science

Standard frequency and time signal service

Standard frequency and time signal service is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Standard frequency and time signal service rather than just read about it. In short: Standard frequency and time signal service (short: SFTS) is, according to Article 1.53 of the International Telecommunication Union's (ITU) Radio Regulations (RR), "A radiocommunication service for scientific, technical and other purposes, providing the transmission of specified frequencies, time signals, or both, of stated high precision, intended for general reception". Classification In accordance with ITU Radio…

Key takeaways

Standard frequency and time signal service belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Standard frequency and time signal service to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Standard frequency and time signal service from memory before moving on to harder problems.

Reference excerpt

Standard frequency and time signal service (short: SFTS) is, according to Article 1.53 of the International Telecommunication Union's (ITU) Radio Regulations (RR), "A radiocommunication service for scientific, technical and other purposes, providing the transmission of specified frequencies, time signals, or both, of stated high precision, intended for general reception".

Classification In accordance with ITU Radio Regulations (article 1) variations of this radiocommunication service are classified as follows: Standard frequency and time signal service (article 1.53)

Standard frequency and time signal-satellite service In general this radiocommunication service uses radio stations as follows:

Standard frequency and time signal stations (article 1.95)

Standard frequency and time signal-satellite service

Standard frequency and time signal-satellite service (short: SFTSS) is, according to Article 1.54 of the International Telecommunication Union's (ITU) Radio Regulations (RR), defined as A radiocommunication service using space stations on earth satellites for the same purposes as those of the standard frequency and time signal service. An example to this were experiments of time synchronisation (Global Transmission Services GTS-2) onboard International Space Station. However, in accordance to the ubiquitous availability, GNSS-satellite signals will be used in practice (see also: GPS disciplined oscillator).

Frequency allocation The allocation of radio frequencies is provided according to Article 5 of the ITU Radio Regulations (edition 2012). In order to improve harmonisation in spectrum utilisation, the majority of service-allocations stipulated in this document were incorporated in national Tables of Frequency Allocations and Utilisations which is with-in the responsibility of the appropriate national administration. The allocation might be primary, secondary, exclusive, and shared.

primary allocation: is indicated by writing in capital letters (see example below) secondary allocation: is indicated by small letters Example of frequency allocation

Time signals in use The following are the known HF time signal stations currently operational.

United States The Standard Time and Frequency Signal (STFS) is a Radiocommunication service providing the transmission of specified frequency and time signal, of stated high precision, intended for general reception in the United States and beyond. The radio signals are broadcast on very precise carrier frequencies by the U.S. Naval Observatory and the National Institute of Standards and Technology (NIST), formerly the National Bureau of Standards (NBS). The technical specification of that particular service is in line to the provisions of the International Telecommunication Union's (ITU) Radio Regulations (RR)

See also Time synchronization in North America Radio Clock Time_signal#Radio_time_sources

References

External links NIST Time and Frequency Division NPL India Time and Frequency StandardsBad Link

Illustrations

Worked examples

Example 1 — a first encounter with Standard frequency and time signal service

Start with the simplest possible case. Write down what Standard frequency and time signal service claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Standard frequency and time signal service before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Standard frequency and time signal service ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Standard frequency and time signal service

In research: Standard frequency and time signal service appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Standard frequency and time signal service in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Standard frequency and time signal service is common in secondary-school and first-year university syllabi. It links to neighbouring topics Radiocommunication services ITU, Standards, Time signals, so understanding it makes those chapters shorter.
In everyday life: Look for Standard frequency and time signal service outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Standard frequency and time signal service in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Standard frequency and time signal service means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Standard frequency and time signal service out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Standard frequency and time signal service in simple terms?

Why does Standard frequency and time signal service matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Standard frequency and time signal service?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Standard frequency and time signal service.