science

TA-57

TA-57 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 TA-57 rather than just read about it. In short: The TA-57 is a Soviet-era field telephone. It is a completely analog battery-powered wired system that is highly resistant to electronic interception and jamming.

Key takeaways

TA-57 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect TA-57 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of TA-57 from memory before moving on to harder problems.

Reference excerpt

The TA-57 is a Soviet-era field telephone. It is a completely analog battery-powered wired system that is highly resistant to electronic interception and jamming.

History The first model of the TA-57 rolled out in 1957 for usage by the Soviet Armed Forces. As of 2022, the TA-57 was reported to be in use by Russian forces in the Russo-Ukrainian War. It has been documented in human rights reports as a torture device during the conflict, with euphemisms utilizing the TA-57 as a "phone call to Putin" or "call to Lenin". It was also used to torture a suspect of the Crocus City Hall attack.

Description The TA-57 can be used for induction calls working with 2-wire lines in an OB (local battery) or a ZB (central battery) operation. It can be used to transmit voice messaging in ranges between 0.3 and 3.4 kHz, with a calling frequency of 15 to 45 Hz. Absolute signal level at output of transmission path with a 600Ω load ranges between −3 and +3 dBu. It also a has a deployment time of 2 minutes. Power is primarily drawn from a 10V lead–acid battery GB-U-1.3 (ГБ-10-У-1.3) with a capacity of 1.3 Ah, alternatively a 9V block battery can be utilized. In OB battery operation, a hand cranked magneto can be used to generate ringing. The enclosing and body is made of Bakelite and its dimensions measure 22.2 x 16.5 x 7.9 cm, and weighs 2.8 kg. There are multiple cables that are used, which can establish the range of the phone:

Field cable P-275 (П-275); 20 km range Field cable P-274 (П-274); 40 km range Field cable P-268 (П-268); 40–45 km range Field cable P-271 (П-271); 125 km range Overhead line; up to 170 km range. With a reception amplifier, the signal range of the phone can increase by 30-50%. It is intended for operation ranging from -40 °C to 50 °C, and a max humidity of 98% at 25 °C. A modernized variant of it is known as a TA-57U.

Users Ukraine Russia

Former users Soviet Union Iraq – one specimen in the Imperial War Museum was acquired during Operation Granby.

References

External links Media related to TA-57 at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with TA-57

Start with the simplest possible case. Write down what TA-57 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 TA-57 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 TA-57 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 TA-57

In research: TA-57 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 TA-57 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: TA-57 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1957 in the Soviet Union, Field telephones, Military equipment of Iraq, so understanding it makes those chapters shorter.
In everyday life: Look for TA-57 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 TA-57 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what TA-57 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 TA-57 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TA-57 in simple terms?

The TA-57 is a Soviet-era field telephone. It is a completely analog battery-powered wired system that is highly resistant to electronic interception and jamming.

Why does TA-57 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 TA-57?

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 TA-57.