• Laser communicatiion in space

    From Jan Panteltje@21:1/5 to All on Sun Dec 31 05:49:41 2023
    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to All on Sun Dec 31 08:17:20 2023
    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are
    doing optical satellite comm for a lot less.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Cursitor Doom@21:1/5 to All on Sun Dec 31 17:35:22 2023
    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    Good call. Laser modulated transmissions can't be intercepted by a
    third party without being detected.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Cursitor Doom@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Sun Dec 31 18:38:40 2023
    On Sun, 31 Dec 2023 18:28:47 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    Cursitor Doom <cd@notformail.com> wrote:
    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    Good call. Laser modulated transmissions can't be intercepted by a
    third party without being detected.


    You’re confusing free-space laser with fiber optics. In fiber you collect
    all the light, so you can tell if some gets tapped off. You can also see >exactly where it happens by using OTDR.

    In long range free space, most of the light misses the detector anyway, and >there isn’t any way to see where it went.

    Fair point. Even lasers suffer from beam divergence. I stand
    corrected, Phil!

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to Cursitor Doom on Sun Dec 31 18:28:47 2023
    Cursitor Doom <cd@notformail.com> wrote:
    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    Good call. Laser modulated transmissions can't be intercepted by a
    third party without being detected.


    You’re confusing free-space laser with fiber optics. In fiber you collect
    all the light, so you can tell if some gets tapped off. You can also see exactly where it happens by using OTDR.

    In long range free space, most of the light misses the detector anyway, and there isn’t any way to see where it went.

    Cheers

    Phil Hobbs

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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jeff Liebermann@21:1/5 to All on Sun Dec 31 11:19:00 2023
    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    Perhaps NASA should just give the project and the money to SpaceX,
    which already has a working space laser mesh communications system.

    "SpaceX Reveals Operation of Over 8,000 'Space Lasers' Across Starlink Satellite Constellation - Enabling Faster Internet" (Sep 26, 2023) <https://www.tesmanian.com/blogs/tesmanian-blog/starlink-video>

    Cute cat.

    --
    Jeff Liebermann jeffl@cruzio.com
    PO Box 272 http://www.LearnByDestroying.com
    Ben Lomond CA 95005-0272
    Skype: JeffLiebermann AE6KS 831-336-2558

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to jl@997PotHill.com on Mon Jan 1 05:56:59 2024
    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin <jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are
    doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to cd@notformail.com on Mon Jan 1 05:58:40 2024
    On a sunny day (Sun, 31 Dec 2023 17:35:22 +0000) it happened Cursitor Doom <cd@notformail.com> wrote in <jg93pi5tb5b7hs09e9uhlcltvf6p6o3cm7@4ax.com>:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    Good call. Laser modulated transmissions can't be intercepted by a
    third party without being detected.

    Beam is wide enough for a second receiver station.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to All on Mon Jan 1 08:21:21 2024
    On Mon, 01 Jan 2024 05:56:59 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin ><jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are
    doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    The folks that I know are doing LEO cubestats, cube to cube comm.

    There are, for some odd reason, two cubesat companies within walking
    distance of my office. Cubeville CA.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to jl@997PotHill.com on Tue Jan 2 06:17:02 2024
    On a sunny day (Mon, 01 Jan 2024 08:21:21 -0800) it happened John Larkin <jl@997PotHill.com> wrote in <ddp5pid6em18b40pqoh8ph81mg588h7sqa@4ax.com>:

    On Mon, 01 Jan 2024 05:56:59 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin >><jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>>wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are
    doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    The folks that I know are doing LEO cubesats, cube to cube comm.

    There are, for some odd reason, two cubesat companies within walking
    distance of my office. Cubeville CA.

    I see you are offending other google using posters.. Drinking problem?
    cubesats round the earth at low altitude.
    Laser commi-nuka (sorry that was Reagan) communication to space was already used by the French years ago, 2001 ESA:
    https://www.esa.int/Applications/Connectivity_and_Secure_Communications/A_world_first_Data_transmission_between_European_satellites_using_laser_light

    You do not read! the article is about very long distance data transmission with lasers.
    It is a NASA project
    700 million is nothing compared to the money burned by the loss making US Military Industrial Complex
    payed for by your taxes and even then creating an ever greater US debt and ever more US enemies, killing thousands,
    eroding the dollar use (now below 60 percent of world wide used currency).

