LORAN-A was a less accurate system operating in the upper medium wave frequency band prior to deployment of the more accurate LORAN-C system. For LORAN-A the transmission frequencies 1750 kH.
How did communications technology change in the 1960s?
The 1960s saw fundamental advances in four important areas of communications technology: data transmission through the analog voice channels of the telephone network, computer networking, satellite communications, and lasers and optical fibers. These years also witnessed the initial steps toward the breakup of the Bell telephone monopoly in the US.
What was a common airborne receiver of the era?
A common airborne receiver of that era was the R-65/APN-9 which combined the receiver and cathode ray tube (CRT) indicator into a single relatively lightweight unit replacing the two larger, separate receiver and indicator units which comprised the predecessor APN-4 system.
How were radio stations connected?
The stations were connected via line-of-sight horn antennas which transmitted (or received) microwave signals. A call placed in one part of the country would be passed on to the next relay station, then passed on to the next, and so on until it reached the station nearest its destination.