While frequency-hopping was first introduced in a patent filed by Nikola Tesla in 19000, I've always been fascinated by the role of Austrian actress Hedy Lamarr in the development of spread-spectrum.
According to Wikipedia, " Lamarr had learned about the problem at defense meetings she had attended with her former husband Friedrich Mandl, who was an Austrian arms manufacturer. The Antheil-Lamarr version of frequency hopping used a piano-roll to change among 88 frequencies, and was intended to make radio-guided torpedoes harder for enemies to detect or to jam. The patent came to light during patent searches in the 1950s when ITT Corporation and other private firms began to develop Code Division Multiple Access (CDMA), a civilian form of spread spectrum." The Antheil-Lamarr patent was granted in 1942. http://www.women-inventors.com/Hedy-Lammar.asp Jim - K6JM ----- Original Message ----- From: Andy obrien To: [email protected] Sent: Thursday, February 18, 2010 5:23 PM Subject: Re: [digitalradio] ROS, legal in USA? The description says it uses spread-spectrun On Thu, Feb 18, 2010 at 7:47 PM, Dave Ackrill <[email protected]> wrote:
