https://youtu.be/a0erYlecVkc

That's amusing.

And Yes, we know... "Trump did this and that and the other, yada yada yada".

On Tuesday, July 20, 2021 at 3:15:08 PM UTC+10, John Doe wrote:
> https://youtu.be/a0erYlecVkc
>
> That's amusing.
>
> And Yes, we know... "Trump did this and that and the other, yada yada yada".

It may amuse John Doe - he's got strange tastes. I suppose some of us might be amused if John Doe tested positive for Covid-19, but he's already tested positive for brain-rot, so it would be pretty much irrelevant.

--
Bill Sloman, Sydney

On 7/20/2021 1:15 AM, John Doe wrote:
> https://youtu.be/a0erYlecVkc
>
> That's amusing.
>
> And Yes, we know... "Trump did this and that and the other, yada yada yada".
>

Ya he and every Fox talking head got vaccinated and now make a career of
telling all the stupos who listen to them not to do it. Asking "how
fucking dumb are these people?" about their fanbase would be a pertinent
question if I didn't already know the answer.

On Tuesday, July 20, 2021 at 3:10:18 AM UTC-4, bitrex wrote:
> On 7/20/2021 1:15 AM, John Doe wrote:
> > https://youtu.be/a0erYlecVkc
> >
> > That's amusing.
> >
> > And Yes, we know... "Trump did this and that and the other, yada yada yada".
> >
> Ya he and every Fox talking head got vaccinated and now make a career of
> telling all the stupos who listen to them not to do it. Asking "how
> fucking dumb are these people?" about their fanbase would be a pertinent
> question if I didn't already know the answer.

You have to admit the pictures are pretty disturbing, flying without masks, meetings of 20 or more people without masks even the small meeting without masks. Sounds like something Trmp would do. Shows stupidity and arrogance sits on both sides of the isle.

The rest of the video is just Fox appeasing their viewers with sensationalism.

--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209

On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
<always.look@message.header> wrote:

>https://youtu.be/a0erYlecVkc
>
>That's amusing.

Yes. They abandoned their jobs and packed into a hired plane with lots
of beer and no masks. I suspect that some fibbed about having their
shots.

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

On Tue, 20 Jul 2021 03:10:10 -0400, bitrex <user@example.net> wrote:

>On 7/20/2021 1:15 AM, John Doe wrote:
>> https://youtu.be/a0erYlecVkc
>>
>> That's amusing.
>>
>> And Yes, we know... "Trump did this and that and the other, yada yada yada".
>>
>
>Ya he and every Fox talking head got vaccinated and now make a career of
>telling all the stupos who listen to them not to do it. Asking "how
>fucking dumb are these people?" about their fanbase would be a pertinent
>question if I didn't already know the answer.

Trump's Project Warp Speed saved a lot of lives. The europeans didn't
do the vaccine thing as well. Talk doesn't matter; lives do.

Case growth in the UK is shocking. They look to be headed for an
all-time new peak.

https://www.worldometers.info/coronavirus/country/uk/

Spain too.

Sweden is nearly zero new cases.

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

On Tuesday, July 20, 2021 at 8:42:29 PM UTC+10, jla...@highlandsniptechnology.com wrote:
> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
> <alway...@message.header> wrote:
>
> >https://youtu.be/a0erYlecVkc
> >
> >That's amusing.
>
> Yes. They abandoned their jobs and packed into a hired plane with lots
> of beer and no masks. I suspect that some fibbed about having their
> shots.

They made a tactical move to stop the Texan Republicans disenfranchising even more of the people likely to vote for them.

This is doing their jobs, not abandoning them. John Larkin does seem to like Republicans and dislike Democrats, so the snide comments about masks should not be taken too seriously.

--
Bill Sloman, Sydney

On Tuesday, July 20, 2021 at 8:54:04 PM UTC+10, jla...@highlandsniptechnology.com wrote:
> On Tue, 20 Jul 2021 03:10:10 -0400, bitrex <us...@example.net> wrote:
>
> >On 7/20/2021 1:15 AM, John Doe wrote:
> >> https://youtu.be/a0erYlecVkc
> >>
> >> That's amusing.
> >>
> >> And Yes, we know... "Trump did this and that and the other, yada yada yada".
> >>
> >
> >Ya he and every Fox talking head got vaccinated and now make a career of
> >telling all the stupos who listen to them not to do it. Asking "how
> >fucking dumb are these people?" about their fanbase would be a pertinent
> >question if I didn't already know the answer.
>
> Trump's Project Warp Speed saved a lot of lives.

