6G really?...

[Jan Panteltje]

6G really?
https://www.globaltimes.cn/page/202201/1245197.shtml

<quote>
Adopting the photonic terahertz technology route,
that is generating terahertz signals through two higher-frequency lightwave beat frequencies,
a single-wavelength net rate of 103.125Gbps and a dual-wavelength net rate of 206.25Gbps
was achieved for the first time in real-time wireless transmission,
the laboratory said.
<end quote>

Why not just modulate the LED street lights?
?

 

[Jeff Layman]

On 06/01/2022 07:51, Jan Panteltje wrote:

6G really?
https://www.globaltimes.cn/page/202201/1245197.shtml

quote
Adopting the photonic terahertz technology route,
that is generating terahertz signals through two higher-frequency lightwave beat frequencies,
a single-wavelength net rate of 103.125Gbps and a dual-wavelength net rate of 206.25Gbps
was achieved for the first time in real-time wireless transmission,
the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...

--

Jeff

 

[John Doe]

Jan Panteltje wrote:

6G really?
https://www.globaltimes.cn/page/202201/1245197.shtml

quote
Adopting the photonic terahertz technology route, that is generating
terahertz signals through two higher-frequency lightwave beat
frequencies, a single-wavelength net rate of 103.125Gbps and a
dual-wavelength net rate of 206.25Gbps was achieved for the first time
in real-time wireless transmission, the laboratory said.
end quote

Why not just modulate the LED street lights? ?

No idea. My address now has 2 different gigabit Internet providers, AT&T
and Google, plus one sub gigabit Internet provider, Spectrum.

I do 99% of Internet access on a PC, little need for hyperspeed on a cell
phone. Zooming!!!

 

[Sylvia Else]

a single-wavelength net rate of 103.125Gbps and a dual-wavelength net rate of 206.25Gbps
was achieved for the first time in real-time wireless transmission,
the laboratory said.

You cannot send data on a single-wavelength. As soon as you modulate it
it is no longer a single-wavelength.

Sylvia.

 

[Jan Panteltje]

On a sunny day (Thu, 6 Jan 2022 21:55:49 +1100) it happened Sylvia Else
<sylvia@email.invalid> wrote in <j3o05lFofnfU1@mid.individual.net>:

a single-wavelength net rate of 103.125Gbps and a dual-wavelength net rate of 206.25Gbps
was achieved for the first time in real-time wireless transmission,
the laboratory said.

You cannot send data on a single-wavelength. As soon as you modulate it
it is no longer a single-wavelength.

Sylvia.

Right
but a few Gbps sidebands on such a high carrier would look like a narrow peak in the optical spectrum to the casual observer.

 

[Jan Panteltje]

On a sunny day (Thu, 6 Jan 2022 08:03:03 +0000) it happened Jeff Layman
<jmlayman@invalid.invalid> wrote in <sr67no$lh6$1@dont-email.me>:

On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
https://www.globaltimes.cn/page/202201/1245197.shtml

quote
Adopting the photonic terahertz technology route,
that is generating terahertz signals through two higher-frequency lightwave beat frequencies,
a single-wavelength net rate of 103.125Gbps and a dual-wavelength net rate of 206.25Gbps
was achieved for the first time in real-time wireless transmission,
the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on.

Leave those on.

Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

I was reading that \'meta\' VR just died..
https://arstechnica.com/gadgets/2022/01/report-meta-pulls-the-plug-on-its-ar-vr-operating-system-ambitions/?comments=1
I personally do not like all that crap hanging from my head, yes I have some 3D glasses.
..


>Is it 1 April already?...

English is April 1, so you are somewhere in Europe, ? Netherlands?

