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@ -10,6 +10,8 @@
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<center><img src="amps.jpg"/></center>
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<center><h1>*this doc is under construction*</h1></center>
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<ul>
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<li><a href="#history">History</a>
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<li><a href="#howitworks">How it works</a>
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@ -24,6 +26,7 @@ History
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<p>
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*TBD*
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The Advanced Mobile Phone Service (AMPS) was an analog cellular mobile phone system developed by Bell Labs.
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From 1968 to 1983 the Bell Labs worked out the system, while Motorola was developing the cellular phone.
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Dr. Martin Cooper produced the first handheld phone "DynaTAC8000x", the famous Brick Phone.
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@ -55,8 +55,6 @@ 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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<center><h1>*this doc is under construction*</h1></center>
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<center>
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<ul>
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<li><a href="setup.html">Radio setup</a></li>
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@ -40,7 +40,7 @@ This image shows a two-band amateur radio receiver without limitations for the f
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<p>
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I built several transmitters out of modified taxi radios.
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It features a simple digital PLL (configurable by jumpers) and allows to directly connect the audio signal to the oscillator.
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This is highly recommended for the C-Netz, because signaling is done by sifting the carrier directly.
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This is highly recommended for the C-Netz, because signaling is done by modulating (shifting) the carrier directly.
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One unit has a switch to change between A-Netz and B-Netz (2-meter version) and the other units to change between C-Netz and NMT (70-cm version).
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I added an input to switch between two channels for the B-Netz.
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(Whenever a B-Netz phone is paged, the channel must be temporarily switched to the paging channel.)
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@ -135,7 +135,7 @@ I use 10 K resistor for connecting radio output (discriminator) to microphone in
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Connect the ground of input and output to one end of the resistor. (shown in the picture as 'Masse')
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Select this side to which the slider moves, if the knob turned all the way left (or moved all the way down).
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Connect the input signal ('Signaleingang') to the other end of the resistor.
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At least connect the output signal ('Signalausgang') to the slider of the resistor.
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Finally connect the output signal ('Signalausgang') to the slider of the resistor.
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</p>
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<p>
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