It didn't. Trump jumped on that band-waggon long after it had started rolling. The money he put in towards vaccine development was useful, but investors were queuing up to put money in anyway.

> The Europeans didn't do the vaccine thing as well. Talk doesn't matter; lives do.

I wonder what John thinks he means by that. Most of the vaccines are European, and the United States hasn't got as much of its population vaccinated as most European countries.

https://www.nytimes.com/interactive/2021/world/covid-vaccinations-tracker.html
> Case growth in the UK is shocking. They look to be headed for an all-time new peak.

Boris Johnson has a lot in common with Trump.

> https://www.worldometers.info/coronavirus/country/uk/
>
> Spain too.
>
> Sweden is at nearly zero new cases.

The seven-day moving average is 250 out of 10 million people. Australia is having a Covid-19 outbreak, and it has got 103 news cases out of 27 million people. We have locked down half the population to get that number back down to zero.

John Larkin's idea of what constitutes "nearly zero" is a trifle bizarre.

--
Bill Sloman, Sydney

On 7/20/2021 6:20 AM, Rick C wrote:
> On Tuesday, July 20, 2021 at 3:10:18 AM UTC-4, bitrex wrote:
>> On 7/20/2021 1:15 AM, John Doe wrote:
>>> https://youtu.be/a0erYlecVkc
>>>
>>> That's amusing.
>>>
>>> And Yes, we know... "Trump did this and that and the other, yada yada yada".
>>>
>> Ya he and every Fox talking head got vaccinated and now make a career of
>> telling all the stupos who listen to them not to do it. Asking "how
>> fucking dumb are these people?" about their fanbase would be a pertinent
>> question if I didn't already know the answer.
>
> You have to admit the pictures are pretty disturbing, flying without masks, meetings of 20 or more people without masks even the small meeting without masks. Sounds like something Trmp would do. Shows stupidity and arrogance sits on both sides of the isle.
>
> The rest of the video is just Fox appeasing their viewers with sensationalism.
>

Yeah being a Democrat is a lousy job; always taking shit whenever they
do the same shit Republicans do and their hut hut Roman-salute-throwing
"base" loves them for. It is pretty astonishing anyone signs up for it.

On 7/20/2021 6:53 AM, jlarkin@highlandsniptechnology.com wrote:
> On Tue, 20 Jul 2021 03:10:10 -0400, bitrex <user@example.net> wrote:
>
>> On 7/20/2021 1:15 AM, John Doe wrote:
>>> https://youtu.be/a0erYlecVkc
>>>
>>> That's amusing.
>>>
>>> And Yes, we know... "Trump did this and that and the other, yada yada yada".
>>>
>>
>> Ya he and every Fox talking head got vaccinated and now make a career of
>> telling all the stupos who listen to them not to do it. Asking "how
>> fucking dumb are these people?" about their fanbase would be a pertinent
>> question if I didn't already know the answer.
>
> Trump's Project Warp Speed saved a lot of lives. The europeans didn't
> do the vaccine thing as well. Talk doesn't matter; lives do.

Imagine how many lives could've been saved if he'd applied his great
salesmanship skills to actually selling his own project instead of the
reverse, if that's what it was...

On 7/20/2021 6:42 AM, jlarkin@highlandsniptechnology.com wrote:
> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
> <always.look@message.header> wrote:
>
>> https://youtu.be/a0erYlecVkc
>>
>> That's amusing.
>
> Yes. They abandoned their jobs and packed into a hired plane with lots
> of beer and no masks. I suspect that some fibbed about having their
> shots.

Better to take the stance most Republicans in Congress and Fox
talking-heads seem to take, "I prefer not to answer that question..."

On 7/20/2021 11:18 AM, bitrex wrote:
> On 7/20/2021 6:42 AM, jlarkin@highlandsniptechnology.com wrote:
>> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
>> <always.look@message.header> wrote:
>>
>>> https://youtu.be/a0erYlecVkc
>>>
>>> That's amusing.
>>
>> Yes. They abandoned their jobs and packed into a hired plane with lots
>> of beer and no masks. I suspect that some fibbed about having their
>> shots.
>
> Better to take the stance most Republicans in Congress and Fox
> talking-heads seem to take, "I prefer not to answer that question..."
>

In fact I think the major difference between a successful right-wing
wheeler-dealer and the rank-and-file wanna-bes is the former has a
better sense of when to take the 5th and keep quiet...

