science

Personal Role Radio

Personal Role Radio 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 Personal Role Radio rather than just read about it. In short: The H4855 Personal Role Radio (PRR) is a small short-range half-duplex UHF transmitter/receiver in service with the British Army, Royal Marines, Royal Navy, Royal Air Force Regiment and US Marine Corps. The radio has a range of 500 m (1,600 ft), weighs 1.5 kg (3.3 lb) providing direct tactical soldier-to-soldier communication.

Key takeaways

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

Reference excerpt

The H4855 Personal Role Radio (PRR) is a small short-range half-duplex UHF transmitter/receiver in service with the British Army, Royal Marines, Royal Navy, Royal Air Force Regiment and US Marine Corps. The radio has a range of 500 m (1,600 ft), weighs 1.5 kg (3.3 lb) providing direct tactical soldier-to-soldier communication. Operating in the 2.4 GHz (12 cm) band, PRR has 256 different radio channels and a battery life of 20 hours continuous use. Effective through thick cover or the walls of buildings, PRR is issued to every member of an eight-strong infantry section. The PRR is also referred as AN/PRC-343 and as Integrated Intra-Squad Radio (IISR) in US military usage. In accordance with the Joint Electronics Type Designation System (JETDS), the "AN/PRC-343" designation represents the 343rd design of an Army-Navy electronic device for portable two-way communications radio. The JETDS system is also now used to name all Department of Defense, NATO, and others' electronic systems.

History Selex ES developed the H4855 PRR in 1999 and introduced it for worldwide military use in 2002. It is now manufactured by Leonardo S.p.A.. The PRR was originally part of the wider Bowman radio project but was separated from Bowman in October 1999 for faster implementation. The first of 45,000 units formally entered service in early 2002. The PRR was replaced by the H-174-4855-ELSA Enhanced Encrypted Personal Role Radio or EZPRR in 2005, also developed by Selex.

Features Additional features include the ability for re-configuring in the field with 16 channels available on a selector knob. Fifteen other groups of 16 channels are also available. The radio operates using a spread spectrum and has transmission security being designed with low probability of intercept (LPI)/low probability of detection (LPD). An inbuilt receiver enables the radio to be keyed remotely via a short range encoded Push-to-talk (PTT) switch fob, the switch being mounted on a weapon or hand grip of a military vehicle. The switch code can be changed in the field and the radio configured to work with up to 4 different switches (useful for soldiers sharing transport such as motor cycles where the PTT switch can be handlebar mounted). The side-mounted switch-pack has a single transmit switch for general use. It also has a double switch pack and auxiliary lead and connector to operate a second radio from the same users headset. Multiple security switches and block outs are fitted to prevent re-transmission of secure Bowman signals over the personal network. The switch unit is secured with a single screw, the slotted head being wide enough to accept the tang of the standard screwdriver tool supplied with the SA80 rifle. Removing the switch assembly also gains access to the 16 group selector switch allowing the radio to reconfigured in a to a different group of channels. The PRR uses a dedicated headset; no inbuilt speaker or microphone are included in the radio. The single ear piece has attached a 51 cm (20 in) cord connecting the radio and the mike on a flexible boom. The headset design is a ventilated plate with a waterproof earpiece mounted on a frame. The design is such that normal conversation and surrounding sounds are not blocked from the user, a soft ear pad rests against the user and an open mesh headband with straps secures it. The design allows the headset to be worn with very little strap pressure for long periods. The plate has a flat external surface and can be used with a standard ear muff type hearing protector over the top; this requirement being for training and range practice use when not in combat. The microphone is a noise cancelling electret type housed in a black glass filled nylon case made from a type of nylon that will crystallise at flash temperatures giving it a good chance of survival .

Specifications Frequency coverage: 2.4–2.483 GHz (12.49–12.07 cm) using 256 channels in 16 channel groups Output power: 50 mW Range: 500 m (1,600 ft) in open terrain RF modulation: Quadrature Phase-Shift Keying (QPSK) Direct-Sequence Spread Spectrum (DSSS) Voice modulation: Continuously Variable Slope Delta CVSD Data protocol: Modified IEEE 802.11 Weight: 1.5 kg (3.3 lb) Power supply: 2 AA batteries, 20 hours continuous use

See also List of military electronics of the United States

Footnotes

References

External links

Elite UK Forces.info - Personal Role Radio

Illustrations

Worked examples

Example 1 — a first encounter with Personal Role Radio

Start with the simplest possible case. Write down what Personal Role Radio 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 Personal Role Radio 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 Personal Role Radio 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 Personal Role Radio

In research: Personal Role Radio 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 Personal Role Radio 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: Personal Role Radio is common in secondary-school and first-year university syllabi. It links to neighbouring topics British military radio, Military electronics of the United States, Military radio systems, so understanding it makes those chapters shorter.
In everyday life: Look for Personal Role Radio 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 Personal Role Radio in 20 minutes

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

Frequently asked questions

What is Personal Role Radio in simple terms?

Why does Personal Role Radio 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 Personal Role Radio?

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 Personal Role Radio.