HF frequencies wouldn't even work for 1/2G.You sure Sprint and AT&T won't use that spectrum for 6G, 7G, whatever comes next?
HF frequencies wouldn't even work for 1/2G.You sure Sprint and AT&T won't use that spectrum for 6G, 7G, whatever comes next?
And it skips. And propagation changes at different times of the day and year. Stable and predictable propagation are essential for point-to-point or mobile usage.What? SW for cellular PCS??? No, it's way to small and noisy.
That project ended years ago. The University of Alaska Fairbanks now operates the facility in a much different capacity than USAF/DOD. I've actually been there.The Air Force has used shortwave to blast megawatts of power into the ionosphere to create aurora in Alaska, with the help of the "Internet is a series of tubes" guy:
Totally yes, and much more available bandwidth to transfer much more data.Isn't Fiber faster for data transfer?
I worked with fiber-optic devices that had a bandwidth of 3 GHz 30 years ago. Not cheap, but they worked.Totally yes, and much more available bandwidth to transfer much more data.
Better than 1200 baud, wouldn't you say?I worked with fiber-optic devices that had a bandwidth of 3 GHz 30 years ago. Not cheap, but they worked.
I was going to say, "nothing is worse than 1200 baud" but then I remembered my first modem was only a fraction of that!Better than 1200 baud, wouldn't you say?
The difference is: This would likely be slower.How would any of this be different from Bloomberg Terminal, which has existed for around 40 years? They might as well use carrier pigeons to transmit the orders.
300 baud with a place on top of the box to put the phone handset?I was going to say, "nothing is worse than 1200 baud" but then I remembered my first modem was only a fraction of that!
Bloomberg Terminal these days uses standard TCP/IP protocols (and probably some UDP in there too; I don't remember specifics).How would any of this be different from Bloomberg Terminal, which has existed for around 40 years? They might as well use carrier pigeons to transmit the orders.
Early 1980s: AP teletypes ran at 150. UPI could go up to 180 if you had an Exel dot-matrix printer.I was going to say, "nothing is worse than 1200 baud" but then I remembered my first modem was only a fraction of that!
I vaguely recall there was a stock information service in the 1980s that used FM subcarriers…I think it was called QuoTrader. I had the impression at the time it was data that would be fed into some sort of computer terminal. Can’t find anything about it now, probably different than the service the receiver in the video used.Back in the early '80s, Dow Jones used FM subcarriers to transmit stock information to subscribers. Years ago I found one of the receivers and made a video about it:
Sprint won’t be using any spectrum now or in the future because Sprint no longer exists.You sure Sprint and AT&T won't use that spectrum for 6G, 7G, whatever comes next?
That was fast for radioteletype, which also used much slower rates. You would have to change the gears in the teletype machine for each speed, as well as adjust the receiver and demodulator.Early 1980s: AP teletypes ran at 150. UPI could go up to 180 if you had an Exel dot-matrix printer.
SCA is pretty much extinct nowadays, isn't it?I’ve used SCA demodulators in the past to explore what kind of services were offered
Pretty much so. I haven’t checked in many years but I should dig out my old SCA receiver setup and see if anything is left here in Houston. I think KUHF might still have the reading service for the blind on a 67 kHz subcarrier (they also currently have that on their HD-4) but I would guess everything else is long gone.SCA is pretty much extinct nowadays, isn't it?