rich...@karlquist.com said:
Solid dielectric cable and connectors of 3.5 mm size are mode limited to 18
GHz. That is why there is so much stuff rated at 18 GHz as opposed to 16 or
20 GHz.
Thanks. That's what I was looking for.
Wiki says that SMA works to 18 GHz and the 3.5 mm is good for
On 2/26/14 12:44 AM, Hal Murray wrote:
rich...@karlquist.com said:
Solid dielectric cable and connectors of 3.5 mm size are mode limited to 18
GHz. That is why there is so much stuff rated at 18 GHz as opposed to 16 or
20 GHz.
Thanks. That's what I was looking for.
Wiki says that SMA
Gravity Probe A used Hydrogen Masers to verify gravitational rate change.
1976 and suborbital, so not exactly the same as Red Shift mentioned in
the HP note.
I myself participated in a variation of Pound-Rebka-Snider (Mossbauer
nuclear physics techniques) in the 1980's.
On Mon, Feb 24, 2014 at
Hi
One of the more common explanations for the 18 GHz “upper limit” is that the
broad water vapor absorption peak at about 23 GHz made systems less practical
as you went up from 18. I suspect the same water issues make certain types of
parts more difficult to fabricate.
Bob
On Feb 26, 2014,
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So what's all this about a Thallium Beam Tube???
(Isn't Thallium incredibly toxic?)
n.b. One of the pictures references a Th beam tube...
On Tue, Feb 25, 2014 at 2:46 AM, Poul-Henning Kamp p...@phk.freebsd.dkwrote:
[Jim Lux]
Wasn't that Gravity Probe B.. which finally launched in 2004,
So what's all this about a Thallium Beam Tube???
For info about the pro/con of Thallium beam frequency standards, see:
http://tf.boulder.nist.gov/general/pdf/9.pdf
http://tf.boulder.nist.gov/general/pdf/211.pdf
http://leapsecond.com/history/1965-Metrologia-v1-n3-Cesium.pdf
Imagine 21310.833946
Thanks, also consider the HP patent:
http://www.google.com/patents/US3407295
On Tue, Feb 25, 2014 at 4:40 PM, Tom Van Baak t...@leapsecond.com wrote:
So what's all this about a Thallium Beam Tube???
For info about the pro/con of Thallium beam frequency standards, see:
On 2/25/14 1:40 PM, Tom Van Baak wrote:
So what's all this about a Thallium Beam Tube???
For info about the pro/con of Thallium beam frequency standards, see:
http://tf.boulder.nist.gov/general/pdf/9.pdf
http://tf.boulder.nist.gov/general/pdf/211.pdf
jim...@earthlink.net said:
there's a BIG jump in cost when you cross that 18GHz boundary line.
What's magic about 18 GHz? Why not 16 or 20?
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Lot's of connectors change specification @ 18Ghz or are not rated bast
18Ghz.
On Tue, Feb 25, 2014 at 11:55 PM, Hal Murray hmur...@megapathdsl.netwrote:
jim...@earthlink.net said:
there's a BIG jump in cost when you cross that 18GHz boundary line.
What's magic about 18 GHz? Why not 16
Solid dielectric cable and connectors of 3.5 mm size
are mode limited to 18 GHz. That is why there is
so much stuff rated at 18 GHz as opposed to 16 or
20 GHz. The next jump up is 26.5 GHz where 3.5
mm size works in air dielectric. It costs more
to make these components and the volume is
In message caa-f0u_jbz5dyb+hacmwfpkz6vhfo7arz+jpsmhrt9uss2n...@mail.gmail.com
, Pete Lancashire writes:
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf
pages 8 9
As far as I know, those satellites never made it to orbit ?
Also: You can just see the writer
I couldn't get the link to work (it just hangs).
However, I vaguely remember when we were starting
work on the 5071A that the reason why we used
the model number 5071A instead of 5070A was that
the latter number had been reserved for a hydrogen
maser that was never sold. The person in charge
of
Does this hang ?
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/
On Mon, Feb 24, 2014 at 8:50 AM, Richard (Rick) Karlquist
rich...@karlquist.com wrote:
I couldn't get the link to work (it just hangs).
However, I vaguely remember when we were starting
work on the 5071A
HP was always a class act, proven by the classic Woody wagons used to
transport gear in the photos.
Thomas Knox
To: time-nuts@febo.com; p...@petelancashire.com
From: p...@phk.freebsd.dk
Date: Mon, 24 Feb 2014 16:17:23 +
Subject: Re: [time-nuts] A small piece on HP's hydrogen maser
On 2/24/2014 8:54 AM, Pete Lancashire wrote:
Does this hang ?
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/
That works, but when i click on the actual link to the
actual, my browser still hangs.
Rick
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time-nuts mailing
Still doesn't work for me.
On 2/24/2014 8:57 AM, Had wrote:
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09
.pdf
Rick, I got the above to work with no problem. The original link was busted.
Had
K7MLR
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time-nuts
Worked fine for me earlier. May want to try to dump your cache and cookies.
That seems to help when things get silly.
All of that said and back to the numbers. That would have been way back in
1968 and there would have been artificial gods that controlled the numbers.
These odd folks still exist
When there are extraneous characters and a line feed added by some word
wrapping I use this method:
1) Forward the email
2) delete the extra characters, getting the proper URL back
3) Copy the URL to the clipboard
4) Open browser and paste URL in
After that, trash the forward email.
The link
The.pdf got caught up in a linefeed/carriagereturn
-Original Message-
From: Richard (Rick) Karlquist
Sent: Monday, February 24, 2014 11:34 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] A small piece on HP's hydrogen maser
On 2/24/2014 1:59 PM, dlewis wrote:
The.pdf got caught up in a linefeed/carriagereturn
Wouldn't that problem result in a file not found error
rather than just hanging?
I eventually got the link to work from Internet Explorer,
which took 5 minutes to download it. It never worked
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf
This broken link business is very common in some browsers (in Windows).
It's because there's an underline in the original URL. When the browser
sees a link it underlines it in blue, which converts the
On 2/24/14 8:17 AM, Poul-Henning Kamp wrote:
In message caa-f0u_jbz5dyb+hacmwfpkz6vhfo7arz+jpsmhrt9uss2n...@mail.gmail.com
, Pete Lancashire writes:
http://www.hp.com/hpinfo/abouthp/histnfacts/publications/measure/pdf/1968_09.pdf
pages 8 9
As far as I know, those satellites never made it
In the back of my head, I beleive that project red shift did fly, but they
dumped the hydrogen masers to use brand new lighter weight and much smaller
rubidiums.
GET FREE SMILEYS FOR YOUR IM EMAIL - Learn more at
That was my experience with XP and IE 8.
Downloading began at once and the byte counter rolled on up to the
target in a minute or so, but I couldn't read the document. My network
indicator stayed lit, and Properties showed message flow, so I did
something else and came back to find it done.
Has
Great articles in the result, though.
I didn't know the whole history of this, even being
in frequency standards at HP for years. I see
there is a picture of Lou Mueller. He was
extremely smart guy to work with. I learned
an immense amount of physics from him.
Rick Karlquist N6RK
[Jim Lux]
Wasn't that Gravity Probe B.. which finally launched in 2004, and had
equivocal results.
No, GPB was the gyro-experiment, it tested another part of GR than
red shift was supposed to.
[Tony Greene]
In the back of my head, I beleive that project red shift did fly,
but they dumped
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