On Tue, 20 Jul 2021 11:12:03 -0400, bitrex <user@example.net> wrote:

>On 7/20/2021 6:53 AM, jlarkin@highlandsniptechnology.com wrote:
>> On Tue, 20 Jul 2021 03:10:10 -0400, bitrex <user@example.net> wrote:
>>
>>> On 7/20/2021 1:15 AM, John Doe wrote:
>>>> https://youtu.be/a0erYlecVkc
>>>>
>>>> That's amusing.
>>>>
>>>> And Yes, we know... "Trump did this and that and the other, yada yada yada".
>>>>
>>>
>>> Ya he and every Fox talking head got vaccinated and now make a career of
>>> telling all the stupos who listen to them not to do it. Asking "how
>>> fucking dumb are these people?" about their fanbase would be a pertinent
>>> question if I didn't already know the answer.
>>
>> Trump's Project Warp Speed saved a lot of lives. The europeans didn't
>> do the vaccine thing as well. Talk doesn't matter; lives do.
>
>Imagine how many lives could've been saved if he'd applied his great
>salesmanship skills to actually selling his own project instead of the
>reverse, if that's what it was...
>

You just don't like Trump. That's feeling, not thinking, and
absolutely normal.

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

On Tue, 20 Jul 2021 11:25:18 -0400, bitrex <user@example.net> wrote:

>On 7/20/2021 11:18 AM, bitrex wrote:
>> On 7/20/2021 6:42 AM, jlarkin@highlandsniptechnology.com wrote:
>>> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
>>> <always.look@message.header> wrote:
>>>
>>>> https://youtu.be/a0erYlecVkc
>>>>
>>>> That's amusing.
>>>
>>> Yes. They abandoned their jobs and packed into a hired plane with lots
>>> of beer and no masks. I suspect that some fibbed about having their
>>> shots.
>>
>> Better to take the stance most Republicans in Congress and Fox
>> talking-heads seem to take, "I prefer not to answer that question..."
>>
>
>In fact I think the major difference between a successful right-wing
>wheeler-dealer and the rank-and-file wanna-bes is the former has a
>better sense of when to take the 5th and keep quiet...

You make up silly stories to ramp up your tribalism. They don't make
sense.

You don't post much electronics either.

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

On 2021/07/20 3:53 a.m., jlarkin@highlandsniptechnology.com wrote:
> On Tue, 20 Jul 2021 03:10:10 -0400, bitrex <user@example.net> wrote:
>
>> On 7/20/2021 1:15 AM, John Doe wrote:
>>> https://youtu.be/a0erYlecVkc
>>>
>>> That's amusing.
>>>
>>> And Yes, we know... "Trump did this and that and the other, yada yada yada".
>>>
>>
>> Ya he and every Fox talking head got vaccinated and now make a career of
>> telling all the stupos who listen to them not to do it. Asking "how
>> fucking dumb are these people?" about their fanbase would be a pertinent
>> question if I didn't already know the answer.
>
> Trump's Project Warp Speed saved a lot of lives. The europeans didn't
> do the vaccine thing as well. Talk doesn't matter; lives do.

Phizer refused to take part in Warp Speed and ended up producing one of
the first effective vaccines. Trump can't claim credit for that. And
Warp Speed was running before Trump got on board - he is never a leader,
he only follows when it looks good. Perhaps he should be called "Hindmost"?

Trump got vaccinated and is now telling his remoras (look it up) to not
get vaccinated.

He is simply a con man. His agenda is not to be what he sees as being a
loser. Like losing an election, losing court appeals. Losing the respect
of most of the world...

What a hoser!

John

On Tuesday, July 20, 2021 at 3:54:04 AM UTC-7, jla...@highlandsniptechnology.com wrote:

> Trump's Project Warp Speed saved a lot of lives.

That's last year's fake news. Trump was a camera hog,
but an information sphincter. You can't name most of the
real workers on the various solutions, so you pick the
guy who blamed everyone he could think of, loudly
and on-camera. The governor of Washington state
was the first politician to try to grapple the problem (and
has good vaccination stats to show for it) but the Donald
wouldn't even let Pence phone him.

Several states (Tennessee, Florida, New York) are still squabbling
and blame-dodging, in follow-the-leader fashion. It's a disgraceful
fashion.

