Maximale Abschnittlänge mit Belegtmelder/en: Unterschied zwischen den Versionen
Uslex (Diskussion | Beiträge) Die Seite wurde neu angelegt: „The reason for this 'self-occupancy' lies in the nature of the control signals used. Both DCC and Märklin/Motorola use a positive-width encoded voltage; whenever the polarity of the signal changes, a small charging current flows briefly into the line capacitance – this current is greater the longer the connected line.“ |
Uslex (Diskussion | Beiträge) Die Seite wurde neu angelegt: „With simple occupancy detectors, the average current consumption is simply measured; therefore, an occupancy report is generated above a certain length, even without an actual consumer present.“ |
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The reason for this 'self-occupancy' lies in the nature of the control signals used. Both DCC and Märklin/Motorola use a positive-width encoded voltage; whenever the polarity of the signal changes, a small charging current flows briefly into the line capacitance – this current is greater the longer the connected line. | The reason for this 'self-occupancy' lies in the nature of the control signals used. Both DCC and Märklin/Motorola use a positive-width encoded voltage; whenever the polarity of the signal changes, a small charging current flows briefly into the line capacitance – this current is greater the longer the connected line. | ||
With simple occupancy detectors, the average current consumption is simply measured; therefore, an occupancy report is generated above a certain length, even without an actual consumer present. | |||
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Version vom 10. Dezember 2025, 14:08 Uhr
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Maximum section length
Section longer than 7 meters
Due to electrical interference, excessively long sections should not be used. Reporting sections longer than 7m are not possible (at least with Littfinski).
Monitored track sections
Quote from a message:
Isolated track sections that are to be monitored from the perspective of track occupancy detectors, have inductive and capacitive components that, depending on the length of the section, cause increasing electrical background noise. From a monitored length of several meters, this leads to a continuous occupancy indication, even if no electrical load is present on this section. This applies to all track occupancy detectors, regardless of the manufacturer. The mentioned 7m is a perfectly realistic length. . Best regards . Peter Littfinski
Are all manufacturers affected?
No, that does not apply to all manufacturers.
The reason for this 'self-occupancy' lies in the nature of the control signals used. Both DCC and Märklin/Motorola use a positive-width encoded voltage; whenever the polarity of the signal changes, a small charging current flows briefly into the line capacitance – this current is greater the longer the connected line.
With simple occupancy detectors, the average current consumption is simply measured; therefore, an occupancy report is generated above a certain length, even without an actual consumer present.
Wenn hingegen der Belegtmelder das Gleissignal auswertet, sich darauf einsynchronisiert und während des Umpolens ganz kurz 'wegsieht' (nur ein paar µs), dann wird nur ein tatsächlicher Verbrauch gemessen und Leitungs- oder Gleislängeneinflüsse sind weg.
Diese Info wurde in einem Beitrag im Forum veröffentlicht.
Weblinks
- Quelle: Forum
- -- UP4001 10:03, 28. Jan. 2012
- bearbeitet: Uslex (Diskussion) 14:37, 30. Mai 2022 (CEST), Uslex (Diskussion) 14:04, 10. Dez. 2025 (UTC)