    And we actually discussed the subject before, you did not know back then that a laser beam diverges.
    That was just a few month ago.

    So cool it man!

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to All on Tue Jan 2 08:32:56 2024
    On Tue, 02 Jan 2024 06:17:02 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Mon, 01 Jan 2024 08:21:21 -0800) it happened John Larkin ><jl@997PotHill.com> wrote in <ddp5pid6em18b40pqoh8ph81mg588h7sqa@4ax.com>:

    On Mon, 01 Jan 2024 05:56:59 GMT, Jan Panteltje <alien@comet.invalid> >>wrote:

    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin >>><jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>: >>>
    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>>>wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are >>>>doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    The folks that I know are doing LEO cubesats, cube to cube comm.

    There are, for some odd reason, two cubesat companies within walking >>distance of my office. Cubeville CA.

    I see you are offending other google using posters..

    Did my paragraphs above offend you? Why?

    Drinking problem?

    When Mo and I are in a wild mood, we split a beer.

    cubesats round the earth at low altitude.

    Did I mention "LEO" ?



    Laser commi-nuka (sorry that was Reagan) communication to space was already used by the French years ago, 2001 ESA:
    https://www.esa.int/Applications/Connectivity_and_Secure_Communications/A_world_first_Data_transmission_between_European_satellites_using_laser_light

    You do not read! the article is about very long distance data transmission with lasers.
    It is a NASA project
    700 million is nothing compared to the money burned by the loss making US Military Industrial Complex
    payed for by your taxes and even then creating an ever greater US debt and ever more US enemies, killing thousands,
    eroding the dollar use (now below 60 percent of world wide used currency).

    And we actually discussed the subject before, you did not know back then that a laser beam diverges.

    Except that I compared the divergence if a laser with that of a
    microwave antenna. With numbers.

    That was just a few month ago.

    So cool it man!

    Famous quote: "Don't be a jerk Mervin. Nobody likes jerks."

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jan Panteltje@21:1/5 to jl@997PotHill.com on Wed Jan 3 06:43:37 2024
    On a sunny day (Tue, 02 Jan 2024 08:32:56 -0800) it happened John Larkin <jl@997PotHill.com> wrote in <ctd8pilgi7p9tu5vkb3q4hr32j1b08g751@4ax.com>:

    On Tue, 02 Jan 2024 06:17:02 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Mon, 01 Jan 2024 08:21:21 -0800) it happened John Larkin >><jl@997PotHill.com> wrote in <ddp5pid6em18b40pqoh8ph81mg588h7sqa@4ax.com>:

    On Mon, 01 Jan 2024 05:56:59 GMT, Jan Panteltje <alien@comet.invalid> >>>wrote:

    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin >>>><jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>: >>>>
    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>>>>wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are >>>>>doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    The folks that I know are doing LEO cubesats, cube to cube comm.

    There are, for some odd reason, two cubesat companies within walking >>>distance of my office. Cubeville CA.

    I see you are offending other google using posters..

    Did my paragraphs above offend you? Why?

    Drinking problem?

    When Mo and I are in a wild mood, we split a beer.

    cubesats round the earth at low altitude.

    Did I mention "LEO" ?



    Laser commi-nuka (sorry that was Reagan) communication to space was already used by the French years ago, 2001 ESA:

    https://www.esa.int/Applications/Connectivity_and_Secure_Communications/A_world_first_Data_transmission_between_European_satellites_using_laser_light

    You do not read! the article is about very long distance data transmission with lasers.
    It is a NASA project
    700 million is nothing compared to the money burned by the loss making US Military Industrial Complex
    payed for by your taxes and even then creating an ever greater US debt and ever more US enemies, killing thousands,
    eroding the dollar use (now below 60 percent of world wide used currency).

