How to make an am radio

How does an AM radio work?

AM radio technology is simpler than later transmission systems. An AM receiver detects amplitude variations in the radio waves at a particular frequency, then amplifies changes in the signal voltage to operate a loudspeaker or earphone.

Why is AM radio reception so bad?

If the battery operated radio reception is good, interference could be caused by the mains power – check the power cord is well insulated. If both radios are affected, the problem is likely to be electrical interference to the antenna, caused by a nearby electrical appliance.

Why does AM radio not work at night?

Most AM radio stations are required by the FCC’s rules to reduce their power or cease operating at night in order to avoid interference to other AM stations. … However, during nighttime hours the AM signals can travel over hundreds of miles by reflection from the ionosphere, a phenomenon called “skywave” propagation.

What is a good AM radio?

Our Picks For The Top AM Radios

  • The Best AM Radio.
  • Panasonic RF-2400D AM Radio.
  • Retekess V115 Portable Shortwave AM Radio.
  • Sony ICFP26 Portable AM Radio.
  • Sangean PR-D18BK Portable Protective Bumper Digital AM Radio.
  • Kaito KA500 Solar Powered 5-Way AM Radio.
  • Sangean LB-100 Ultra Rugged Compact AM Radio.

Do people still use AM radio?

Seems so retro, but it is still useful. Nevertheless, AM radio has been in decline for years, with many AM stations going out of business each year. Now there are only 4,684 left as of the end of 2015. … Most of the listeners moved on to FM or other radio sources.

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What is better FM or AM?

AM has poorer sound quality compared with FM, but is cheaper and can be transmitted over long distances. It has a lower bandwidth so it can have more stations available in any frequency range. FM is less prone to interference than AM. However, FM signals are impacted by physical barriers.

How do I block radio waves in my house?

As Scientific American points out, “Thin amounts of plastic wrap, wax paper, cotton and rubber are not likely to interfere with radio waves. However, aluminum foil, and other electrically conductive metals such as copper, can reflect and absorb the radio waves and consequently interfere with their transmission.”

What is the best diode for a crystal radio?

The 1N34A germanium diode is the modern substitute for galena and most other germanium small-signal diodes will also work well. Silicon diodes are not a good choice because their much higher barrier potential requires larger signals for efficient rectification.

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