June 1946 Radio-Craft
[Table of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Radio-Craft,
published 1929 - 1953. All copyrights are hereby acknowledged.
In the 1940s, the LORAN (LOng RAnge
Navigation) system, originally designed at the Massachusetts of Technology
(MIT), was considered as significant of a breakthrough technology as
(Global Positioning System) was when it became operational in the 1990s. Unlike
with GPS and its P (precision) and C/A (coarse/acquisition) codes for military
and civilian use, respectively, the full accuracy capability of LORAN was
available from the start to both military and civilian users. There were no
encoded signals to discriminate between users. Not until the year
2000 did civilian use gain access to full GPS accuracy. As would be expected,
LORAN underwent a number of improvements over the years, and evolved into
LORAN−C, which offered greater range and accuracy.
Sperry Gyroscope Company, Inc. - LORAN
Loran by Sperry
Accurate LOng RAnge Navigation ... anytime ... in all weather
With Sperry Loran the navigator has at hand a quick and accurate means of determining
a ship's position at any time, in all kinds of weather. This system involves the
reception of accurately timed radio pulses from shore-based transmitting stations,
usually 200 to 400 miles apart.
The difference in time of arrival of signals from a pair of transmitting stations
is measured and the time difference is then used to determine, from special charts
or tables, a line-of-position on the earth's surface. When two lines-of-position
from two different pairs of Loran stations are crossed, you have a "Loran fix. "
Fixes are obtainable at distances from shore stations up to 1400 miles at night,
700 miles in daytime.
In your consideration of Loran, note particularly that Sperry's equipment is
easy to operate. A Time Difference Meter (see illustration above) greatly simplifies
the operator's work and prevents errors in readings.
Sperry Loran is hacked by a world-wide service organization and meets the usual
high standards of test and performance of all Sperry products. Loran equipments
in limited quantity are ready for immediate delivery.
* The Time Difference Meter, giving position references directly, is a Sperry
Sperry Gyroscope Company, Inc.
Executive Offices: Greak Neck, New York • Division of the Sperry Corporation
Los Angeles • San Francisco • New Orleans • Honolulu • cleveland •
Gyroscopics • Electronics • Radar • Automatic Computation •
Posted September 24, 2021