 

[Cursitor Doom]

On Thu, 06 Jan 2022 07:51:28 GMT, Jan Panteltje
<pNaonStpealmtje@yahoo.com> wrote:

6G really?
https://www.globaltimes.cn/page/202201/1245197.shtml

quote
Adopting the photonic terahertz technology route,
that is generating terahertz signals through two higher-frequency lightwave beat frequencies,
a single-wavelength net rate of 103.125Gbps and a dual-wavelength net rate of 206.25Gbps
was achieved for the first time in real-time wireless transmission,
the laboratory said.
end quote

Sounds like a great pitch for a high tech start-up scam.

 

[Jan Panteltje]

On a sunny day (Thu, 06 Jan 2022 12:54:46 +0000) it happened Cursitor Doom
<cd@notformail.com> wrote in <1jpdtgtd7sohtobj7iq84e60ga6j6ojjha@4ax.com>:

On Thu, 06 Jan 2022 07:51:28 GMT, Jan Panteltje
pNaonStpealmtje@yahoo.com> wrote:

6G really?
https://www.globaltimes.cn/page/202201/1245197.shtml

quote
Adopting the photonic terahertz technology route,
that is generating terahertz signals through two higher-frequency lightwave beat frequencies,
a single-wavelength net rate of 103.125Gbps and a dual-wavelength net rate of 206.25Gbps
was achieved for the first time in real-time wireless transmission,
the laboratory said.
end quote

Sounds like a great pitch for a high tech start-up scam.

It is China news, they are of course way ahead of US and Europe..
Idea seems reasonable to me.
Many years ago a German uni did something like that by modulating office lights.
No idea how the mix 2 light beams, maybe some crystal.

 

[Phil Hobbs]

Jeff Layman wrote:

On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...

Plus LEDs are way too slow.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Jan Panteltje]

On a sunny day (Thu, 6 Jan 2022 09:27:14 -0500) it happened Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote in
<7d528cc6-3843-3394-47d4-c70e88e4eacf@electrooptical.net>:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

https://en.wikipedia.org/wiki/Kerr_cell_shutter
nano nano

Would not surprize me if there are better modulators.


>

 

[server]

On Thu, 6 Jan 2022 09:27:14 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

Antennas are amazing ways to send data from place to place. I\'m
impressed that the tiny thing in my pocket will lock my car from 100
feet away, or that a cheap pizza-sized dish on our roof gives us
500+500 mbit internet service. No more phone booths.

6G sounds great. It could replace essentially everything else... ftth,
cable, TV antennas, phone lines, dishes, wifi, cat6, usb.



--

I yam what I yam - Popeye

 

[Phil Hobbs]

jlarkin@highlandsniptechnology.com wrote:

On Thu, 6 Jan 2022 09:27:14 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

Antennas are amazing ways to send data from place to place. I\'m
impressed that the tiny thing in my pocket will lock my car from 100
feet away, or that a cheap pizza-sized dish on our roof gives us
500+500 mbit internet service. No more phone booths.

6G sounds great. It could replace essentially everything else... ftth,
cable, TV antennas, phone lines, dishes, wifi, cat6, usb.

The problem is the wavelength, not so much the antenna. A single
electromagnetic mode (one that can be interrogated with a single pair of
wires) corresponds to an \'etendue of

lambda**2 / 2.

Etendue is the product of intercepted area and projected solid angle.
For a dipole, the projected solid angle is

Omega\' = 2 pi steradians.

So for a given intercepted area and angle, the number of modes goes up like

1/lambda ** 2.

Thus if you want a linear receiver (e.g. an RF antenna and receiver),
rather than not a square-law one (e.g. a photodiode) with an intercepted
area larger than

Amax = lambda **2 / ( 2 pi ),

you need either to make all the phases line up (e.g. with a dish or a
phased array), which reduces Omega\' by narrowing the beam), or else
multiple receivers.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[John Larkin]

On Thu, 6 Jan 2022 14:46:37 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 6 Jan 2022 09:27:14 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

Antennas are amazing ways to send data from place to place. I\'m
impressed that the tiny thing in my pocket will lock my car from 100
feet away, or that a cheap pizza-sized dish on our roof gives us
500+500 mbit internet service. No more phone booths.

