TECSUN AN-100 Tunable Medium Wave Crystal Radio Loop Antenna Kit Passive AM Receiver Science Education Toy
Hero Section: Listen to the Whispers of the Airwaves
Imagine a device that pulls music and voices from thin air, without batteries, without plugs, and without a single drop of electricity. This is the magic of the "Crystal Radio" (Mineral Radio). By harnessing the raw energy of radio waves through a large resonant loop coil, this classic receiver invites you to experience the purest form of radio technology. It is a journey back to the dawn of wireless communication—a test of patience, a lesson in physics, and a beautiful scientific instrument for your desktop.
Why Choose This Loop Crystal Radio?
- Zero Energy Consumption: This is a truly passive device. It requires no power source. It runs entirely on the electromagnetic energy harvested from the broadcast signal itself. It is the ultimate eco-friendly gadget.
- High-Q Loop Design: Unlike basic wire antennas, this model features a large 22.5cm diameter copper coil. This "Loop" design acts as a giant inductor, significantly improving sensitivity and selectivity for Medium Wave (AM) signals.
- The Joy of "DXing": In a world of instant digital streaming, there is a unique thrill in slowly turning the dial, listening through the static, and suddenly catching a broadcast from miles away. It turns radio listening into an active treasure hunt.
- Educational Masterpiece: Perfect for STEM education. It physically demonstrates the principles of resonance, tuning circuits, and amplitude modulation (AM) detection. It’s a hands-on physics lab that fits on a shelf.
Technical Highlights: How It Works
- The LC Resonant Circuit: The large loop coil acts as both the antenna and the inductor (L). Combined with the variable capacitor (tuning dial), it forms a resonant circuit that "vibrates" at the specific frequency of a radio station, isolating it from the background noise.
- Passive Detection: The circuit uses a semiconductor element (acting as the modern equivalent of the galena crystal) to rectify the radio frequency signal into an audio signal that can be heard through the headphones.
- Directional Tuning: Because it uses a loop antenna, the radio is directional. You can rotate the entire unit to maximize the signal strength of a specific station or "null out" interference from unwanted directions.
Specifications
- Type: Passive Crystal Radio (Mineral Radio)
- Frequency Band: Medium Wave (AM Broadcast Band)
- Coil Diameter: 22.5cm
- Base Dimensions: 23cm (L) x 6.5cm (W)
- Overall Height: 25cm
- Power Source: None (Passive)
- Material: Plastic Chassis / Copper Coil / Electronic Components
- Audio Output: 3.5mm Headphone Jack
Usage Scenario
Find a quiet corner of your home, away from modern electronic interference (like routers or LED lights). Put on the included high-sensitivity headphones. Slowly, very slowly, rotate the tuning knob. At first, you hear silence or faint static. Then, a voice emerges—a talk show host, a news broadcast, or a classic song. You rotate the radio base slightly to clarify the sound. You are listening to the world exactly as the pioneers of radio did a century ago.
Important Tips for Success
- Signal Strength Matters: Since this radio has no amplifier, it relies entirely on the strength of the radio waves. It works best in areas with strong local AM stations. In remote areas, reception may be faint.
- Patience is Key: This is not a modern digital radio. Tuning requires a slow hand and a quiet environment. It is designed for experimentation and learning, not for filling a room with loud sound.
- Headphones: You must use the included high-sensitivity headphones. Standard earbuds may have impedance that is too low for this passive circuit to drive effectively.
Customer Support
We love the science of radio. If you need tips on improving reception or understanding the circuit, please contact us: service@helloworld7.com
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