science

Hallicrafters SX-28

Hallicrafters SX-28 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 Hallicrafters SX-28 rather than just read about it. In short: The Hallicrafters SX-28 "Super Skyrider" is an American shortwave communications receiver that was produced between 1940 and 1946 that saw wide use by amateur radio, government and military services. History In July 1940, the Hallicrafters Company announced the SX-28 "Super Skyrider", the result of a development effort by 12 staff engineers and analysis of more than 600 reports that included input from U.S. governme…

Key takeaways

Hallicrafters SX-28 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hallicrafters SX-28 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hallicrafters SX-28 from memory before moving on to harder problems.

Reference excerpt

The Hallicrafters SX-28 "Super Skyrider" is an American shortwave communications receiver that was produced between 1940 and 1946 that saw wide use by amateur radio, government and military services.

History In July 1940, the Hallicrafters Company announced the SX-28 "Super Skyrider", the result of a development effort by 12 staff engineers and analysis of more than 600 reports that included input from U.S. government engineers, commercial users, and amateur radio operators. The SX-28's distinctive art deco styling was considered sleek and strikingly modern in 1940. The radio frequency coverage was 550 kHz (0.55 MHz) to 43 MHz in six bands. The SX-28 included an Amplified AVC, a Lamb Noise Silencer, Calibrated bandspread, and Push-Pull audio output. The SX-28 was known for its high fidelity audio together with high sensitivity, stability and selectivity, and good purchase value.

The SX-28 saw use by various branches of U.S. and allied military and intelligence agencies during World War II. SX-28 and Hallicrafters S-27 and S-36 receivers were often rack mounted in British government listening posts and secret listening stations for monitoring German radar and communications during the war such as Beaumanor Hall in the English Midlands where German and Italian encrypted radio messages were sent to Bletchley Park for decoding. A number of the receivers were sent to the Soviet Union as a part of the Lend Lease Act, subsequently modified to accommodate Russian tubes. Hallicrafters published that 50,000 SX-28 and SX-28As had been built by the end of its production run in 1946, however the serial numbers appear to indicate a production figure of half, approximately 27,500 receivers. Many of the SX-28/28As that exist today are in the hands of vintage amateur radio collectors and amateur radio operators.

The "Skyrider" name The name "Skyrider" was intended to bestow an aura of exotic adventure to Hallicrafters products and had a long history with the company. The first Hallicrafters set to be dubbed with the name was the 1932 S-1.

Variations

Variations and special versions of the SX-28 were produced over the years. During World War II, Hallicrafters continued to redesign portions of the SX-28.

Specialty versions AN/GRR-2 - introduced in February 1944 became the U.S. Navy SX-28A, a ruggedized unit built for U.S. Army Signal Corps and U.S. Navy use.

See also BC-348 Hammarlund Super Pro National HRO R-390A

References

General references de Hensler, Max. The Hallicrafters Story. Charleston, West Virginia: ARCA Press, 1988 Moore, Raymond. Communications Receivers, Fourth Edition. La Belle, Florida: RSM Communications, 1997 Osterman, Fred. Shortwave Receivers Past and Present. Reynoldsburg, Ohio: Universal Radio Research, 1998 Dachis, Chuck. Radios by Hallicrafters. Atglen, Pennsylvania: Schiffer Books for Collectors, 1999 SX-28 and SX-28A Manuals, VOLs. XII and XVI, Riders Perpetual Troubleshooting Manual AN/GRR-2 Manual, Army # TM-11-874, military SX-28A QST, July, 1940 to 1946 ARRL Handbook 1946

External links Western Historic Radio Museum, The Hallicrafters SX-28, A pre-war masterpiece Archived 2009-04-13 at the Wayback Machine

Illustrations

SX-28 "Super Skyrider" logo on front panel

Worked examples

Example 1 — a first encounter with Hallicrafters SX-28

Start with the simplest possible case. Write down what Hallicrafters SX-28 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 Hallicrafters SX-28 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 Hallicrafters SX-28 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 Hallicrafters SX-28

In research: Hallicrafters SX-28 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 Hallicrafters SX-28 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: Hallicrafters SX-28 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Amateur radio receivers, Military equipment introduced from 1940 to 1944, Military radio systems of the United States, so understanding it makes those chapters shorter.
In everyday life: Look for Hallicrafters SX-28 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 Hallicrafters SX-28 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hallicrafters SX-28 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 Hallicrafters SX-28 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hallicrafters SX-28 in simple terms?

The Hallicrafters SX-28 "Super Skyrider" is an American shortwave communications receiver that was produced between 1940 and 1946 that saw wide use by amateur radio, government and military services. History In July 1940, the Hallicrafters Company announced the SX-28 "Super Skyrider", the result of…

Why does Hallicrafters SX-28 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 Hallicrafters SX-28?

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 Hallicrafters SX-28.