Mark Sims skrev:
Ahhh, yes... as the Great One once said: If it jams, force it. If it
breaks, it needed fixing anyway...
So my first attempt should be to apply 230 VAC directly, since if it
fails it needs fixing anyway...
Sorry. Broken logic. Try again.
This is one of the fields which
I think Mark was being ironic - i.e. he agrees with you.
D.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: 16 January 2009 09:05
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts]
David C. Partridge skrev:
I think Mark was being ironic - i.e. he agrees with you.
Unfortunately, being ironic on a public email-list or forum needs to be
applied with care. When a less knowing person comes in it can go
terribly wrong in this case. Lack of traditional markings like :- etc
No too mention other people having other mother tongue.
Cheers, Ernie.
-Original Message-
From: Magnus Danielson mag...@rubidium.dyndns.org
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Fri, 16 Jan 2009 10:19 am
Subject: Re: [time-nuts] FTS Datum
Another factor to bear in mind is that some of these older OCXOs used
insulating foams that are chemically unstable.
With age these revert to a sticky mess which should be replaced in any
case, to ensure that the thermal insulation is increased to the design
value.
Thus it can be useful to at
Hi all,
The pinout is known and I have run the unit for a couple weeks at the
+15V and +24V levels which is what the mainframe it came out of supplied.
I'll just end up 3 terminaling to get the +15 from the +24. Just hoped
there were some specs floating around out there!
On another subject I
At 12:22 PM 1/16/2009, Robert Darlington wrote...
Beryliosis.
That's a glib response, which says nothing to contradict Brooke's
point.
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More realistically, the dangeris dust when something is physically overstressed
(dropped, mounting overtightened, thermal shock). That, and if it gets ground
up in trash disposal... Say someone throws it in the shredder.
-Original Message-
From: Mike S mi...@flatsurface.com
To:
Beryliosis.
The problem that I'm familiar with is dust made when machining beryllium. In
the 60s, MIT had a whole building that was full of the stuff leftover from
machining parts for the Polaris guidance system. Beryllium is light and
stiff, good for making gyros.
Beryllium oxide is a
At 12:45 PM 1/16/2009, Lux, James P wrote...
More realistically, the dangeris dust when something is physically
overstressed (dropped, mounting overtightened, thermal shock). That,
and if it gets ground up in trash disposal... Say someone throws it in
the shredder.
So, if some electronics have
I've personally seen three applications of BeO in electronics. Two, including
the most common, are a possible hazzard.
The most common application is RF power devices (transistors and terminating
resistors). These hace a washer or slab of BeO between the semiconductor
device and the mounting
Robert Atkinson wrote:
non-electronic application is in some (eg argon-ion) lasers.
on a side note some vacuum tubes (especially cold cathode types) contain
various radioactive materials.
Robert G8RPI.
Of interest to time nuts is that rubidium standards contain
two isotopes of Rb, one of
Rick Karlquist wrote:
Robert Atkinson wrote:
non-electronic application is in some (eg argon-ion) lasers.
on a side note some vacuum tubes (especially cold cathode types) contain
various radioactive materials.
Robert G8RPI.
Of interest to time nuts is that rubidium standards
Since we're on the subject, what does BeO typically look like when it's used as
a washer, heatsink, etc. I ask because I tend to keep everything and I modify
things all the time. Is there any way besides being painted that it could pass
as Al?
-Dave
Robert Atkinson wrote:
I've personally seen three applications of BeO in electronics. Two, including
the most common, are a possible hazzard.
The most common application is RF power devices (transistors and terminating
resistors). These hace a washer or slab of BeO between the semiconductor
BeO furthermore had been used in some types of RF attenuators, especially
for higher power, as a insulating washer for transistors (High voltage power
transistors, RF terminating resistors, Thermal studs and so on. Although it
is replaced nowadays in most cases by different materials, Beo can be
Robert,
Some power tubesmay use it internally.
As far as I know, from many discussions with power tube
manufacturers, no power tube uses beryllia, except for that
conduction-cooled Eimac tubes. It's simply not needed.
Other tubes (not power ones) may be different, but I never heard of
any
At 20.41 16/01/2009, you wrote:
Since we're on the subject, what does BeO typically look like when
it's used as a washer, heatsink, etc. I ask because I tend to keep
everything and I modify things all the time. Is there any way
besides being painted that it could pass as Al?