    And we actually discussed the subject before, you did not know back then that a laser beam diverges.

    Except that I compared the divergence if a laser with that of a
    microwave antenna. With numbers.

    That was just a few month ago.

    So cool it man!

    Famous quote: "Don't be a jerk Mervin. Nobody likes jerks."

    Well you contribution to the newsgroup are not that good
    showing off 2k dollar giggle hertz scopes may be help sell?
    Using things out of spec... all the time?

    As to that 'security', when one laser hits an other cubesat, the beam is usualy a bit wider than the receiver's opening,
    so part will reflect off, light that area of the usually shiny material the cube is made off.
    Attacker just points a telescope from his own cubesat in space to that light and listens in.
    Could even work from earth if skies are clear.
    NOTHING is ever 100% secure,.
    I was thinking just hack Hubble or Webb and have it point at the millions miles (or km if you wish) far away thing..
    hacking those things is likely easy.

    I am considering leaving Usenet (many happy now) since when was it? Win 3.1? Anybody can visit https://panteltje.online if interested in projects I did.

    Too many insults and bull here, like that CERN guy talking about creeps
    A creep is an animal that possible lives in holes underground, like CERN people live in tunnels
    are religious fanatics parroting Albert OneStone's hay is em see squared and think that by shooting Teslas
    at close to light speed they will find out the programming of auto pilot and the inner construction of its chips
    An other silly project looking for the 'god' particle
    a dropping place for mamaticians where they do a divide by zero and lose grab of reality
    then do re-normalization to come up with idiot things like holographic universes and string theory.
    CERN even detected faster than light .. pity they did not know how their own equipment worked.
    The creeps are sucking taxpayer money, keep people stupid,
    use so much energy that the planet heats up incredibly fast and for more then 70 years now? have produced absolutely nothing useful.
    Same as that laser fussion or was it fuzzy project you supply equipment to, and sane as ITER.
    Always things need to be 'just a little bit bigger' and more money is needed. Bomb shelters is likely best use of CERN.
    So here my views, others working for the US mil complex never posting anything useful.
    F35 sucks and is a noisy pest.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to All on Wed Jan 3 07:37:28 2024
    On Wed, 03 Jan 2024 06:43:37 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Tue, 02 Jan 2024 08:32:56 -0800) it happened John Larkin ><jl@997PotHill.com> wrote in <ctd8pilgi7p9tu5vkb3q4hr32j1b08g751@4ax.com>:

    On Tue, 02 Jan 2024 06:17:02 GMT, Jan Panteltje <alien@comet.invalid> >>wrote:

    On a sunny day (Mon, 01 Jan 2024 08:21:21 -0800) it happened John Larkin >>><jl@997PotHill.com> wrote in <ddp5pid6em18b40pqoh8ph81mg588h7sqa@4ax.com>: >>>
    On Mon, 01 Jan 2024 05:56:59 GMT, Jan Panteltje <alien@comet.invalid> >>>>wrote:

    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin >>>>><jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>: >>>>>
    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>>>>>wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are >>>>>>doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    The folks that I know are doing LEO cubesats, cube to cube comm.

    There are, for some odd reason, two cubesat companies within walking >>>>distance of my office. Cubeville CA.

    I see you are offending other google using posters..

    Did my paragraphs above offend you? Why?

    Drinking problem?

    When Mo and I are in a wild mood, we split a beer.

    cubesats round the earth at low altitude.

    Did I mention "LEO" ?



    Laser commi-nuka (sorry that was Reagan) communication to space was already used by the French years ago, 2001 ESA:

    https://www.esa.int/Applications/Connectivity_and_Secure_Communications/A_world_first_Data_transmission_between_European_satellites_using_laser_light

    You do not read! the article is about very long distance data transmission with lasers.
    It is a NASA project
    700 million is nothing compared to the money burned by the loss making US Military Industrial Complex
    payed for by your taxes and even then creating an ever greater US debt and ever more US enemies, killing thousands,
    eroding the dollar use (now below 60 percent of world wide used currency). >>>
    And we actually discussed the subject before, you did not know back then that a laser beam diverges.

