"Glen Herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message news:b4zUa.135069$wk6.35585@rwcrnsc52.ops.asp.att.net... snip> > (WWV has a transmitter with a 20KHz carrier trying to cover the whole US > with one transmitter. That is the lowest I know for a real radio > transmission. It might even be FSK.)Hello Glen, et. al., The US Navy has a transmitter at 76Hz which offers worldwide coverage for its submarine fleet. See http://www.vlf.it/submarine/sbmarine.html for details Clay> > -- glen > >
Max Bit rate question
Started by ●July 22, 2003
Reply by ●July 31, 20032003-07-31
Reply by ●July 31, 20032003-07-31
"Clay S. Turner" wrote:> > "Glen Herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message > news:b4zUa.135069$wk6.35585@rwcrnsc52.ops.asp.att.net... > > snip > > > > > (WWV has a transmitter with a 20KHz carrier trying to cover the whole US > > with one transmitter. That is the lowest I know for a real radio > > transmission. It might even be FSK.) > > Hello Glen, et. al., > > The US Navy has a transmitter at 76Hz which offers worldwide coverage for > its submarine fleet. > > See > http://www.vlf.it/submarine/sbmarine.html > for details > > Clay > > > > > -- glen > > > >They have a pretty big antenna for it too! Does anyone know the maximum bit rate or how far out significant sidebands extend? Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●July 31, 20032003-07-31
"Clay S. Turner" <physicsNOOOOSPPPPAMMMM@bellsouth.net> wrote in message news:%i8Wa.15255$5O3.8866@fe03.atl2.webusenet.com...> > "Glen Herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message > news:b4zUa.135069$wk6.35585@rwcrnsc52.ops.asp.att.net... > > snip > > > > > (WWV has a transmitter with a 20KHz carrier trying to cover the whole US > > with one transmitter. That is the lowest I know for a real radio > > transmission. It might even be FSK.) > > Hello Glen, et. al., > > The US Navy has a transmitter at 76Hz which offers worldwide coverage for > its submarine fleet.I forgot about that one. We did have a submarine homework problem in an optics class once which needed the index of refraction of water at 15kHz. (It is about 9.) That may have been before the 76Hz transmitter. -- glen
Reply by ●July 31, 20032003-07-31
Glen Herrmannsfeldt wrote:> > "Clay S. Turner" <physicsNOOOOSPPPPAMMMM@bellsouth.net> wrote in message > news:%i8Wa.15255$5O3.8866@fe03.atl2.webusenet.com... > > > > "Glen Herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message > > news:b4zUa.135069$wk6.35585@rwcrnsc52.ops.asp.att.net... > > > > snip > > > > > > > > (WWV has a transmitter with a 20KHz carrier trying to cover the whole US > > > with one transmitter. That is the lowest I know for a real radio > > > transmission. It might even be FSK.) > > > > Hello Glen, et. al., > > > > The US Navy has a transmitter at 76Hz which offers worldwide coverage for > > its submarine fleet. > > I forgot about that one. > > We did have a submarine homework problem in an optics class once which > needed the index of refraction of water at 15kHz. (It is about 9.) That > may have been before the 76Hz transmitter. > > -- glenThat monster -- or at least experiments leading to it -- dated to around 1960, I believe. Jerry -- Engineering is the art of making what you want from things you can get. �����������������������������������������������������������������������
Reply by ●August 1, 20032003-08-01
"Jerry Avins" <jya@ieee.org> wrote in message news:3F2964A0.471AF151@ieee.org...> Glen Herrmannsfeldt wrote: > > > > "Clay S. Turner" <physicsNOOOOSPPPPAMMMM@bellsouth.net> wrote in message > > news:%i8Wa.15255$5O3.8866@fe03.atl2.webusenet.com... > > > > > > "Glen Herrmannsfeldt" <gah@ugcs.caltech.edu> wrote in message > > > news:b4zUa.135069$wk6.35585@rwcrnsc52.ops.asp.att.net... > > > > > > snip > > > > > > > > > > > (WWV has a transmitter with a 20KHz carrier trying to cover thewhole US> > > > with one transmitter. That is the lowest I know for a real radio > > > > transmission. It might even be FSK.) > > > > > > Hello Glen, et. al., > > > > > > The US Navy has a transmitter at 76Hz which offers worldwide coveragefor> > > its submarine fleet. > > > > I forgot about that one. > > > > We did have a submarine homework problem in an optics class once which > > needed the index of refraction of water at 15kHz. (It is about 9.)That> > may have been before the 76Hz transmitter.> That monster -- or at least experiments leading to it -- dated to around > 1960, I believe.The 15kHz submarine problem was about 1978. I don't know when it actually existed, if it did. (It was a homework problem, which may not represent a real system, though I thought it did.) -- glen