Am 20.07.21 um 18:29 schrieb John Robertson:
>
> On 2021/07/20 3:53 a.m., jlarkin@highlandsniptechnology.com wrote:
>> On Tue, 20 Jul 2021 03:10:10 -0400, bitrex <user@example.net> wrote:
>>
>>> On 7/20/2021 1:15 AM, John Doe wrote:
>>>> https://youtu.be/a0erYlecVkc
>>>>
>>>> That's amusing.
>>>>
>>>> And Yes, we know... "Trump did this and that and the other, yada
>>>> yada yada".
>>>>
>>>
>>> Ya he and every Fox talking head got vaccinated and now make a career of
>>> telling all the stupos who listen to them not to do it. Asking "how
>>> fucking dumb are these people?" about their fanbase would be a pertinent
>>> question if I didn't already know the answer.
>>
>> Trump's Project Warp Speed saved a lot of lives. The europeans didn't
>> do the vaccine thing as well. Talk doesn't matter; lives do.
>
> Phizer refused to take part in Warp Speed and ended up producing one of
> the first effective vaccines.

No. Actually, Pfizer produced nothing, so there was nothing to speed up
to Warp. They did provide the efficiency tests for their distribution
region and pulled the good stuff on bottles in their plant in Belgium,
close to the source. That's it.
The original manufacturer is Biontech in Mainz, Germany with 4 or 5
other plants.

OXAZ was an English/Nordic development and JJ was the first genuine
American product, months later.

When John writes " The europeans didn't do the vaccine thing as well. "
he makes a complete bozo out of himself.
It were the Europeans who delivered first.
And the Chinese, Russians, Indians.

> Trump can't claim credit for that. And
> Warp Speed was running before Trump got on board - he is never a leader,
> he only follows when it looks good. Perhaps he should be called "Hindmost"?
>
> Trump got vaccinated and is now telling his remoras (look it up) to not
> get vaccinated.
>
> He is simply a con man. His agenda is not to be what he sees as being a
> loser. Like losing an election, losing court appeals. Losing the respect
> of most of the world...
>
> What a hoser!

+1

On 7/20/2021 11:31 AM, jlarkin@highlandsniptechnology.com wrote:
> On Tue, 20 Jul 2021 11:25:18 -0400, bitrex <user@example.net> wrote:
>
>> On 7/20/2021 11:18 AM, bitrex wrote:
>>> On 7/20/2021 6:42 AM, jlarkin@highlandsniptechnology.com wrote:
>>>> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
>>>> <always.look@message.header> wrote:
>>>>
>>>>> https://youtu.be/a0erYlecVkc
>>>>>
>>>>> That's amusing.
>>>>
>>>> Yes. They abandoned their jobs and packed into a hired plane with lots
>>>> of beer and no masks. I suspect that some fibbed about having their
>>>> shots.
>>>
>>> Better to take the stance most Republicans in Congress and Fox
>>> talking-heads seem to take, "I prefer not to answer that question..."
>>>
>>
>> In fact I think the major difference between a successful right-wing
>> wheeler-dealer and the rank-and-file wanna-bes is the former has a
>> better sense of when to take the 5th and keep quiet...
>
> You make up silly stories to ramp up your tribalism. They don't make
> sense.
>
> You don't post much electronics either.
>
>
>

I'm mostly doing SPLC design these days, the GreenPAK devices in
particular. Sadly nobody here seems much interested in 'em except BoB as
I recall so there's not a lot to say about it.

Meanwhile I'm taking this power electronics course online, they have a
decent number of solid EE seminars at this site:

<https://www.coursera.org/specializations/modeling-and-control-of-power-electronics>

Fair weather in New England is too rare to spend it cooped up at the
bench too long if it can be avoided, there's six months of winter for that.

On Tue, 20 Jul 2021 18:15:25 -0400, bitrex <user@example.net> wrote:

>On 7/20/2021 11:31 AM, jlarkin@highlandsniptechnology.com wrote:
>> On Tue, 20 Jul 2021 11:25:18 -0400, bitrex <user@example.net> wrote:
>>
>>> On 7/20/2021 11:18 AM, bitrex wrote:
>>>> On 7/20/2021 6:42 AM, jlarkin@highlandsniptechnology.com wrote:
>>>>> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
>>>>> <always.look@message.header> wrote:
>>>>>
>>>>>> https://youtu.be/a0erYlecVkc
>>>>>>
>>>>>> That's amusing.
>>>>>
>>>>> Yes. They abandoned their jobs and packed into a hired plane with lots
>>>>> of beer and no masks. I suspect that some fibbed about having their
>>>>> shots.
>>>>
>>>> Better to take the stance most Republicans in Congress and Fox
>>>> talking-heads seem to take, "I prefer not to answer that question..."
>>>>
>>>
>>> In fact I think the major difference between a successful right-wing
>>> wheeler-dealer and the rank-and-file wanna-bes is the former has a
>>> better sense of when to take the 5th and keep quiet...
>>
>> You make up silly stories to ramp up your tribalism. They don't make
>> sense.
>>
>> You don't post much electronics either.
>>
>>
>>
>
>I'm mostly doing SPLC design these days, the GreenPAK devices in
>particular. Sadly nobody here seems much interested in 'em except BoB as
>I recall so there's not a lot to say about it.
>
>Meanwhile I'm taking this power electronics course online, they have a
>decent number of solid EE seminars at this site:
>
><https://www.coursera.org/specializations/modeling-and-control-of-power-electronics>
>
>Fair weather in New England is too rare to spend it cooped up at the
>bench too long if it can be avoided, there's six months of winter for that.