    Except that I compared the divergence if a laser with that of a
    microwave antenna. With numbers.

    That was just a few month ago.

    So cool it man!

    Famous quote: "Don't be a jerk Mervin. Nobody likes jerks."

    Well you contribution to the newsgroup are not that good
    showing off 2k dollar giggle hertz scopes may be help sell?

    We have a $60K LeCroy too. It has a 1ps RMS jitter floor.

    If you plan to do serious fast stuff, a decent scope is necessary, and
    fast scopes keep getting cheaper. Heck, you can get an old Tek
    sampler, 30 GHz with TDR, for ballpark $600. New color digital scopes
    cost about a dollar per MHz.

    Using things out of spec... all the time?

    Only when there is a big performance payoff, and parts have been
    tested enough to estimate the safety margin. The real problem with
    specs is that one often doesn't get them, especially for RF parts.


    As to that 'security', when one laser hits an other cubesat, the beam is usualy a bit wider than the receiver's opening,
    so part will reflect off, light that area of the usually shiny material the cube is made off.
    Attacker just points a telescope from his own cubesat in space to that light and listens in.

    The time of intercept will be seconds. That won't gather enough data
    to break even modest encryption.

    It's a lot more secure than spraying RF all over space.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Phil Hobbs@21:1/5 to John Larkin on Wed Jan 3 17:06:21 2024
    John Larkin <jl@997PotHill.com> wrote:
    On Wed, 03 Jan 2024 06:43:37 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Tue, 02 Jan 2024 08:32:56 -0800) it happened John Larkin
    <jl@997PotHill.com> wrote in <ctd8pilgi7p9tu5vkb3q4hr32j1b08g751@4ax.com>: >>
    On Tue, 02 Jan 2024 06:17:02 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Mon, 01 Jan 2024 08:21:21 -0800) it happened John Larkin >>>> <jl@997PotHill.com> wrote in <ddp5pid6em18b40pqoh8ph81mg588h7sqa@4ax.com>: >>>>
    On Mon, 01 Jan 2024 05:56:59 GMT, Jan Panteltje <alien@comet.invalid> >>>>> wrote:

    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin >>>>>> <jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>>>>>> wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are >>>>>>> doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    The folks that I know are doing LEO cubesats, cube to cube comm.

    There are, for some odd reason, two cubesat companies within walking >>>>> distance of my office. Cubeville CA.

    I see you are offending other google using posters..

    Did my paragraphs above offend you? Why?

    Drinking problem?

    When Mo and I are in a wild mood, we split a beer.

    cubesats round the earth at low altitude.

    Did I mention "LEO" ?



    Laser commi-nuka (sorry that was Reagan) communication to space was
    already used by the French years ago, 2001 ESA:

    https://www.esa.int/Applications/Connectivity_and_Secure_Communications/A_world_first_Data_transmission_between_European_satellites_using_laser_light

    You do not read! the article is about very long distance data transmission with lasers.
    It is a NASA project
    700 million is nothing compared to the money burned by the loss making >>>> US Military Industrial Complex
    payed for by your taxes and even then creating an ever greater US debt >>>> and ever more US enemies, killing thousands,
    eroding the dollar use (now below 60 percent of world wide used currency). >>>>
    And we actually discussed the subject before, you did not know back
    then that a laser beam diverges.

    Except that I compared the divergence if a laser with that of a
    microwave antenna. With numbers.

    That was just a few month ago.

    So cool it man!

    Famous quote: "Don't be a jerk Mervin. Nobody likes jerks."

    Well you contribution to the newsgroup are not that good
    showing off 2k dollar giggle hertz scopes may be help sell?

    We have a $60K LeCroy too. It has a 1ps RMS jitter floor.

    If you plan to do serious fast stuff, a decent scope is necessary, and
    fast scopes keep getting cheaper. Heck, you can get an old Tek
    sampler, 30 GHz with TDR, for ballpark $600. New color digital scopes
    cost about a dollar per MHz.

