects the tone is missing and turns off its 1750 answer tone.
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The the speech path is connected through to the caller (or operator).
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The base station detects the tone is missing and the speech path is connected through to the caller (or operator).
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</p>
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<center><img src="a-netz-yellow.jpg"/></center>
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@ -298,7 +298,7 @@ To automatically release the call, when the carrier signal gets lost, look at th
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It is the same principle.
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</p>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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@ -257,7 +257,7 @@ paging & voice channel.
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</pre>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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@ -628,7 +628,7 @@ The base station returns to idle.
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Level adjustment:
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We see a receive level of around 85%.
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Tune your receiver to the up-link frequency, so you get loop-back of base station broadcast.
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Use the variable resistor (connecting your transmitter) to adjust the volume until the received level matches the same level of your previously received bust.
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Use the variable resistor (connecting your transmitter) to adjust the volume until the received level matches the same level of your previously received message.
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In my case I adjust the transmitter to match around 85%. (+- 10% is good)
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Now, whatever frequency deviation the phone transmits for signaling, so does your base station.
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Use the other variable resistor (connecting your receiver) to adjust the volume until the level matches about 100%. (+- 10% is good)
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@ -799,7 +799,7 @@ I call this "JPROM" (Jumper Programmable Read Only Memory).
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<center><img src="b-netz_dioden2.jpg"/></center>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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@ -445,7 +445,7 @@ Level adjustment:
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We see a receive level of around 96%.
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This is already good, since I did the adjustment previously.
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Tune your receiver to the up-link frequency, so you get loop-back of base station broadcast.
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Use the variable resistor (connecting your transmitter) to adjust the volume until the received level matches the same level of your previously received bust.
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Use the variable resistor (connecting your transmitter) to adjust the volume until the received level matches the same level of your previously received message.
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In my case I adjust the transmitter to match around 96%. (+- 10% is good)
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Now, whatever frequency deviation the phone transmits for signaling, so does your base station.
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Use the other variable resistor (connecting your receiver) to adjust the volume until the level matches about 100%. (+- 10% is good)
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@ -607,7 +607,7 @@ telegramm.c:1525 notice : Received Telegramm that is not used OgK channel signal
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</pre>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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@ -91,7 +91,7 @@ Finally store the settings using "alsactl store" command.
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Do this whenever you want to keep your adjustments.
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</p>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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@ -13,12 +13,32 @@
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<br><br>
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<center>
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<img src="a-netz_small.jpg" title="A-Netz"/><img src="b-netz_small.jpg" title="B-Netz"/><br>
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A-Netz phone in a Merceds Benz ; B-Netz cell tower in Bredstedt<br>
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<img src="c-netz_small.jpg" title="C-Netz"/><img src="nmt_small.jpg" title="Nordisk Mobil Telefon"/><br>
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my mother's C-Netz SIM card ; countries that developed NMT (Nordic Mobile Phone)<br>
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<img src="amps_small.jpg" title="Advanced Mobile Phone Service"/><img src="setup_small.jpg"/><br>
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AMPS (Advanced Mobile Phone Service) ; my radio setup<br>
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<table border="0">
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<tr>
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<td><img src="a-netz_small.jpg" title="A-Netz"/></td>
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<td><img src="b-netz_small.jpg" title="B-Netz"/></td>
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</tr>
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<tr>
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<th>A-Netz phone in a Merceds Benz</th>
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<th>B-Netz radio tower in Bredstedt</th>
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</tr>
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<tr>
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<td><img src="c-netz_small.jpg" title="C-Netz"/></td>
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<td><img src="nmt_small.jpg" title="Nordisk Mobil Telefon"/></td>
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</tr>
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<tr>
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<th>my mother's C-Netz SIM card</th>
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<th>NMT (Nordic Mobile Telephone)</th>
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</tr>
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<tr>
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<td><img src="amps_small.jpg" title="Advanced Mobile Phone Service"/></td>
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<td><img src="setup_small.jpg"/></td>
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</tr>
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<tr>
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<th>AMPS (Advanced Mobile Phone Service)</th>
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<th>my radio setup</th>
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</tr>
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</table>
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</center>
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<br><br>
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@ -35,7 +55,7 @@ This project is pure software that requires a transmitter and a receiver connect
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A second sound card or ISDN card is used to route calls from and to the mobile phone.
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</p>
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<h1>*this doc is under construction*</h1>
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<center><h1>*this doc is under construction*</h1></center>
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<center>
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<ul>
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@ -62,7 +62,7 @@ To call phone, switch transmitter using pilot tone to 153.370 MHz
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Do you hear the whistling sound on your speaker/headset? Now you can continue with the radio setup.
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</p>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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@ -970,7 +970,7 @@ The SMS, which was encoded by the SMS layer, is delivered using DMS frames.
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After sending all DMS frames, the call is released toward the mobile station.
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</p>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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@ -86,8 +86,9 @@ This is highly recommended for the C-Netz, because signaling is done by sifting
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<p>
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In order to keep RF emission low, use a dummy load for lab test.
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Use two separated antennas for outside use of the mobile phone.
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Connect one dummy load to the transmitter and another one to the mobile phone's antenna connector.
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Alternatively use two separated antennas for outdoor use of the receiver and transmitter, to avoid using a duplexer unit.
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Also use antanna on the mobile phone to move further away from the base station.
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</p>
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<center><img src="dummyload.jpg"/></center>
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@ -161,7 +162,7 @@ If your phone has built in antenna and cannot be connected to a dummy load (C-Ne
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<center><img src="b-netz-display.jpg"/></center>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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@ -277,7 +277,7 @@ It can be used to check a headset.
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Everything that is spoken into the microphone should appear on the headphone.
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</p>
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[<a href="index.html">Back to main page</a>]
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</body>
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</html>
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