6G sounds great. It could replace essentially everything else... ftth,
cable, TV antennas, phone lines, dishes, wifi, cat6, usb.

The problem is the wavelength, not so much the antenna. A single
electromagnetic mode (one that can be interrogated with a single pair of
wires) corresponds to an \'etendue of

lambda**2 / 2.

Etendue is the product of intercepted area and projected solid angle.
For a dipole, the projected solid angle is

Omega\' = 2 pi steradians.

So for a given intercepted area and angle, the number of modes goes up like

1/lambda ** 2.

Thus if you want a linear receiver (e.g. an RF antenna and receiver),
rather than not a square-law one (e.g. a photodiode) with an intercepted
area larger than

Amax = lambda **2 / ( 2 pi ),

you need either to make all the phases line up (e.g. with a dish or a
phased array), which reduces Omega\' by narrowing the beam), or else
multiple receivers.

Cheers

Phil Hobbs

My cell phone always works, even in my back pocket. Our wifi works
anywhere in the house. The ultimate 9G or whatever would have a lot of
small nodes out on telephone poles, with a lot of smarts. Zones would
be small and overlap. Frequencies would hop as needed.

If some multi-GHz signal doesn\'t make it into your basement, go to
Walgreens and buy a repeater for $9.95.

We\'re still in the dark ages with tangles of wires and dishes and
people trenching sidewalks to run fiber.



--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

 

[Joe Gwinn]

On Thu, 06 Jan 2022 12:59:00 -0800, John Larkin
<jlarkin@highland_atwork_technology.com> wrote:

On Thu, 6 Jan 2022 14:46:37 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 6 Jan 2022 09:27:14 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

Antennas are amazing ways to send data from place to place. I\'m
impressed that the tiny thing in my pocket will lock my car from 100
feet away, or that a cheap pizza-sized dish on our roof gives us
500+500 mbit internet service. No more phone booths.

6G sounds great. It could replace essentially everything else... ftth,
cable, TV antennas, phone lines, dishes, wifi, cat6, usb.

The problem is the wavelength, not so much the antenna. A single
electromagnetic mode (one that can be interrogated with a single pair of
wires) corresponds to an \'etendue of

lambda**2 / 2.

Etendue is the product of intercepted area and projected solid angle.
For a dipole, the projected solid angle is

Omega\' = 2 pi steradians.

So for a given intercepted area and angle, the number of modes goes up like

1/lambda ** 2.

Thus if you want a linear receiver (e.g. an RF antenna and receiver),
rather than not a square-law one (e.g. a photodiode) with an intercepted
area larger than

Amax = lambda **2 / ( 2 pi ),

you need either to make all the phases line up (e.g. with a dish or a
phased array), which reduces Omega\' by narrowing the beam), or else
multiple receivers.

Cheers

Phil Hobbs

My cell phone always works, even in my back pocket. Our wifi works
anywhere in the house. The ultimate 9G or whatever would have a lot of
small nodes out on telephone poles, with a lot of smarts. Zones would
be small and overlap. Frequencies would hop as needed.

If some multi-GHz signal doesn\'t make it into your basement, go to
Walgreens and buy a repeater for $9.95.

In the urban areas, yes. In rural areas, not so much, as always. Too
few telephone poles. Also too low a population density to make the
economics work.

We\'re still in the dark ages with tangles of wires and dishes and
people trenching sidewalks to run fiber.

There will still be power and fibers going to the base stations on
telephone poles. Millimeter wave beams don\'t go all that far, even if
the buildings and trees didn\'t get in the way.

Joe Gwinn

 

[Phil Hobbs]

John Larkin wrote:

On Thu, 6 Jan 2022 14:46:37 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 6 Jan 2022 09:27:14 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

Antennas are amazing ways to send data from place to place. I\'m
impressed that the tiny thing in my pocket will lock my car from 100
feet away, or that a cheap pizza-sized dish on our roof gives us
500+500 mbit internet service. No more phone booths.

