General usage

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SvxLink Server user documentation

Here we’ll describe, how to use the SvxLink Server via the radio interface. SvxLink is controlled by DTMF (Dual Tone Multi Frequency) signalling. All commands to the system end with the pound sign (#). You may think of it like the enter key on a computer. However, the sysop has the option to configure the system to execute commands on squelch close so that the pound sign may not be needed.

This means that other SVXLINK systems can act differently.

There is also, an “anti-flutter” mode of operation. This mode of operation makes DTMF detection perform well when the signal is weak or there is mobile flutter present. This mode is activated on a per command basis. To activate, start each command with an “A” (think: Activate Anti-flutter). Enter the digits, replacing duplicate digits with a “B” (11=1B, 111=1B1, 1111=1B1B etc). End with a “C” (think: Conclude). Some examples below.

This mode applies only, if the internal DTMF decoder is used.

AC Empty command. Same as just pressing #.
A1C Command executed: 1
A12B3C Command executed: 1223
A12B23C Command executed: 12223

So, what does it mean? Well, this way of coding commands will allow digits to be “double detected” without affecting the end result, which can happen if there is mobile flutter present on the received signal. Consider the examples below.

ACCC
Empty command. Same as just pressing #.
A111C
Command executed: 1
A11122BB3CC
Command executed: 1223
AA12B2233C
Command executed: 12223

Exactly the same result as the first example, even though some digits were detected multiple times.

There is a command timeout of 10 seconds. If no DTMF characters has been received for 10 seconds, the reception buffer will be cleared.

The star key (*) is special. It triggers the node to identify itself. However, identification is only performed if the star is entered as the only DTMF character. If digits are received, before or after, it will be considered to be part of a command. A command prefixed with a star (*) will be executed in the idle context even if a module is activated. So, even if for example ModuleEchoLink is activated you can still check if you have any voice mails by sending something like *3123#.

The “D” key is used to activate a pre programmed macro or short cut. A macro is used to reduce the number of DTMF codes that have to be sent. For example if the macro 5 has been defined to connect to the *ECHOTEST* node only D5# has to be pressed instead of 2#9999#. It is the node sysop that defines the macros. Check with your local node sysop what macros are setup. If you connect to an EchoLink node very it can be easier for the user, to setup a macro for it. Ask your sysop to do that.

The system is built up of a core system that handles the transceiver interface. The core system can then be extended by loading modules that handles a specific voice service. Each module has a unique ID number associated with it. The association is done during the configuration of the system. To activate a module, press its ID number followed by the number (#) sign. The default configuration specifies the Help module as ID zero, so start by activating that module and listen to the help messages (i.e. send 0# or A”zero”C). Go on to test the other modules. When a module is activated, send the zero# command to get help about that module. To exit a module, just send a # (or AC). Description in more detail for the different modules follow below.

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