The following paper indicates how to optimise the voltage drops in
electrical leads for both cryogenic and other applications:
http://arxiv.org/pdf/cond-mat/0508697.pdf
Bruce
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
On 28/06/2008, at 1:14 PM, Bruce Griffiths wrote:
Stainless is trickier to solder than constantan.
Welding may be preferable.
A hint for soft soldering stainless steel, iron, nickel, chromium,
copper, brass, nichrome etc. but not aluminium.
Apply a very small amount of phosphoric acid
G'day fellow time-nuts.
I was just going through some old projects and found my old home-made
mass spectrometer. This was a project based on a design from either
Scientific American or The Amateur Scientist back in the '60s. I was
wondering if anyone here had heard of a similar project for a
This is a chicken vs egg sort of problem. When I took apart the oven
on my 5065A rubidium, it looked to me as though the enamel insulated
nichrome wire developed a short about 50% into the coil, and wiped out
the transistor. It also heated the rubidium lamp hot enough to reflow
the solder on its
Bruce Griffiths wrote:
The following paper indicates how to optimise the voltage drops in
electrical leads for both cryogenic and other applications:
http://arxiv.org/pdf/cond-mat/0508697.pdf
Bruce
Equation 4 in the above reference should be divided by e (electron charge).
The extension
swingbyte wrote:
G'day fellow time-nuts.
I was just going through some old projects and found my old home-made
mass spectrometer. This was a project based on a design from either
Scientific American or The Amateur Scientist back in the '60s. I was
wondering if anyone here had heard of a
Chuck Harris wrote:
This is a chicken vs egg sort of problem. When I took apart the oven
on my 5065A rubidium, it looked to me as though the enamel insulated
nichrome wire developed a short about 50% into the coil, and wiped out
the transistor. It also heated the rubidium lamp hot enough to
Bruce Griffiths wrote:
Chuck Harris wrote:
This is a chicken vs egg sort of problem. When I took apart the oven
on my 5065A rubidium, it looked to me as though the enamel insulated
nichrome wire developed a short about 50% into the coil, and wiped out
the transistor. It also heated the
Hi Everyone,
Here are some links to pictures of the GPS' and the manual. I've gotten alot
of response from people looking for the manuals and photos. I appologize for
not posting links in my original email.
Pleass feel free to contact me with any questions or concerns
From: Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] Home built cesium clocks???
Date: Sun, 29 Jun 2008 01:52:36 +1200
Message-ID: [EMAIL PROTECTED]
swingbyte wrote:
G'day fellow time-nuts.
I was just going through some old projects and found my old home-made
mass
Scott,
What is the synthesizer output on these? It appears to be factory
fixed. How will you handle orders?
Thanks,
J.D.
Scott A Sybert wrote:
Hi Everyone,
Here are some links to pictures of the GPS' and the manual. I've gotten alot
of response from people looking for the manuals
The heater winding for my 5061A crystal oven doesn't seem to be bifilar
wound, but it's a little difficult to tell. Since the heater works, I
don't want to risk poking around too much. However, one lead comes in
at one end, the other lead is at the other end.
BTW, my oven failed
Some references also mention some flip coil in between microwave
cavities. Does anyone knows what it is?
Predrag Dukic
PS: I will make one myself one day. For the moment I am tinkering
with one FE5440a, and have also 6 (six) spare tubes.
First step is to replace the original electronics, and
Microwave components are now cheap and easy to fabricate (thanks to
millions of GSMs GPSs and sat receivers).
Optical pumping/detection is difficult because optical frequencies
(hundreds of THz) have to be accurate and stable within 100khz (1
MHz at worst).
Cesium itself is also difficult
Hi J.D.,
I'm not going to pretend to know a whole lot about these units. I'm not a big
time guy but knew the time arena would definately be interested in them. As
far as outputs, etc... Whats in the manual is all I can offer for information.
I can tell you they are NOS and all lock up like
Hi Guys...
A number of you have been inquiring about additional specifications on these
units.Here's what I've found. It looks like it may address some of your
questions. I think this is all I'm going to be able to turn up on these units.
Most of the data we had on them is long gone.
On Sat, 28 Jun 2008 20:57:51 +1000, Neville Michie [EMAIL PROTECTED] wrote:
On 28/06/2008, at 1:14 PM, Bruce Griffiths wrote:
Stainless is trickier to solder than constantan.
Welding may be preferable.
A hint for soft soldering stainless steel, iron, nickel, chromium,
copper, brass,
Hi John, thanks for the info, I was unaware of that product.
For aluminium I used a soldering iron and flooded the site with
rosin-cored solder,
scrubbing the iron over the surface to scratch it clean under the
iron under the rosin.
Not a good technique and not good for hi-tech iron plated
Predrag Dukic wrote:
Microwave components are now cheap and easy to fabricate (thanks to
millions of GSMs GPSs and sat receivers).
Optical pumping/detection is difficult because optical frequencies
(hundreds of THz) have to be accurate and stable within 100khz (1
MHz at worst).
Cesium
The GPS-4 manual is on my web site. Search for GPS-4
http://www.ko4bb.com/cgi-bin/manuals.pl
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Scott A Sybert
Sent: Saturday, June 28, 2008 3:24 PM
To: time-nuts@febo.com
Subject:
On Jun 23, 2008, at 5:29 AM, Magne Mæhre wrote:
Matthew Smith wrote:
Hi Folks
Does anyone know the current status of NTPD with NMEA PPS
drivers on
OpenSolaris?
Disclaimer: I work for Sun Microsystems, and may be biased...
Hi Magne!
Disclaimer here as well. I am speaking for
21 matches
Mail list logo