    Using things out of spec... all the time?

    Only when there is a big performance payoff, and parts have been
    tested enough to estimate the safety margin. The real problem with
    specs is that one often doesn't get them, especially for RF parts.


    As to that 'security', when one laser hits an other cubesat, the beam is
    usualy a bit wider than the receiver's opening,
    so part will reflect off, light that area of the usually shiny material
    the cube is made off.
    Attacker just points a telescope from his own cubesat in space to that
    light and listens in.

    The time of intercept will be seconds. That won't gather enough data
    to break even modest encryption.

    It's a lot more secure than spraying RF all over space.



    Eavesdropping on optical communications in orbit is doomed by the photon statistics. An ideal receiver gets a SNR of N/2B, where N is the photon detection rate and B is the bandwidth.

    (I expect that the Flying Dutchman has been hanging around SED too much,
    and so has forgotten what SNR is. ) ;)

    Cheers

    Phil Hobbs

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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Larkin@21:1/5 to pcdhSpamMeSenseless@electrooptical. on Wed Jan 3 09:36:12 2024
    On Wed, 3 Jan 2024 17:06:21 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

    John Larkin <jl@997PotHill.com> wrote:
    On Wed, 03 Jan 2024 06:43:37 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Tue, 02 Jan 2024 08:32:56 -0800) it happened John Larkin >>> <jl@997PotHill.com> wrote in <ctd8pilgi7p9tu5vkb3q4hr32j1b08g751@4ax.com>: >>>
    On Tue, 02 Jan 2024 06:17:02 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Mon, 01 Jan 2024 08:21:21 -0800) it happened John Larkin >>>>> <jl@997PotHill.com> wrote in <ddp5pid6em18b40pqoh8ph81mg588h7sqa@4ax.com>:

    On Mon, 01 Jan 2024 05:56:59 GMT, Jan Panteltje <alien@comet.invalid> >>>>>> wrote:

    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin
    <jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>>>>>>> wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are >>>>>>>> doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    The folks that I know are doing LEO cubesats, cube to cube comm.

    There are, for some odd reason, two cubesat companies within walking >>>>>> distance of my office. Cubeville CA.

    I see you are offending other google using posters..

    Did my paragraphs above offend you? Why?

    Drinking problem?

    When Mo and I are in a wild mood, we split a beer.

    cubesats round the earth at low altitude.

    Did I mention "LEO" ?



    Laser commi-nuka (sorry that was Reagan) communication to space was
    already used by the French years ago, 2001 ESA:

    https://www.esa.int/Applications/Connectivity_and_Secure_Communications/A_world_first_Data_transmission_between_European_satellites_using_laser_light

    You do not read! the article is about very long distance data transmission with lasers.
    It is a NASA project
    700 million is nothing compared to the money burned by the loss making >>>>> US Military Industrial Complex
    payed for by your taxes and even then creating an ever greater US debt >>>>> and ever more US enemies, killing thousands,
    eroding the dollar use (now below 60 percent of world wide used currency).

    And we actually discussed the subject before, you did not know back
    then that a laser beam diverges.

    Except that I compared the divergence if a laser with that of a
    microwave antenna. With numbers.

    That was just a few month ago.

    So cool it man!

    Famous quote: "Don't be a jerk Mervin. Nobody likes jerks."

    Well you contribution to the newsgroup are not that good
    showing off 2k dollar giggle hertz scopes may be help sell?

    We have a $60K LeCroy too. It has a 1ps RMS jitter floor.

    If you plan to do serious fast stuff, a decent scope is necessary, and
    fast scopes keep getting cheaper. Heck, you can get an old Tek
    sampler, 30 GHz with TDR, for ballpark $600. New color digital scopes
    cost about a dollar per MHz.

    Using things out of spec... all the time?

    Only when there is a big performance payoff, and parts have been
    tested enough to estimate the safety margin. The real problem with
    specs is that one often doesn't get them, especially for RF parts.