-Dave
Exactly
d.sei...@comcast.net wrote:
Since we're on the subject, what does BeO typically look like when it's used
as a washer, heatsink, etc. I ask because I tend to keep everything and I
modify things all the time. Is there any way besides being painted that it
could pass as Al?
-Dave
Dave,
d.sei...@comcast.net wrote:
Since we're on the subject, what does BeO typically look like when it's used
as a washer, heatsink, etc. I ask because I tend to keep everything and I
modify things all the time. Is there any way besides being painted that it
could pass as Al?
-Dave
Three other places one may encounter beryllium are:
1) Beryllium copper springs and contacts, usually around 2-3% beryllium. Not
likely to cause a problem unless you get your jollies grinding up springy
metal and snorting the powder.
2) Beryllium tools! Tools (particularly screwdrivers
Mark Sims skrev:
Three other places one may encounter beryllium are:
1) Beryllium copper springs and contacts, usually around 2-3% beryllium.
Not likely to cause a problem unless you get your jollies grinding up
springy metal and snorting the powder.
2) Beryllium tools! Tools
Oh, and one more place to find pure beryllium in the home... high end stereo
equipment... specifically in speakers and tweeters. For an example of this:
http://www.utopia-be.com/Technology/Beryllium.htm
Couple a few of those with your cesium locked turntable and $100,000 oxygen
free
In message 4970e72d.1050...@rubidium.dyndns.org, Magnus Danielson writes:
I have encountered Beryllium in a field none of you mentioned, as
material for speaker cones. Light and very rigid. Perfect for the top
driver for horns. I recall something about high speed of sound.
It is also used for
In message 22975.1232136...@critter.freebsd.dk, Poul-Henning Kamp writes:
It is also used for mirrors for certain, usually classified,
applications.
Actually, isn't the James Webb space telescope using a Be mirror now
that I think about it ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus
Also used on old lighthouse tubes used for uhf and low microwave applications
fro the '40's and '50's. If my memory serves me, these tubes were found in
devices like the airborne APX-6 IFF Transponder in which the greatest hazard
was the detonators used to destroy the device should a plane go
James Webb space telescope and Utah Beryllium mine
http://heliophysics.org/headlines/y2008/10dec_mirror.htm
On Fri, Jan 16, 2009 at 3:20 PM, Tom Clifton kc0...@yahoo.com wrote:
Also used on old lighthouse tubes used for uhf and low microwave
applications fro the '40's and '50's. If my
I was once told that the white sticky paste put under power
transistors years ago as a heat conduction aid
was dangerous because it was based on berylium oxide
cheers, Neville Michie
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To
Hi Bruce:
Thanks for the MDA Technology link. I didn't know that Beryllium was used to
make mirrors and their metering structures for space apps. It sure sounds like
the best material for that use. I'd bet that's how spy sat mirrors are made.
Have Fun,
Brooke Clarke
http://www.prc68.com
In message 49710157.5030...@pacific.net, Brooke Clarke writes:
I'd bet that's how spy sat mirrors are made.
Your Tax Money At Work Quiz:
1. Why do you think there was so little research involved in the
mirror construction for the Webb Telescope ?
2. Why do you think the KeyHole
Guys, isn't this whole thread getting a bit off-topic.
2009/1/17 Poul-Henning Kamp p...@phk.freebsd.dk:
In message 49710157.5030...@pacific.net, Brooke Clarke writes:
I'd bet that's how spy sat mirrors are made.
Your Tax Money At Work Quiz:
1. Why do you think there was so little research
For $72.95 you can own your very own beryllium mirror Ebay item
350134412234.
Note that all the beryllium tools listed on Ebay are copper or aluminium alloy
non-sparking tools... not those lovely old surplus EOD tools.
_
On 1/16/09 12:34 PM, M. Warner Losh i...@bsdimp.com wrote:
But what about the Beryllium Sphere? What happens when you activate
that?
Warner
The sphere merely provides the power for the Omega 13. That's what gets
activated.
And now that you mention such things, the Omega 13 has effects
Also in the Heath SB-230.
I wish I still had mine.
73, Dick, W1KSZ
-Original Message-
From: WB6BNQ wb6...@cox.net
Sent: Jan 16, 2009 1:52 PM
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Subject: Re: [time-nuts] beryllium oxide
Another place to find it is
Re: Beryllium was originally called glucinium becuase it and its salts
tasted very sweet. In fact, tasting used to be a diagnostic test
for the presence of beryllium.
I remember from my inorganic chem course that lead acetate was also
called sugar of lead because of it's sweet taste. and if
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