FM AM Antenna is like a translator shuttling between electromagnetic waves and sound, writing signal codes in space with conductor as pen and magnetic field as ink. When the electromagnetic waves in FM/AM band come in like invisible waves, the antenna immediately induces a weak current, just like converting voiceprints in the air into recognizable electric signal characters. After detection, decoding, filtering, polishing and amplification, these signals are finally restored to clear human voices in the loudspeaker-just like translating foreign language news into local language sentence by sentence, allowing distant radio stories to penetrate the space barrier. Vehicle and marine Car Antenna are signal fighters against harsh environment: the vehicle Walkie Talkie Antenna is covered with AES weather-resistant plastic armor, which resists the bump impact with the elasticity of nylon skeleton in the temperature difference battlefield from-40℃ to 80℃, and the built-in dual-band switching circuit is like tactical radar, which locks FM/AM signals in real time; The marine Indoor Antenna uses 316L stainless steel as the skeleton and glass fiber reinforced plastic as the shield. In the protracted war between salt fog and typhoon, the directional gain "telescope" penetrates the ocean multipath interference, and the record of 1000 hours of salt fog test proves its persistence as a maritime communication sentry. The home stereo Car Radio Antenna is the sound quality housekeeper in the living room. The FM wavelength is accurately measured by an "auditory ruler" with a length of 75cm, and the signal loss is controlled within 1.5% by a "nerve vein" with oxygen-free copper and silver plating. When the electromagnetic noise of the microwave oven is disturbing like Xiong Haizi, the anti-static PVC shell acts as a sound barrier, and the 55MPa tensile strength of the ABS skeleton ensures that the angle adjustment will not be deformed for ten years-it is like a low-key housekeeper who always delivers pure sound protoplasm for Hi-Fi audio in the undercurrent of interference between WiFi and household appliances. What is the specific function of detection/filtering/amplification circuit? Detection: stripping high-frequency carrier and extracting audio signal (similar to taking out stationery from an envelope) Filtering: filter out foreign waves by LC circuit and keep the target frequency band (for example, FM only keeps 87-108MHz). Amplification: amplify microvolt signal to volt level, and the signal-to-noise ratio of high-quality amplifier should be ≥65dB. Metal antenna is better than plastic antenna? AES plastic antenna has better weather resistance than metal and avoids the risk of lightning. Oxygen-free copper core+plastic shell combination, giving consideration to conductivity and anti-interference Data comparison: A certain brand of AES antenna has been used in coastal areas for 5 years, and the signal attenuation is 12% less than that of metal antenna.