    As to that 'security', when one laser hits an other cubesat, the beam is >>> usualy a bit wider than the receiver's opening,
    so part will reflect off, light that area of the usually shiny material
    the cube is made off.
    Attacker just points a telescope from his own cubesat in space to that
    light and listens in.

    The time of intercept will be seconds. That won't gather enough data
    to break even modest encryption.

    It's a lot more secure than spraying RF all over space.



    Eavesdropping on optical communications in orbit is doomed by the photon >statistics. An ideal receiver gets a SNR of N/2B, where N is the photon >detection rate and B is the bandwidth.

    (I expect that the Flying Dutchman has been hanging around SED too much,
    and so has forgotten what SNR is. ) ;)

    Cheers

    Phil Hobbs

    Yeah, optical photons are crunchier than RF photons.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From jeroen@21:1/5 to Jan Panteltje on Thu Jan 4 00:05:24 2024
    On 2024-01-03 07:43, Jan Panteltje wrote:
    On a sunny day (Tue, 02 Jan 2024 08:32:56 -0800) it happened John Larkin <jl@997PotHill.com> wrote in <ctd8pilgi7p9tu5vkb3q4hr32j1b08g751@4ax.com>:

    On Tue, 02 Jan 2024 06:17:02 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Mon, 01 Jan 2024 08:21:21 -0800) it happened John Larkin >>> <jl@997PotHill.com> wrote in <ddp5pid6em18b40pqoh8ph81mg588h7sqa@4ax.com>: >>>
    On Mon, 01 Jan 2024 05:56:59 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    On a sunny day (Sun, 31 Dec 2023 08:17:20 -0800) it happened John Larkin >>>>> <jl@997PotHill.com> wrote in <ct43pil1ft3o458ur4p32kmp7l2om7j5t2@4ax.com>:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>>>>> wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    NASA is a bloated money burning institution. I know people who are >>>>>> doing optical satellite comm for a lot less.

    Really? how did they get into space a few million miles away?

    The folks that I know are doing LEO cubesats, cube to cube comm.

    There are, for some odd reason, two cubesat companies within walking
    distance of my office. Cubeville CA.

    I see you are offending other google using posters..

    Did my paragraphs above offend you? Why?

    Drinking problem?

    When Mo and I are in a wild mood, we split a beer.

    cubesats round the earth at low altitude.

    Did I mention "LEO" ?



    Laser commi-nuka (sorry that was Reagan) communication to space was already used by the French years ago, 2001 ESA:

    https://www.esa.int/Applications/Connectivity_and_Secure_Communications/A_world_first_Data_transmission_between_European_satellites_using_laser_light

    You do not read! the article is about very long distance data transmission with lasers.
    It is a NASA project
    700 million is nothing compared to the money burned by the loss making US Military Industrial Complex
    payed for by your taxes and even then creating an ever greater US debt and ever more US enemies, killing thousands,
    eroding the dollar use (now below 60 percent of world wide used currency). >>>
    And we actually discussed the subject before, you did not know back then that a laser beam diverges.

    Except that I compared the divergence if a laser with that of a
    microwave antenna. With numbers.

    That was just a few month ago.

    So cool it man!

    Famous quote: "Don't be a jerk Mervin. Nobody likes jerks."

    Well you contribution to the newsgroup are not that good
    showing off 2k dollar giggle hertz scopes may be help sell?
    Using things out of spec... all the time?

    As to that 'security', when one laser hits an other cubesat, the beam is usualy a bit wider than the receiver's opening,
    so part will reflect off, light that area of the usually shiny material the cube is made off.
    Attacker just points a telescope from his own cubesat in space to that light and listens in.
    Could even work from earth if skies are clear.
    NOTHING is ever 100% secure,.
    I was thinking just hack Hubble or Webb and have it point at the millions miles (or km if you wish) far away thing..
    hacking those things is likely easy.

    I am considering leaving Usenet (many happy now) since when was it? Win 3.1? Anybody can visit https://panteltje.online if interested in projects I did.

