Catalogue
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Short Distance Wireless Telephone Set Type TT2, by Marconi Company, London, c. 1920
Inventory Number: 46879
Number of documents: 2
Document Type: Printed Documentation
Document Heading: Reference
Text:
This set is described by H.M. Dowsett in "Wireless Telegraphy and Telephony" (The Wireless Press, London, 1920), pp 145-8. The telephone microphone is missing from the present example; the valve fitted on top is of similar external format to the original Type S transmitter.
Document Type: Miscellaneous Note
Document Heading: Technical Details
Text:
This short distance wireless telephone set was designed to work with a small aerial, having a natural wavelength of approximately 250 metres. The transmitting-valve circuit was tuned to 250 metres wavelength exactly and it was essential that to obtain the best results, the aerial was tuned to the same wavelength.
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