1216 Spark Gap Transmitter


Frequency Range: 300 and 600 metres
Circa: 1899 to 1913 (?)
Comment This Marconi transmitter was one of the most popular marine transmitters during its heyday.

Marconi began selling this type of spark coil when his company was first established  It was used as a complete transmitter before he began to add tuning in 1899 . After that, tuning was used when a ship was in port  in order to reduce the bandwidth of the emitted signal.  Without tuning,
the voltage peak was much higher. He called this  PLAIN ARIEL. It would transmit 1/4 KW ,an average of 65 miles and 100 miles on rare occasions. Tuning was added with a coil in a wooden box on the wall and LEYDEN JARS as condensers. There were two tuned bands called BAND A (300 meters ), and BAND B (600 meters).

1216_1969_0878_001 .j
1216 spark gap transmitter. This artifact is held in the collection of Canada Science and Technology Museum, Ottawa. It is not known if this is a complete spark gap transmitter or just the coil and spark gap alone.  (Photo courtesy Canada Science and Technology Museum, Ottawa) 

These are all the components that are required for a spark gap transmitter .(Image courtesy American Radio Relay League) 

Contributors and Credits:

1) https://ingeniumcanada.org/ingenium/collection-research/collection-item.php?id=1969.0878.001

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Feb 22/18