About training intercept operators … I doubt that Morse is used very often by the opposition, even with good code books. But if we stopped training people to read it, that would be a vulnerability.
wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Nov 21, 2017, at 8:34 PM, Ron D'Eau Claire <r...@cobi.biz> wrote: > > Fred, it's called LiFi and uses the ability of LED light sources to handle > high frequency modulation to send data securely since one has to intercept > the actual beam to even get the data, much less decode the information. > Apparently pretty high data rates are possible with the system. > > Here's a press article from about a year ago. > > http://dailycaller.com/2016/08/10/revamped-100-year-old-lamp-will-help-the-navy-counter-russia-and-china/ > > I'm sure we Hams will find a use for the technology, Hi! > > Way back in 1955 when I was in High School I created a very popular display > that used my S-38 receiver tuned to a popular station. Current powering a 6V > lantern passed through the S38's audio output transformer to modulate the > light. The lighet was received by a photoelectric tube across the table, > amplified and the sound of the radio station played in a remote speaker. The > sound could be interrupted by passing one's hand in from of the light. > > Even though it was an incandescent bulb with its thermal lag, it still > reproduced good AM quality audio. > > It was good enough (in 1955) that I was encouraged to display it at the > annual Science Fair where it worked too well. Someone stole the photoelectric > tube from the display before it could be judged -- but I still got an A on > the project! > > 73, Ron AC7AC > > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Fred Jensen > Sent: Monday, November 20, 2017 12:34 PM > To: elecraft@mailman.qth.net > Subject: Re: [Elecraft] O.T. Morse is not dead, at least in the U.S. Navy > > OK, what's different then from WW2 signal lamp usage? I thought they were > using a modified lamp with QRQ Morse decoded in some sort of > hardward/software device, or a digital mode. > > 73, > > Fred ["Skip"] K6DGW > Sparks NV DM09dn > Washoe County > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to wun...@wunderwood.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
