From 0cfcf671572f512f4d0a0d13d149b0b293d366f7 Mon Sep 17 00:00:00 2001 From: Andreas Eversberg Date: Sat, 11 Jan 2020 17:59:51 +0100 Subject: [PATCH] Work on docs --- docs/eurosignal.html | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/docs/eurosignal.html b/docs/eurosignal.html index 59c2b68..081efe9 100644 --- a/docs/eurosignal.html +++ b/docs/eurosignal.html @@ -76,7 +76,7 @@ The system puts the number into a queue, so that simultaneous calls can be handl

A train of paging messages are transmitted without interruption. There are two types of messages: A paging message and an idle message. -Each message was about 8.2 seconds long, divided into a sequence of tones. +Each message is 0.82 seconds long, divided into a sequence of tones.

@@ -94,7 +94,7 @@ This is how a paging message looks like:

The digit clock is retrieved from the change of tones. 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. -The Idle tone resets the receiver register and indicates a new message. +The Idle tone indicates a new message and resets the receiver's register to start over receiving a message. A pager ID '122233' would be transmitted as 1-2-R-2-3-R. A message is repeated multiple times, depending on the load of the system. (2-5 times ???) If there is no message to be transmitted, the following idle message is sent. @@ -116,7 +116,7 @@ This is how an idle message looks like:

Here is a list of all frequencies used. -The distance between frequencies increases on higher frequencies, allowing simple RC filters to be used to detect the tones. +The distances between frequencies increase on higher frequencies (proportional to the frequency), allowing simple RC filters to be used to detect the tones. 

@@ -176,7 +176,8 @@ Base station for channel B ready, please tune transmitter and/or receiver to 87.

-If you don't have a FM transmitter instead of an AM transmitter, tune it 7.5 KHz below or above the indicated channel. +If you have an FM transmitter instead of an AM transmitter, tune it 7.5 KHz below or above the indicated channel. +Use narrow band deviation up to 5 kHz without pre-emphasis, if possible. I suggest to use SDR, so check out the SDR page. Then enter the ID of your pager. You will find it printed on the device and/or on the 18 pin chip inside. If your pager's ID is 123456, enter it and press 'd' to start paging: @@ -208,6 +209,7 @@ eurosignal.c:760 info : Call has been disconnected by network.

In order to receive a paging message, use -R (--rx). Then the software will decode the received IDs and display them. +You may also use both -R -T to allow the software to decode while it is encoding.

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