    Too many insults and bull here, like that CERN guy talking about creeps
    A creep is an animal that possible lives in holes underground, like CERN people live in tunnels
    are religious fanatics parroting Albert OneStone's hay is em see squared and think that by shooting Teslas
    at close to light speed they will find out the programming of auto pilot and the inner construction of its chips
    An other silly project looking for the 'god' particle
    a dropping place for mamaticians where they do a divide by zero and lose grab of reality
    then do re-normalization to come up with idiot things like holographic universes and string theory.
    CERN even detected faster than light .. pity they did not know how their own equipment worked.
    The creeps are sucking taxpayer money, keep people stupid,
    use so much energy that the planet heats up incredibly fast and for more then 70 years now? have produced absolutely nothing useful.
    Same as that laser fussion or was it fuzzy project you supply equipment to, and sane as ITER.
    Always things need to be 'just a little bit bigger' and more money is needed. Bomb shelters is likely best use of CERN.
    So here my views, others working for the US mil complex never posting anything useful.
    F35 sucks and is a noisy pest.



    I happened to be in NL between Christmas and New year. I should have dropped
    by to see you. I'm sure we'd get along.

    Jeroen Belleman

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From David Lesher@21:1/5 to Jeff Liebermann on Fri Feb 2 03:33:34 2024
    Jeff Liebermann <jeffl@cruzio.com> writes:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid>
    wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    Perhaps NASA should just give the project and the money to SpaceX,
    which already has a working space laser mesh communications system.

    Over what distance?

    --
    A host is a host from coast to coast...............wb8foz@panix.com
    & no one will talk to a host that's close..........................
    Unless the host (that isn't close).........................pob 1433
    is busy, hung or dead....................................20915-1433

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jeff Liebermann@21:1/5 to wb8foz@panix.com on Fri Feb 2 20:55:32 2024
    On Fri, 2 Feb 2024 03:33:34 -0000 (UTC), David Lesher
    <wb8foz@panix.com> wrote:

    Jeff Liebermann <jeffl@cruzio.com> writes:

    On Sun, 31 Dec 2023 05:49:41 GMT, Jan Panteltje <alien@comet.invalid> >>wrote:

    A cat video highlighted a big year for lasers in space
    NASA has invested more than $700 million in testing laser communications in space.
    https://arstechnica.com/space/2023/12/a-cat-video-highlighted-a-big-year-for-lasers-in-space/

    Perhaps NASA should just give the project and the money to SpaceX,
    which already has a working space laser mesh communications system.

    Over what distance?

    About 36,000 km (22,000 miles), ground to the LCRD in geosynchronous
    orbit. Test bandwidth is 1.244 Gigabits/sec bidirectional. Average
    power is 0.5 watts. LCDR was launched on Dec 7, 2021.

    "Laser Communications Relay Demonstration (LCRD)" <https://en.wikipedia.org/wiki/Laser_Communications_Relay_Demonstration>

    "Laser Communications Relay Demonstration (LCRD) Overview" (2021) <https://www.nasa.gov/directorates/stmd/tech-demo-missions-program/laser-communications-relay-demonstration-lcrd-overview/>

    "Update on NASA’s Laser Communications Relay Demonstration Project"
    (2018)
    <https://arc.aiaa.org/doi/pdf/10.2514/6.2018-2395>

    "NASA’s Laser Communications Relay: A Year of Experimentation" <https://www.nasa.gov/missions/tech-demonstration/nasas-laser-communications-relay-a-year-of-experimentation/>
    "Located in geosynchronous orbit 22,000 miles above Earth, LCRD is
    currently acting as an experiment platform for NASA, other government
    agencies, academia, and commercial companies to test laser
    communications capabilities."

    More:
    <https://www.google.com/search?q=lcrd>

    I once found the link budget calculations, but now I can't find them.
    Try your luck: <https://www.google.com/search?q=%22LCRD%22+link+budget&tbm=isch>


    --
    Jeff Liebermann jeffl@cruzio.com
    PO Box 272 http://www.LearnByDestroying.com
    Ben Lomond CA 95005-0272
    Skype: JeffLiebermann AE6KS 831-336-2558

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)