Spread-spectrum signals are highly resistant to deliberate jamming, unless the adversary has knowledge of the spreading characteristics. Military radios use cryptographic techniques to generate the channel sequence under the control of a secret Transmission Security Key (TRANSEC) that the sender and receiver share in advance.
By itself, frequency hopping provides only limited protection against eavesdropping and jamming. Most modern military frequency hopping radios also employ separate encryption devices such as the KY-57. U.S. military radios that use frequency hopping include the JTIDS/MIDS family, HAVE QUICK and SINCGARS.
In the US, since the Federal Communications Commission (FCC) amended rules to allow frequency hopping spread spectrum systems in the unregulated 2.4 GHz band, many consumer devices in that band have employed various spread-spectrum modes.
Some walkie-talkies that employ frequency-hopping spread spectrum technology have been developed for unlicensed use on the 900 MHz band.
In 1966…The Beatles arrived at Chicago's O'Hare Airport to start their last tour of the U.S. They held a press conference at the Astor Towers Hotel where John Lennon apologized for his remarks that the Beatles were "more popular than Jesus now."
John explained, "If I had said television is more popular than Jesus, I might have got away with it, but I just happened to be talking to a friend and I used the words "Beatles" as a remote thing, not as what I think - as Beatles, as those other Beatles like other people see us ... I'm not saying that we're better or greater, or comparing us with Jesus Christ as a person or God as a thing or whatever it is. I just said what I said and it was wrong. Or it was taken wrong. And now it's all this ... I never meant it to be a lousy anti-religious thing. I apologize if that will make you happy. I still don't know quite what I've done. I've tried to tell you what I did do but if you want me to apologize, if that will make you happy, then okay, I'm sorry.
In 1972...Long John Nebel does last show at WNBC.
Jim Harmon, author of “the Great Radio Heroes” appears on Long John Nebel’s show and discusses Old Time Radio. This broadcast is from 1967 and was heard on WNBC.
In 1984...President Ronald Reagan was preparing for his weekly radio broadcast when, during testing of the microphone, the President said of the Soviet Union, “…I have signed legislation that will outlaw Russia. We begin bombing in five minutes.“ He was just jesting as he was testing. Funny, actually, that this could happen to ‘Dutch’ Reagan — a former radio sportscaster for WHO in Des Moines, Iowa and other radio stations — not to mention TV and film. The remark, literally, bombed … though nothing more serious happened.
In 1995...bandleader/singer Phil Harris, a comedy contributor on radio, TV & The Jungle Book Movie, suffered heart failure and died at age 91. The Phil Harris-Alice Faye Show is acknowledged to be one of the best-written & best-performed comedy favorites from the era of Old Time Radio.
In 2010…Former Pittsburgh Pirates announcer/former Pirates pitcher Nellie King died of Parkinson's disease at 82.
No comments:
Post a Comment