My big problem now is thermal. I want to control the temperature of an
e/o modulator to millikelvins.

https://www.dropbox.com/s/uv2qdezceq08oed/T500_Block_1.jpg?raw=1

A big metal block with heaters is mostly a 1st-order system, so the
control dynamics is simple. Maybe a 15 minute thermal time constant.
But there will be heat losses and gradients everywhere, and I have no
tools to model that.

I guess we'll prototype it and try to measure things. Even that looks
hard.

The modulator has 4 SMA connectors that will add big, unknown
temperature errors.

On 2021-07-20, Gerhard Hoffmann <dk4xp@arcor.de> wrote:
> Am 20.07.21 um 18:29 schrieb John Robertson:
>>
>> On 2021/07/20 3:53 a.m., jlarkin@highlandsniptechnology.com wrote:
>>> On Tue, 20 Jul 2021 03:10:10 -0400, bitrex <user@example.net> wrote:
>>>
>>>> On 7/20/2021 1:15 AM, John Doe wrote:
>>>>> https://youtu.be/a0erYlecVkc
>>>>>
>>>>> That's amusing.
>>>>>
>>>>> And Yes, we know... "Trump did this and that and the other, yada
>>>>> yada yada".
>>>>>
>>>>
>>>> Ya he and every Fox talking head got vaccinated and now make a career of
>>>> telling all the stupos who listen to them not to do it. Asking "how
>>>> fucking dumb are these people?" about their fanbase would be a pertinent
>>>> question if I didn't already know the answer.
>>>
>>> Trump's Project Warp Speed saved a lot of lives. The europeans didn't
>>> do the vaccine thing as well. Talk doesn't matter; lives do.
>>
>> Phizer refused to take part in Warp Speed and ended up producing one of
>> the first effective vaccines.
>
> No. Actually, Pfizer produced nothing, so there was nothing to speed up
> to Warp. They did provide the efficiency tests for their distribution
> region and pulled the good stuff on bottles in their plant in Belgium,
> close to the source. That's it.
> The original manufacturer is Biontech in Mainz, Germany with 4 or 5
> other plants.
>
> OXAZ was an English/Nordic development and JJ was the first genuine
> American product, months later.

Isn't "Johnson and Johnson" the one developed by Janssen in The
Netherlands.

--
Jasen.

On Wednesday, July 21, 2021 at 1:29:03 AM UTC+10, jla...@highlandsniptechnology.com wrote:
> On Tue, 20 Jul 2021 11:12:03 -0400, bitrex <us...@example.net> wrote:
>
> >On 7/20/2021 6:53 AM, jla...@highlandsniptechnology.com wrote:
> >> On Tue, 20 Jul 2021 03:10:10 -0400, bitrex <us...@example.net> wrote:
> >>
> >>> On 7/20/2021 1:15 AM, John Doe wrote:
> >>>> https://youtu.be/a0erYlecVkc
> >>>>
> >>>> That's amusing.
> >>>>
> >>>> And Yes, we know... "Trump did this and that and the other, yada yada yada".
> >>>>
> >>>
> >>> Ya he and every Fox talking head got vaccinated and now make a career of
> >>> telling all the stupos who listen to them not to do it. Asking "how
> >>> fucking dumb are these people?" about their fanbase would be a pertinent
> >>> question if I didn't already know the answer.
> >>
> >> Trump's Project Warp Speed saved a lot of lives. The europeans didn't
> >> do the vaccine thing as well. Talk doesn't matter; lives do.
> >
> >Imagine how many lives could've been saved if he'd applied his great
> >salesmanship skills to actually selling his own project instead of the
> >reverse, if that's what it was...
> >
> You just don't like Trump.

That's perfectly rational. Liking him is confined to people with fairly advanced cases of irrationality. There do seem to be quite a few of them, but that's the US education system inaction.

> That's feeling, not thinking, and absolutely normal.

