Ringer

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With the term ringer or Auftastton is called an in-band signaling for triggering control functions (in the sense of remote control or remote operation ) which, when FM - voice systems is in use.

For this purpose, the transmission signal is briefly modulated with a certain tone or certain tone combinations instead of the voice signal to trigger remote control functions. At the receiver there is an evaluation circuit that triggers the appropriate control functions when these frequencies occur.

In the Federal Republic of Germany in particular, two different frequencies are used as the tone call frequency for BOS radio services and in some cases also for commercial radio applications: tone call I corresponds to a sine tone of 1750 Hz, tone call II 2135 Hz.

There is also the rarely used tone III with a sine tone of 2800 Hz - this is provided in the technical guidelines of the authorities and organizations with safety tasks for relay radio stations (TR relay radio station devices) with the note "if required for special circuits" and is not after any to find the construction guidelines for radio devices of the BOS manufactured mobile or handheld radio.

In Germany amateur radio usually only used tone I to activate relay stations . Other signaling systems such as CTCSS or Digital Coded Squelch (DCS) are now also used. In the meantime it is also possible to open some relays by means of multi-frequency dialing (DTMF). A permanent transmission of these relay stations is usually not permitted, so the transmitter of the relay station must be switched on before the radio amateurs actually transmit , which is colloquially referred to as opening or keying . A so-called touch tone is sent with a frequency of 1750 Hz, which causes the control logic of the relay station to activate the transmitter and usually also to send an identifier (e.g. your own call sign in Morse code). The ringer serves primarily to prevent unwanted activation of a relay due to radio interference .

Individual evidence

  1. ↑ Participant booklet radio operator course , fire brigade and disaster control school Rhineland-Palatinate, December 2009 ( PDF file; 2.54 MB)
  2. ↑ Technical guideline of the authorities and organizations with security tasks (TR-BOS) for relay radio stations (TR relay radio stations) , published by the Subcommittee on Management and Operational Equipment (UA FEM) of Working Group II "Internal Security" of the Working Group of the Interior Ministries of the Länder and the committee for Information and Communication (AIuK) of Working Group V "Fire Brigade Matters, Rescue, Disaster Control, Civil Defense" of the Working Group of the Interior Ministries of the Länder, status: October 1994 ( PDF file)
  3. ↑ Hessenrundspruch 33/09 ( Memento from November 26, 2013 in the Internet Archive ), of the German Amateur Radio Club (DARC), November 11, 2009, page 3 (PDF file; 87.1 KB)
  4. ↑ Eckart Moltrecht: Amateur radio course, operating technology and regulations for the amateur radio certificate class 3 . 4th edition. Verlag für Technik und Handwerk, Baden-Baden 2004, ISBN 3-88180-364-5 , Lesson 23: The amateur radio traffic, p. 162 ( Lesson 7: Operations on VHF / UHF [accessed January 17, 2011]).