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@ -76,7 +76,7 @@ The system puts the number into a queue, so that simultaneous calls can be handl
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<p>
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<p>
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A train of paging messages are transmitted without interruption.
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A train of paging messages are transmitted without interruption.
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There are two types of messages: A paging message and an idle message.
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There are two types of messages: A paging message and an idle message.
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Each message was about 8.2 seconds long, divided into a sequence of tones.
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Each message is 0.82 seconds long, divided into a sequence of tones.
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</p>
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</p>
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<p>
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<p>
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@ -94,7 +94,7 @@ This is how a paging message looks like:
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<p>
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<p>
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The digit clock is retrieved from the change of tones.
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The digit clock is retrieved from the change of tones.
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If two subsequent digits are the same, the second digit was replaced by a 'Repeat' digit, so that there is always a change of tone between digits.
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If two subsequent digits are the same, the second digit was replaced by a 'Repeat' digit, so that there is always a change of tone between digits.
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The Idle tone resets the receiver register and indicates a new message.
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The Idle tone indicates a new message and resets the receiver's register to start over receiving a message.
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A pager ID '122233' would be transmitted as 1-2-R-2-3-R.
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A pager ID '122233' would be transmitted as 1-2-R-2-3-R.
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A message is repeated multiple times, depending on the load of the system. (2-5 times ???)
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A message is repeated multiple times, depending on the load of the system. (2-5 times ???)
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If there is no message to be transmitted, the following idle message is sent.
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If there is no message to be transmitted, the following idle message is sent.
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@ -116,7 +116,7 @@ This is how an idle message looks like:
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<p>
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<p>
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Here is a list of all frequencies used.
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Here is a list of all frequencies used.
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The distance between frequencies increases on higher frequencies, allowing simple RC filters to be used to detect the tones.
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The distances between frequencies increase on higher frequencies (proportional to the frequency), allowing simple RC filters to be used to detect the tones.
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</p>
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</p>
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<pre class="list">
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<pre class="list">
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@ -176,7 +176,8 @@ Base station for channel B ready, please tune transmitter and/or receiver to 87.
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</pre>
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</pre>
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<p>
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<p>
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If you don't have a FM transmitter instead of an AM transmitter, tune it 7.5 KHz below or above the indicated channel.
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If you have an FM transmitter instead of an AM transmitter, tune it 7.5 KHz below or above the indicated channel.
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Use narrow band deviation up to 5 kHz without pre-emphasis, if possible.
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I suggest to use SDR, so check out the SDR page.
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I suggest to use SDR, so check out the SDR page.
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Then enter the ID of your pager. You will find it printed on the device and/or on the 18 pin chip inside.
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Then enter the ID of your pager. You will find it printed on the device and/or on the 18 pin chip inside.
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If your pager's ID is 123456, enter it and press 'd' to start paging:
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If your pager's ID is 123456, enter it and press 'd' to start paging:
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@ -208,6 +209,7 @@ eurosignal.c:760 info : Call has been disconnected by network.
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<p>
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<p>
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In order to receive a paging message, use -R (--rx).
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In order to receive a paging message, use -R (--rx).
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Then the software will decode the received IDs and display them.
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Then the software will decode the received IDs and display them.
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You may also use both -R -T to allow the software to decode while it is encoding.
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</p>
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</p>
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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