John Larkin may be an authority about "feeling". What he knows about "thinking" seems to be confined to watching other people do it.

Thinking that Trump was (and is) a dangerously incompetent egomaniac is entirely normal. If you can't think, you may not be able to come to this conclusion.

Somebody who "thinks" that anthrogenic global warming isn't happening, and wouldn't be a problem if it were happening, clearly isn't good at thinking.

--
Bill Sloman, Sydney

On Wednesday, July 21, 2021 at 10:20:39 AM UTC+10, John Larkin wrote:
> On Tue, 20 Jul 2021 18:15:25 -0400, bitrex <us...@example.net> wrote:
> >On 7/20/2021 11:31 AM, jla...@highlandsniptechnology.com wrote:
> >> On Tue, 20 Jul 2021 11:25:18 -0400, bitrex <us...@example.net> wrote:
> >>> On 7/20/2021 11:18 AM, bitrex wrote:
> >>>> On 7/20/2021 6:42 AM, jla...@highlandsniptechnology.com wrote:
> >>>>> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe <alway...@message.header> wrote:

<snip>

> My big problem now is thermal. I want to control the temperature of an
> e/o modulator to millikelvins.
>
> https://www.dropbox.com/s/uv2qdezceq08oed/T500_Block_1.jpg?raw=1

People have been doing that sort of thing for quite a while now.

https://iopscience.iop.org/article/10.1088/0957-0233/7/11/015/meta

which got published in 1996, includes a list of references to people who had done better than a millikelvin. Phil Hobbs has a copy.

It gets easier if you can bury the e/o modulator in insulation (light path excepted, obviously, but that seems to be defined by optical fibres if I read you sketch correctly).

> A big metal block with heaters is mostly a 1st-order system, so the
> control dynamics is simple. Maybe a 15 minute thermal time constant.

Not entirely. There's always a lag between the heaters and temperature sensor, and the heat generated in resistive heaters is proportional to square of the voltage you apply to them or the current you put through them. Peltier junctions are more linear, but the constant of proportionality varies with the temperature difference across them.
MOSFets can be more linear, if you keep track of the current actually flowing through them (and any current-limiting resistor you put in series with them).

> But there will be heat losses and gradients everywhere, and I have no tools to model that.

Of course you do.
> I guess we'll prototype it and try to measure things. Even that looks hard.

We prototyped and measured. It took a while, but it wasn't difficult, if a bit tedious.
> The modulator has 4 SMA connectors that will add big, unknown temperature errors.

Until you measure what they do. They are just a couple more routes for heat to flow between the modulator and its environment. Your aluminium block isn't going to be floating in mid-air - it's got to be located. You can't just hang the whole thing off the optical fibres.

--
Bill Sloman, Sydney

On 7/20/2021 8:20 PM, John Larkin wrote:
> On Tue, 20 Jul 2021 18:15:25 -0400, bitrex <user@example.net> wrote:
>
>> On 7/20/2021 11:31 AM, jlarkin@highlandsniptechnology.com wrote:
>>> On Tue, 20 Jul 2021 11:25:18 -0400, bitrex <user@example.net> wrote:
>>>
>>>> On 7/20/2021 11:18 AM, bitrex wrote:
>>>>> On 7/20/2021 6:42 AM, jlarkin@highlandsniptechnology.com wrote:
>>>>>> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
>>>>>> <always.look@message.header> wrote:
>>>>>>
>>>>>>> https://youtu.be/a0erYlecVkc
>>>>>>>
>>>>>>> That's amusing.
>>>>>>
>>>>>> Yes. They abandoned their jobs and packed into a hired plane with lots
>>>>>> of beer and no masks. I suspect that some fibbed about having their
>>>>>> shots.
>>>>>
>>>>> Better to take the stance most Republicans in Congress and Fox
>>>>> talking-heads seem to take, "I prefer not to answer that question..."
>>>>>
>>>>
>>>> In fact I think the major difference between a successful right-wing
>>>> wheeler-dealer and the rank-and-file wanna-bes is the former has a
>>>> better sense of when to take the 5th and keep quiet...
>>>
>>> You make up silly stories to ramp up your tribalism. They don't make
>>> sense.
>>>
>>> You don't post much electronics either.
>>>
>>>
>>>
>>
>> I'm mostly doing SPLC design these days, the GreenPAK devices in
>> particular. Sadly nobody here seems much interested in 'em except BoB as
>> I recall so there's not a lot to say about it.
>>
>> Meanwhile I'm taking this power electronics course online, they have a
>> decent number of solid EE seminars at this site:
>>
>> <https://www.coursera.org/specializations/modeling-and-control-of-power-electronics>
>>
>> Fair weather in New England is too rare to spend it cooped up at the
>> bench too long if it can be avoided, there's six months of winter for that.
>
> My big problem now is thermal. I want to control the temperature of an
> e/o modulator to millikelvins.
>
> https://www.dropbox.com/s/uv2qdezceq08oed/T500_Block_1.jpg?raw=1
>
> A big metal block with heaters is mostly a 1st-order system, so the
> control dynamics is simple. Maybe a 15 minute thermal time constant.
> But there will be heat losses and gradients everywhere, and I have no
> tools to model that.
>
> I guess we'll prototype it and try to measure things. Even that looks
> hard.
>
> The modulator has 4 SMA connectors that will add big, unknown
> temperature errors.
>

