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Please excuse my ignorance [I marvel/wonder at some of the essotevric
comments on this group], but why are atomic clocks reliant on these two rare
elements? - why not mercury, or water vapor, they are a lot easier to find.
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I was surprised to read that crimping is considered most reliable. I
work in broadcast television, and we have rows and rows of video
patch panels. Decades ago, the coaxs were soldered to the MUSA
connectors on the bay, but in
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Don Collie wrote:
Please excuse my ignorance [I marvel/wonder at some of the essotevric
comments on this group], but why are atomic clocks reliant on these two rare
elements? - why not mercury, or water vapor, they are a lot
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Good day,
*** REPLY SEPARATOR ***
On 27-Jul-07 at 08:29 Peter Vince wrote:
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I was surprised to read that crimping is considered most reliable...
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Bob Paddock wrote:
On Friday 27 July 2007 04:14, Dr Bruce Griffiths wrote:
22GHz,
(15GHz)
(~40.5 GHz) than either the caesium
(9.192GHz) or rubidium
(6.8GHz)
Anything happening in the THz range, that anyone
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On Friday 27 July 2007 04:14, Dr Bruce Griffiths wrote:
22GHz,
(15GHz)
(~40.5 GHz) than either the caesium
(9.192GHz) or rubidium
(6.8GHz)
Anything happening in the THz range, that anyone knows of?
--
Robert,
I've just sent a copy of the manual to your email address.
Cheers
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Robert Atkinson
Sent: 19 July 2007 09:10
To: Discussion of precise time and frequency measurement
Subject:
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In a message dated 7/27/2007 06:23:33 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
has the same strength and gas tightness of a cold weld. I've been
fortunate, over the years, to have gotten hold of the right tools and dies
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Just to stir the pot a little - I'm providing a link
to Discover magazine - a tome of great repute and a
source of information on scientific discoveries of
epic magnitude... Enjoy...
http://discovermagazine.com/2007/jun/in-no-time
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Has there been any attempts (or successes) at someone outside of a
national laboratory, and commercial RD groups to build a primary
frequency/time standard?
I am not sure if there is anything that would prevent an individual
from
Hello all together,
nice to find an expert on wiring procedures, all your comments are fully
correct Bruce!
For the Boeing B747/ B727/ B737 etc. we had of course all kind of tools for all
the different MIL a
nd aerospace connectors and wire-types available. Unfortunately these are quite
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Has there been any attempts (or successes) at someone outside of a
national laboratory, and commercial RD groups to build a primary
frequency/time standard?
Two attempts to build hydrogen masers that I know of; little
or no
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Jeffrey,
Got off-list feedback from Chuck Norton yesterday and put power to my
unit. Your pinout worked great with my unit. Thanks again! Initial current
consumption 250mA, later dropped to about 160mA. Fine tune adjustment
worked.
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Wow, as a member of the 5071 cesium RD team, I couldn't imagine
a homebrew cesium standard. There is so much knowledge involved
in building one, plus you need high vacuum equipment, etc. Big
cesiums like NIST-7 have a group of post
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I have a NTS-200 on the way, but one thing about them is their GPS power
output is 12V instead of the usual 5V. I really didn't want to modify the
board any in an irreversible fashion so I was hoping to build an inline
coupler that I
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Use a cheap Mini Circuits Bias-T. Many on ebay. First load the receiver with
whatever it needs to be happy, then go through a Bias-T and put 5 volts in
on the DC port of the bias-T. The 5 volts could be obtained from the 12
volts
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Google a 7805 device and all will be well.
73, Dick, W1KSZ
Jason Rabel wrote:
I have a NTS-200 on the way, but one thing about them is their GPS power
output is 12V instead of the usual 5V. I really didn't want to modify the
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My first thought here would be to use a small 3 pin 5V regulator to drop the
DC down, and then capacitively couple in and out to let the RF through.
Interesting to see what other comments you get.
Rob K
-Original Message-
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Whats the problem disconnecting your antenna from the antenna port on the
Splitter, connect your NTS-200, and then measure the DC-voltage on the
Splitter antenna port?
Maybe you _want_ to build a DC-block... ;-)
--
Björn
On
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Tom,
Very interesting concept ! But I do not think the business world is going to
buy it.
BillWB6BNQ
Tom Clifton wrote:
Just to stir the pot a little - I'm providing a link
to Discover magazine - a tome of great repute
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I actually did just that on one of the HP 8 port splitters that was on
eBay a few months ago. It was configured for external DC but simply
passed the input voltage through untouched. A 78L05 regulator on a
piece of perfboard
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Interesting article.
But I see implications to the idea of time=money.
-Brian, WA1ZMS
-- Original message --
From: WB6BNQ [EMAIL PROTECTED]
Tom,
Very interesting concept ! But I do not think
I have 2 other GPS devices already on the splitter, so there is really no
need for any DC current to be passed as the splitter will just sink it. I
just wanted to build an extra measure of safety in there sinking the 12V
before the splitter *incase* the other 2 GPS devices are turned off or
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In a message dated 7/27/2007 13:10:12 Pacific Daylight Time, [EMAIL PROTECTED]
writes:
I actually did just that on one of the HP 8 port splitters that was on
eBay a few months ago. It was configured for external DC but
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[EMAIL PROTECTED] said the following on 07/27/2007 05:00 PM:
I have one of these Tucker HP 8-ports GPS antenna amps/splitters too, and
they are configured to only accept an external power supply, but can be
easily
modified:
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Jason Rabel wrote:
I have a NTS-200 on the way, but one thing about them is their GPS power
output is 12V instead of the usual 5V. I really didn't want to modify the
board any in an irreversible fashion so I was hoping to build an
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In a message dated 7/27/2007 14:48:20 Pacific Daylight Time, [EMAIL PROTECTED]
writes:
With the external power, I still have a point of failure, but
accidentally turning off a GPS without remembering the consequences
isn't an
Money *does* exist, although not in large enough quantaties to be of much
practical
use, usually...Don C.
- Original Message -
From: [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com; Discussion of precise
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Furthermore : If time=money, and money is in short supply, then there`s
never enough time [to get things done]. This is verifiable empirricly, and
may be the reason why rich people live longer, and why not so productive
workers
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It is possible to build a standard, of very good long term stability, by
amplifying the radiation produced by a simple incandesent light bulb. The
frequency produced is well within the capabilities of present
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I told a fellow co-worker about this thread today and his
comments were:
It's true that Time = Money,
but. Wife = Anti-Money
-Brian, WA1ZMS
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of
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3Tr`s can be very noisy - if the current drawn is constant, perhaps a
decoupled resistor would be better..Don C.
- Original Message -
From: Rob Kimberley [EMAIL PROTECTED]
To: 'Discussion
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Rich people generally live longer because they do 'rich people' stuff...
Live below there means, save, don't use credit; which reduces stress.
Poor people on the other hand, do 'poor people' stuff, like run up credit
cards, borrow
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Before this subject deteriorates into what trial lawyers and
politicians excel at (twisting words to obscure the truth),
consider what happens if time does not exist.
Velocity is distance moved per unit of time, or distance is
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