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Diagram of simple spark gap transmitter and receiver.

Diagram of simple spark gap transmitter and receiver.

EARLY RADIO MUSEUM - TELEGRAPH & SCI INSTRUMENT MUSEUMS

EARLY RADIO MUSEUM - TELEGRAPH & SCI INSTRUMENT MUSEUMS

コヒーラの実験

コヒーラの実験

Simple, cheap DIY radio scanner antenna (receive only, for police scanners)

Simple, cheap DIY radio scanner antenna (receive only, for police scanners)

Cohere.jpg

Cohere.jpg

Antique iPod/MP3 amplifier and speaker made from 1920s Atwater Kent radio parts.

Antique iPod/MP3 amplifier and speaker made from 1920s Atwater Kent radio parts.

コヒーラ(ブランリー管・ラジオコンダクタ)

コヒーラ(ブランリー管・ラジオコンダクタ)

This Klitzen No.125 Rotary Gap is from 1920. The condenser uses mica as a dielectric and oil for insulation along with cooling. These components would have been used (along with an oscillation transformer) in a transformer-energized spark transmitter to provide the spark gap and the capacitance necessary for damped wave signal generation.  Using a rotary gap in the second circuit gave the advantage of audio frequency modulation.

This Klitzen No.125 Rotary Gap is from 1920. The condenser uses mica as a dielectric and oil for insulation along with cooling. These components would have been used (along with an oscillation transformer) in a transformer-energized spark transmitter to provide the spark gap and the capacitance necessary for damped wave signal generation. Using a rotary gap in the second circuit gave the advantage of audio frequency modulation.

BEACON-ラジオを自作しよう(3)

BEACON-ラジオを自作しよう(3)

Stone Vintage Radio Museum - Antique Radios, Wireless, Crystal Sets, Tubes, and Valves

Stone Vintage Radio Museum - Antique Radios, Wireless, Crystal Sets, Tubes, and Valves

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