6G sounds great. It could replace essentially everything else... ftth,
cable, TV antennas, phone lines, dishes, wifi, cat6, usb.

The problem is the wavelength, not so much the antenna. A single
electromagnetic mode (one that can be interrogated with a single pair of
wires) corresponds to an \'etendue of

lambda**2 / 2.

Etendue is the product of intercepted area and projected solid angle.
For a dipole, the projected solid angle is

Omega\' = 2 pi steradians.

So for a given intercepted area and angle, the number of modes goes up like

1/lambda ** 2.

Thus if you want a linear receiver (e.g. an RF antenna and receiver),
rather than not a square-law one (e.g. a photodiode) with an intercepted
area larger than

Amax = lambda **2 / ( 2 pi ),

you need either to make all the phases line up (e.g. with a dish or a
phased array), which reduces Omega\' by narrowing the beam), or else
multiple receivers.

Cheers

Phil Hobbs

My cell phone always works, even in my back pocket. Our wifi works
anywhere in the house. The ultimate 9G or whatever would have a lot of
small nodes out on telephone poles, with a lot of smarts. Zones would
be small and overlap. Frequencies would hop as needed.

If some multi-GHz signal doesn\'t make it into your basement, go to
Walgreens and buy a repeater for $9.95.

We\'re still in the dark ages with tangles of wires and dishes and
people trenching sidewalks to run fiber.

I don\'t agree--RF works less well as you go up in frequency, even with
100% perfect parts.

Semiconductors stop being semiconductors around 1 THz, because the
plasma frequency is too low to allow for collective motions of electrons.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[John Larkin]

On Thu, 6 Jan 2022 18:05:50 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

John Larkin wrote:
On Thu, 6 Jan 2022 14:46:37 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 6 Jan 2022 09:27:14 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

Antennas are amazing ways to send data from place to place. I\'m
impressed that the tiny thing in my pocket will lock my car from 100
feet away, or that a cheap pizza-sized dish on our roof gives us
500+500 mbit internet service. No more phone booths.

6G sounds great. It could replace essentially everything else... ftth,
cable, TV antennas, phone lines, dishes, wifi, cat6, usb.

The problem is the wavelength, not so much the antenna. A single
electromagnetic mode (one that can be interrogated with a single pair of
wires) corresponds to an \'etendue of

lambda**2 / 2.

Etendue is the product of intercepted area and projected solid angle.
For a dipole, the projected solid angle is

Omega\' = 2 pi steradians.

So for a given intercepted area and angle, the number of modes goes up like

1/lambda ** 2.

Thus if you want a linear receiver (e.g. an RF antenna and receiver),
rather than not a square-law one (e.g. a photodiode) with an intercepted
area larger than

Amax = lambda **2 / ( 2 pi ),

you need either to make all the phases line up (e.g. with a dish or a
phased array), which reduces Omega\' by narrowing the beam), or else
multiple receivers.

Cheers

Phil Hobbs

My cell phone always works, even in my back pocket. Our wifi works
anywhere in the house. The ultimate 9G or whatever would have a lot of
small nodes out on telephone poles, with a lot of smarts. Zones would
be small and overlap. Frequencies would hop as needed.

If some multi-GHz signal doesn\'t make it into your basement, go to
Walgreens and buy a repeater for $9.95.

We\'re still in the dark ages with tangles of wires and dishes and
people trenching sidewalks to run fiber.

I don\'t agree--RF works less well as you go up in frequency, even with
100% perfect parts.

Short range is a virtue in a microcell system.

Semiconductors stop being semiconductors around 1 THz, because the
plasma frequency is too low to allow for collective motions of electrons.

We don\'t need THz cells for Facebook and Netflix. It would be nice to
have a single network in place of the mess we have now.

Mess includes the tangles of hubs and cables under my desk.

