Abstract
RECORDS of wireless echoes by the group-retardation method of Breit and Tuve1 show that the intensities and number of echoes diminish as the receiver is brought near the transmitter. The minimum distance from the transmitter at which we could detect echoes was 400 metres2. The nearest distance at which interference phenomena between direct and sky waves have ever been noticed seems to be 180 yards3. The difficulty experienced in recording echoes at short distances from the transmitter is commonly supposed to be due to the enormous strength of the direct ground signal as compared with the strength of the echoes. This is undoubtedly one reason; but there is another reason to which proper attention has not been paid by investigators in this field.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on SpringerLink
- Instant access to the full article PDF.
USD 39.95
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Breit and Tuve, Phys. Rev., 27, 554; 1926.
Mitra and Rakshit, Phil. Mag., 15, 20; 1933.
Appleton and Naismith, Proc. Roy. Soc., A, 137, 36; 1932.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
MITRA, S., RAKSHIT, H. Recording Wireless Echoes at the Transmitting Station. Nature 131, 657 (1933). https://doi.org/10.1038/131657a0
Issue date:
DOI: https://doi.org/10.1038/131657a0
This article is cited by
-
Recording Wireless Echoes at the Transmitting Station
Nature (1933)
