| 1. | Most early spark transmitters were powered by batteries or Leyden jars.
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| 2. | Working with Ray Newby, he initially used high-frequency spark transmitters.
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| 3. | In the early years of the 20th century, before modern spark transmitters.
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| 4. | Manufacturers produced spark transmitters which generated long " ringing " waves with minimal damping.
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| 5. | Radio communication at this time employed spark transmitters, which were limited to sending messages in Morse code.
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| 6. | It was during this period that Fisher developed an interest in amateur radio, constructing rudimentary spark transmitters and receivers.
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| 7. | This station used a spark transmitter and could only transmit Morse code, so it was never used for entertainment broadcasts.
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| 8. | Beginning around 1905 continuous wave ( CW ) transmitters began to replace spark transmitters for radiotelegraphy because they had much greater range.
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| 9. | Another problem with the spark transmitter was a result of the shape of the waveform produced by each burst of electromagnetic radiation.
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| 10. | Reginald Fessenden's first attempts to transmit voice employed a spark transmitter operating at approximately 10, 000 sparks / second.
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