science

Intelsat IV F-7

Intelsat IV F-7 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 Intelsat IV F-7 rather than just read about it. In short: Intelsat IV F-7 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was seven years.

Key takeaways

Intelsat IV F-7 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Intelsat IV F-7 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Intelsat IV F-7 from memory before moving on to harder problems.

Reference excerpt

Intelsat IV F-7 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was seven years.

History The Intelsat IV F-7 was part of the Intelsat IV series which consisted of eight communications satellites, launched from Cape Canaveral during the early 1970s, marked the fifth generation of geostationary communications satellites developed by the Hughes Aircraft Company since 1963 with the launch of Syncom II, the world's first synchronous satellite. The Syncom II was 15 cm high and 28 inches in diameter, weighing 78 pounds in orbit. In contrast, the Intelsat IVs weighed more than £ 1,300 (595 kg) into orbit and were more than 17 feet (5.2 meters) in diameter. All seven satellites exceeded their projected life expectancies and were withdrawn from active duty, the last of which, the Intelsat IV F-1 was retired in October 1987. The satellite was equipped with 12 C-band transponders. It had 6,000 two-way relay phone calls or broadcast 12 concurrent color television programs or mixed combinations of communications traffic including data and fax. The satellite had 12 channels of broadband communication. Each channel had a bandwidth of 40 MHz and provided about 500 communication circuits.

Launch The satellite was successfully launched into space on August 23, 1973, at 23:57:02 UTC, by means of an Atlas-Centaur vehicle from the Cape Canaveral Air Force Station, United States. It had a launch mass of 1,414 kg.

Worked examples

Example 1 — a first encounter with Intelsat IV F-7

Start with the simplest possible case. Write down what Intelsat IV F-7 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 Intelsat IV F-7 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 Intelsat IV F-7 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 Intelsat IV F-7

In research: Intelsat IV F-7 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 Intelsat IV F-7 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: Intelsat IV F-7 is common in secondary-school and first-year university syllabi. It links to neighbouring topics American spacecraft stubs, Derelict spacecraft, Intelsat satellites, so understanding it makes those chapters shorter.
In everyday life: Look for Intelsat IV F-7 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 Intelsat IV F-7 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Intelsat IV F-7 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 Intelsat IV F-7 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Intelsat IV F-7 in simple terms?

Intelsat IV F-7 was a geostationary communication satellite built by Hughes, it was owned by Intelsat. The satellite was based on the HS-312 platform and its estimated useful life was seven years.

Why does Intelsat IV F-7 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 Intelsat IV F-7?

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 Intelsat IV F-7.