--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

 

[John Larkin]

On Thu, 06 Jan 2022 17:49:25 -0500, Joe Gwinn <joegwinn@comcast.net>
wrote:

On Thu, 06 Jan 2022 12:59:00 -0800, John Larkin
jlarkin@highland_atwork_technology.com> wrote:

On Thu, 6 Jan 2022 14:46:37 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 6 Jan 2022 09:27:14 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

Antennas are amazing ways to send data from place to place. I\'m
impressed that the tiny thing in my pocket will lock my car from 100
feet away, or that a cheap pizza-sized dish on our roof gives us
500+500 mbit internet service. No more phone booths.

6G sounds great. It could replace essentially everything else... ftth,
cable, TV antennas, phone lines, dishes, wifi, cat6, usb.

The problem is the wavelength, not so much the antenna. A single
electromagnetic mode (one that can be interrogated with a single pair of
wires) corresponds to an \'etendue of

lambda**2 / 2.

Etendue is the product of intercepted area and projected solid angle.
For a dipole, the projected solid angle is

Omega\' = 2 pi steradians.

So for a given intercepted area and angle, the number of modes goes up like

1/lambda ** 2.

Thus if you want a linear receiver (e.g. an RF antenna and receiver),
rather than not a square-law one (e.g. a photodiode) with an intercepted
area larger than

Amax = lambda **2 / ( 2 pi ),

you need either to make all the phases line up (e.g. with a dish or a
phased array), which reduces Omega\' by narrowing the beam), or else
multiple receivers.

Cheers

Phil Hobbs

My cell phone always works, even in my back pocket. Our wifi works
anywhere in the house. The ultimate 9G or whatever would have a lot of
small nodes out on telephone poles, with a lot of smarts. Zones would
be small and overlap. Frequencies would hop as needed.

If some multi-GHz signal doesn\'t make it into your basement, go to
Walgreens and buy a repeater for $9.95.

In the urban areas, yes. In rural areas, not so much, as always. Too
few telephone poles. Also too low a population density to make the
economics work.

A single rural user or a small town of course needs some connection to
the outside world, but it could then be 9G for local distribution.

Mass produced, the pole-top nodes would be dirt cheap... like
microwave links have become.

We\'re still in the dark ages with tangles of wires and dishes and
people trenching sidewalks to run fiber.

There will still be power and fibers going to the base stations on
telephone poles. Millimeter wave beams don\'t go all that far, even if
the buildings and trees didn\'t get in the way.

Power for sure, but that\'s there. An area covered by micronodes would
only need an occasional fiber or microwave connection to the world;
nodes can talk to one another.

There used to be many not-interconnected telephone companies each with
their own tangles of wires. A \"Long Distance\" call used to be a big
expensive event. That\'s about where we are now.

--

If a man will begin with certainties, he shall end with doubts,
but if he will be content to begin with doubts he shall end in certainties.
Francis Bacon

 

[Anthony William Sloman]

On Thursday, January 6, 2022 at 10:39:46 PM UTC+11, Jan Panteltje wrote:

On a sunny day (Thu, 6 Jan 2022 08:03:03 +0000) it happened Jeff Layman
jmla...@invalid.invalid> wrote in <sr67no$lh6$1...@dont-email.me>:
On 06/01/2022 07:51, Jan Panteltje wrote:

<snip>

Is it 1 April already?...
English is April 1, so you are somewhere in Europe, ? Netherlands?

The English (and Australians) write 1st April. Americans write April 1.

I think Jeff Layman is English, but he might be lazy.

--
Bill Sloman, Sydney

 

[Jan Panteltje]

On a sunny day (Thu, 6 Jan 2022 19:49:24 -0800 (PST)) it happened Anthony
William Sloman <bill.sloman@ieee.org> wrote in
<8766e206-47a5-44a1-be60-79842717517cn@googlegroups.com>:

On Thursday, January 6, 2022 at 10:39:46 PM UTC+11, Jan Panteltje wrote:
On a sunny day (Thu, 6 Jan 2022 08:03:03 +0000) it happened Jeff Layman
jmla...@invalid.invalid> wrote in <sr67no$lh6$1...@dont-email.me>:
On 06/01/2022 07:51, Jan Panteltje wrote:

snip

Is it 1 April already?...
English is April 1, so you are somewhere in Europe, ? Netherlands?