One loop and two heaters on the bottom seems kinda crude to stabilize to
millikelvins. Can you use the FETs for gross adjustment and maybe
Peltiers on the top or sides for faster fine control?

You can wrap a fine control loop inside a coarse control loop operating
on two state variables, a lil infrared camera might work for the coarse
adjustment a la : <https://ieeexplore.ieee.org/document/8801902>

On Wed, 21 Jul 2021 00:32:39 -0400, bitrex <user@example.net> wrote:

>On 7/20/2021 8:20 PM, John Larkin wrote:
>> On Tue, 20 Jul 2021 18:15:25 -0400, bitrex <user@example.net> wrote:
>>
>>> On 7/20/2021 11:31 AM, jlarkin@highlandsniptechnology.com wrote:
>>>> On Tue, 20 Jul 2021 11:25:18 -0400, bitrex <user@example.net> wrote:
>>>>
>>>>> On 7/20/2021 11:18 AM, bitrex wrote:
>>>>>> On 7/20/2021 6:42 AM, jlarkin@highlandsniptechnology.com wrote:
>>>>>>> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe
>>>>>>> <always.look@message.header> wrote:
>>>>>>>
>>>>>>>> https://youtu.be/a0erYlecVkc
>>>>>>>>
>>>>>>>> That's amusing.
>>>>>>>
>>>>>>> Yes. They abandoned their jobs and packed into a hired plane with lots
>>>>>>> of beer and no masks. I suspect that some fibbed about having their
>>>>>>> shots.
>>>>>>
>>>>>> Better to take the stance most Republicans in Congress and Fox
>>>>>> talking-heads seem to take, "I prefer not to answer that question..."
>>>>>>
>>>>>
>>>>> In fact I think the major difference between a successful right-wing
>>>>> wheeler-dealer and the rank-and-file wanna-bes is the former has a
>>>>> better sense of when to take the 5th and keep quiet...
>>>>
>>>> You make up silly stories to ramp up your tribalism. They don't make
>>>> sense.
>>>>
>>>> You don't post much electronics either.
>>>>
>>>>
>>>>
>>>
>>> I'm mostly doing SPLC design these days, the GreenPAK devices in
>>> particular. Sadly nobody here seems much interested in 'em except BoB as
>>> I recall so there's not a lot to say about it.
>>>
>>> Meanwhile I'm taking this power electronics course online, they have a
>>> decent number of solid EE seminars at this site:
>>>
>>> <https://www.coursera.org/specializations/modeling-and-control-of-power-electronics>
>>>
>>> Fair weather in New England is too rare to spend it cooped up at the
>>> bench too long if it can be avoided, there's six months of winter for that.
>>
>> My big problem now is thermal. I want to control the temperature of an
>> e/o modulator to millikelvins.
>>
>> https://www.dropbox.com/s/uv2qdezceq08oed/T500_Block_1.jpg?raw=1
>>
>> A big metal block with heaters is mostly a 1st-order system, so the
>> control dynamics is simple. Maybe a 15 minute thermal time constant.
>> But there will be heat losses and gradients everywhere, and I have no
>> tools to model that.
>>
>> I guess we'll prototype it and try to measure things. Even that looks
>> hard.
>>
>> The modulator has 4 SMA connectors that will add big, unknown
>> temperature errors.
>>
>
>One loop and two heaters on the bottom seems kinda crude to stabilize to
>millikelvins. Can you use the FETs for gross adjustment and maybe
>Peltiers on the top or sides for faster fine control?

The real issue is making the sensor truly represent the temperature of
the mach-zender elements inside the EOM, so we can feed back on that.
At millikelven level, nothing practical is isothermal.

