science

SINCGARS

SINCGARS 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 SINCGARS rather than just read about it. In short: Single Channel Ground and Airborne Radio System (SINCGARS) is a VHF combat-net radio (CNR) used by U.S. and allied military forces. In the CNR network, the SINCGARS' primary role is voice transmission between surface and airborne command and control (C2) assets.

Key takeaways

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

Reference excerpt

Single Channel Ground and Airborne Radio System (SINCGARS) is a VHF combat-net radio (CNR) used by U.S. and allied military forces. In the CNR network, the SINCGARS' primary role is voice transmission between surface and airborne command and control (C2) assets. The SINCGARS family replaced the Vietnam War-era synthesized single frequency radios (AN/PRC-77 and AN/VRC-12), although it can work with them. The airborne AN/ARC-201 radio is phasing out the older tactical air-to-ground radios (AN/ARC-114 and AN/ARC-131). The SINCGARS is designed on a modular basis to achieve maximum commonality among various ground, maritime, and airborne configurations. A common receiver/transmitter (RT) is used in the ground configurations. The modular design also reduces the burden on the logistics system to provide repair parts. The SINCGARS can operate in either the single-channel (SC) or frequency hopping (FH) mode, and stores both SC frequencies and FH loadsets. The system is compatible with all current U.S. and allied VHF-frequency modulation (FM) radios in the SC, nonsecure mode. The SINCGARS operates on any of 2320 channels between 30 and 88 megahertz (MHz) with a channel separation of 25 kilohertz (kHz). It accepts either digital or analog inputs and superimposes the signal onto a radio frequency (RF) carrier wave. In FH mode, the input changes frequency about 100 times per second over portions of the tactical VHF-FM range. These continual changes in frequency hinder threat interception and jamming units from locating or disrupting friendly communications. The SINCGARS provides data rates up to 16,000 bits per second. Enhanced data modes provide packet and RS-232 data. The enhanced data modes available with the System Improvement Program (SIP) and Advanced System Improvement Program (ASIP) radios also enable forward error correction (FEC), and increased speed, range, and accuracy of data transmissions. Most ground SINCGARS have the capability to control output power; however, most airborne SINCGARS are fixed power. Those RTs with power settings can vary transmission range from approximately 200 meters (660 feet) to 10 kilometers (km) (6.2 miles). Adding a power amplifier increases the line of sight (LOS) range to approximately 40 km (25 miles). (These ranges are for planning purposes only; terrain, weather, and antenna height can affect transmission range.) The variable output power level allows users to operate on the minimum power necessary to maintain reliable communications, thus lessening the electromagnetic signature given off by their radio sets. This capability is of particular importance at major command posts, which operate in multiple networks. SC CNR users outside the FH network can use a hailing method to request access to the network. When hailing a network, a user outside the network contacts the network control station (NCS) on the cue frequency. In the active FH mode, the SINCGARS gives audible and visual signals to the operator that an external subscriber wants to communicate with the FH network. The SINCGARS operator must change to the cue frequency to communicate with the outside radio system. The network can be set to a manual frequency for initial network activation. The manual frequency provides a common frequency for all members of the network to verify that the equipment is operational. During initial net activation, all operators in the net tune to the manual frequency. After communications are established, the net switches to the FH mode and the NCS transfers the hopping variables to the outstations. More than 570,000 radios have been purchased. There have been several system improvement programs, including the Integrated Communications Security (ICOM) models, which have provided integrated voice and data encryption, the Special Improvement Program (SIP) models, which add additional data modes, and the advanced SIP (ASIP) models, which are less than half the size and weight of ICOM and SIP models and provided enhanced FEC (forward error correction) data modes, RS-232 asynchronous data, packet data formats, and direct interfacing to Precision Lightweight GPS Receiver (PLGR) devices providing radio level situational awareness capability. In 1992, the U.S. Air Force awarded a contract to replace the AN/ARC-188 for communications between Air Force aircraft and Army units. In March 2022, the U.S. Army awarded a hybrid contract valued at up to $6.1 billion for the modernization of Single Channel Ground and Airborne Radio System (SINCGARS) radios to meet National Security Agency cryptographic requirements. The indefinite-delivery, indefinite-quantity contract, structured on a cost-plus-fixed-fee and firm-fixed-price basis, was awarded to Thales Defense and Security Inc. (Clarksburg, Maryland) and L3Harris Technologies Inc. (Rochester, New York), who will compete for task orders. The contracting activity is managed by the U.S. Army Contracting Command at Aberdeen Proving Ground, Maryland, with work locations and funding determined per order. The estimated completion date is March 24, 2032.

Timeline

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with SINCGARS

Start with the simplest possible case. Write down what SINCGARS 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 SINCGARS 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 SINCGARS 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 SINCGARS

In research: SINCGARS 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 SINCGARS 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: SINCGARS is common in secondary-school and first-year university syllabi. It links to neighbouring topics Military electronics of the United States, Military equipment introduced in the 1980s, National Security Agency encryption devices, so understanding it makes those chapters shorter.
In everyday life: Look for SINCGARS 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 SINCGARS in 20 minutes

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

Frequently asked questions

What is SINCGARS in simple terms?

Why does SINCGARS 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 SINCGARS?

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 SINCGARS.