Tone sequence evaluator

from Wikipedia, the free encyclopedia

A tone sequence analyzer or tone analyzer is an electrical component in radio technology . Its task is to evaluate 5-tone sequences and to execute a circuit. Usually the coding is done with tin bridges. Newer devices have an IC that can be programmed. The advantage is that you can change the coding quickly and easily.

It is used for BOS radio ( radio alarm receivers , siren alarms) and amateur radio services ( modified radio signal receivers ).

Coding

In order to convey to the component at which tone coding it should switch, it must be coded. In this case it is done with "tin bridges", a form of jumpers which are permanently soldered . With a soldering iron , contacts are made between two conductor tracks. The systems cannot distinguish between successive identical tones, and therefore a “repeat circuit” must be provided.

Example:

12234 → 12W34 here the second two are coded as "W".
12222 → 12W2W here the second two becomes "W" and the following one is normal again and the following one is again with "W"

Special case: double tone

A double tone is required for the siren alarm , which ultimately controls the siren. It is intended for safety (5-tone tolge and double tone must be correct) and characterization of the siren tone. If the double tone changes, the siren gives its "howling" tone. Furthermore, two loops can be imitated. If you simply omit the double tone in the event of a minor alarm and the fire brigade has alarm receivers, only the silent alarm is carried out and the siren remains silent.

In digital radio , tone sequences are practically extinct. The successor variant is the POCSAG method. It works faster and offers more options (e.g. when transmitting texts).

swell