The English (and Australians) write 1st April. Americans write April 1.

I think Jeff Layman is English, but he might be lazy.

Sure but \'een april\' (1 April) is Dutch (used as reply to the joke).
But OK, was just an idea.

 

[Jan Panteltje]

On a sunny day (Thu, 06 Jan 2022 12:59:00 -0800) it happened John Larkin
<jlarkin@highland_atwork_technology.com> wrote in
<ufletg9nttaajc28gc2mnjga5mglduvkd6@4ax.com>:

On Thu, 6 Jan 2022 14:46:37 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

jlarkin@highlandsniptechnology.com wrote:
On Thu, 6 Jan 2022 09:27:14 -0500, Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote:

Jeff Layman wrote:
On 06/01/2022 07:51, Jan Panteltje wrote:
6G really?
  https://www.globaltimes.cn/page/202201/1245197.shtml

quote
  Adopting the photonic terahertz technology route,
  that is generating terahertz signals through two higher-frequency
lightwave beat frequencies,
  a single-wavelength net rate of 103.125Gbps and a dual-wavelength
net rate of 206.25Gbps
  was achieved for the first time in real-time wireless transmission,
  the laboratory said.
end quote

Why not just modulate the LED street lights?
?

Good idea. Of course, that limits the use to night only when the lights
are on. Wait a minute - we could have IR leds for street lights which
would be on all the time and everybody gets IR-sensitive nightvision
glasses for use when it\'s dark. Problem solved!

Is it 1 April already?...


Plus LEDs are way too slow.

Antennas are amazing ways to send data from place to place. I\'m
impressed that the tiny thing in my pocket will lock my car from 100
feet away, or that a cheap pizza-sized dish on our roof gives us
500+500 mbit internet service. No more phone booths.

6G sounds great. It could replace essentially everything else... ftth,
cable, TV antennas, phone lines, dishes, wifi, cat6, usb.

The problem is the wavelength, not so much the antenna. A single
electromagnetic mode (one that can be interrogated with a single pair of
wires) corresponds to an \'etendue of

lambda**2 / 2.

Etendue is the product of intercepted area and projected solid angle.
For a dipole, the projected solid angle is

Omega\' = 2 pi steradians.

So for a given intercepted area and angle, the number of modes goes up like

1/lambda ** 2.

Thus if you want a linear receiver (e.g. an RF antenna and receiver),
rather than not a square-law one (e.g. a photodiode) with an intercepted
area larger than

Amax = lambda **2 / ( 2 pi ),

you need either to make all the phases line up (e.g. with a dish or a
phased array), which reduces Omega\' by narrowing the beam), or else
multiple receivers.

Cheers

Phil Hobbs

My cell phone always works, even in my back pocket. Our wifi works
anywhere in the house. The ultimate 9G or whatever would have a lot of
small nodes out on telephone poles, with a lot of smarts. Zones would
be small and overlap. Frequencies would hop as needed.

If some multi-GHz signal doesn\'t make it into your basement, go to
Walgreens and buy a repeater for $9.95.

We\'re still in the dark ages with tangles of wires and dishes and
people trenching sidewalks to run fiber.

I have a 4G USB stick in a raspberry pi at home here, connected to the LAM,
enough data for me for youtube videos and papers and usenet and
maintain my website and email.
I can take the 4G stick and put it in the laptop and have same internet anywhere.
Most TV etc from a satellite dish, almost 1000 free channels.
Have several phones each with prepayed cards that can do internet too.
I wonder why people need terabytes of lightspeed datastreams (upload big selfies???)
?
Its a hype!
Recently there was a big fight about 5G interfering with aircraft altimeters,
airlines threatened to cancel thousands of flights due to safety problems,
now the providers will keep 5G out of the airfield areas,

No 5G in the airport on your phone