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Setcom began making portable radio headsets for firefighters in the 1970s just as it had created the police motorcycle communications kit. Though they started making the headsets early on, they didn't fully step onto the fire communications scene until the late 1980s and early 1990s when they introduced their first intercom system built for ...
Earlier crystal radios suffered from severely reduced Q, and resulting selectivity, from the electrical load of the earphone or earpiece. Furthermore, with its efficient earpiece, the "rocket radio" did not require a large antenna to gather enough signal.
A classic Emerson transistor radio, circa 1958. A transistor radio is a small portable radio receiver that uses transistor-based circuitry.Previous portable radios used vacuum tubes, which were bulky, fragile, had a limited lifetime, consumed excessive power and required large heavy batteries.
Crystal earpieces are usually monaural devices with very low sound fidelity, but high sensitivity and impedance. Their peak use was probably with 1960s era transistor radios and hearing aids. They are not used with modern portable media players due to unacceptable sound quality.
Waveband Communications manufactures over 500 two-way radio communication products. The company product offerings include two-way radio batteries, antennas, battery packs, belt clips, chargers, ear inserts, tips, and plugs, headsets, portable radio adapters, receive only earpieces and remote speaker microphones.
H3-bluetooth Bluetooth Headset; H350 Bluetooth Headset; H500 Bluetooth Headset; ... MTS2000 Portable radio; DP/DM Series Portable/Mobile DMR Radio; Pagers. Tone and ...
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