There is a 20 GHz electrical path from the SMAs to the internal
lithium niobate bits, and anything that conducts electricity well also
conducts heat well. A hardline coax is a pretty good thermal antenna.

Really good OCXOs use a double oven. That's a good if expensive idea,
except for the hardlines drooling in ambient changes.

We might temperature regulate an SMA bulkhead feedthru, sort of a
thermal bootstrap.

>
>You can wrap a fine control loop inside a coarse control loop operating
>on two state variables, a lil infrared camera might work for the coarse
>adjustment a la : <https://ieeexplore.ieee.org/document/8801902>

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

On Wednesday, July 21, 2021 at 3:25:04 PM UTC+10, jla...@highlandsniptechnology.com wrote:
> On Wed, 21 Jul 2021 00:32:39 -0400, bitrex <us...@example.net> wrote:
> >On 7/20/2021 8:20 PM, John Larkin wrote:
> >> On Tue, 20 Jul 2021 18:15:25 -0400, bitrex <us...@example.net> wrote:
> >>> On 7/20/2021 11:31 AM, jla...@highlandsniptechnology.com wrote:
> >>>> On Tue, 20 Jul 2021 11:25:18 -0400, bitrex <us...@example.net> wrote:
> >>>>> On 7/20/2021 11:18 AM, bitrex wrote:
> >>>>>> On 7/20/2021 6:42 AM, jla...@highlandsniptechnology.com wrote:
> >>>>>>> On Tue, 20 Jul 2021 05:15:01 -0000 (UTC), John Doe <alway...@message.header> wrote:

<snip>

> >>>> You make up silly stories to ramp up your tribalism. They don't make sense.

Very little makes sense to John Larkin.

> >>>> You don't post much electronics either.

It doesn't come with flattering observations about John Larkin, so he doesn't read any of it

> >>> I'm mostly doing SPLC design these days, the GreenPAK devices in
> >>> particular. Sadly nobody here seems much interested in 'em except BoB as
> >>> I recall so there's not a lot to say about it.
> >>>
> >>> Meanwhile I'm taking this power electronics course online, they have a
> >>> decent number of solid EE seminars at this site:
> >>>
> >>> <https://www.coursera.org/specializations/modeling-and-control-of-power-electronics>
> >>>
> >>> Fair weather in New England is too rare to spend it cooped up at the
> >>> bench too long if it can be avoided, there's six months of winter for that.
> >>
> >> My big problem now is thermal. I want to control the temperature of an e/o modulator to millikelvins.
> >>
> >> https://www.dropbox.com/s/uv2qdezceq08oed/T500_Block_1.jpg?raw=1
> >>
> >> A big metal block with heaters is mostly a 1st-order system, so the
> >> control dynamics is simple. Maybe a 15 minute thermal time constant.
> >> But there will be heat losses and gradients everywhere, and I have no tools to model that.

None that he's aware if.

> >> I guess we'll prototype it and try to measure things. Even that looks hard.

It isn't. Merely tedious.

> >> The modulator has 4 SMA connectors that will add big, unknown
> >> temperature errors.
> >>
> >
> >One loop and two heaters on the bottom seems kinda crude to stabilize to
> >millikelvins. Can you use the FETs for gross adjustment and maybe
> >Peltiers on the top or sides for faster fine control?

You don't have to. People had stabilised down to a few micro-kelvins in the 1970's with single lop controillers. It helps to have a well-insulted blob to start with.

> The real issue is making the sensor truly represent the temperature of the mach-zender elements inside the EOM, so we can feed back on that.

You might want to add a second sensor. Phil Hobbs is a full bottle on that.

> At millikelven level, nothing practical is isothermal.

It there's no heat flowing through a thermal resistance, there isn't any temperature difference. Good external insulation helps there.
> There is a 20 GHz electrical path from the SMAs to the internal
> lithium niobate bits, and anything that conducts electricity well also
> conducts heat well. A hardline coax is a pretty good thermal antenna.

There's much less difference in thermal conductivity between metals and non-metals than there is in electrical conductivity.
> Really good OCXOs use a double oven. That's a good if expensive idea, except for the hardlines drooling in ambient changes.

It isn't an expensive idea. Ovens are cheap.
> We might temperature regulate an SMA bulkhead feedthru, sort of a thermal bootstrap.

Sounds very sensible.
> >You can wrap a fine control loop inside a coarse control loop operating
> >on two state variables, a lil infrared camera might work for the coarse
> >adjustment a la : <https://ieeexplore.ieee.org/document/8801902>

Why bother? Thermistors are cheap.

--
Bill Sloman, Sydney