science

SCR-245

SCR-245 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 SCR-245 rather than just read about it. In short: The SCR-245 Radio was a mobile MF/HF Signal Corps Radio used by the U.S. Army before and during World War II, for short range ground communications, It was one of the first crystal controlled sets used by the Army.

Key takeaways

SCR-245 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SCR-245 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SCR-245 from memory before moving on to harder problems.

Reference excerpt

The SCR-245 Radio was a mobile MF/HF Signal Corps Radio used by the U.S. Army before and during World War II, for short range ground communications, It was one of the first crystal controlled sets used by the Army.

Use The SCR-245 was standardized on 10 June 1937, and used by Armored forces for command and control of tank units. It replaced the earlier SCR-189 and was used primarily in the early M2, M3 light tanks as well as the early M3 medium tanks. Their large size required them to be mounted in the tanks sponsons. It was replaced by the SCR-508 sets.

Components BC-223 Transmitter Modes: AM, CW. Frequency range: 4 crystal-controlled channels, 2.0 MHz to 4.5 MHz. RF Power output: 10 Watts. Range: CW 45 Miles. Voice 20 Miles. BC-312 Receiver (See BC-342) PE-55 Dynamotor (12Volt input) MP14 or MP37 mast base and 15 foot whip antenna.

Variants SCR-210 Receiver only set

See also Signal Corps Radio Crystal oscillator

References

General references TM 11-487 Electrical Communications Equipment TM 11-227 APRIL 1944 Radio Communication Equipment (Directory) TM 11-272 Radio to free Europe

External links SCR List (archived) — US Army Signal Corps Museum BC List — US Army Signal Corps Museum

Illustrations

Worked examples

Example 1 — a first encounter with SCR-245

Start with the simplest possible case. Write down what SCR-245 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 SCR-245 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 SCR-245 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 SCR-245

In research: SCR-245 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 SCR-245 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: SCR-245 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Amateur radio transmitters, Military electronics of the United States, Military equipment introduced in the 1930s, so understanding it makes those chapters shorter.
In everyday life: Look for SCR-245 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 SCR-245 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SCR-245 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 SCR-245 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SCR-245 in simple terms?

Why does SCR-245 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 SCR-245?

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 SCR-245.