On 19/02/13 07:36, Stewart Cobb wrote:
Guys,
I'm repairing a 1960's vintage lab-grade rubidium standard, General
Technology Corporation model 304-B. Apparently Tracor bought GTC soon
after this unit was made, because references to this as a Tracor 304-B
seem to be more common. I've made some
Hi
Keep in mind that the Tracor's came out before the Teflon coated bulbs. Without
the Teflon, the Rb will combine with the glass of the bulb. The ones I have
seen slowly turn a black. As they darken, the light transmission drops enough
to stop the standard. Since it's a chemical reaction,
Stewart,
Tracor units use a high voltage pulse to start the lamp. You should be
able to hear the relay that drives the pulse clicking around every 10
seconds or so until the lamp lights up.
Tracor lamp failures are not rejuvinatable (is that really a word).
However I have in the past
Hi
Of course, depending on the age of an Efratom lamp - it's also missing the
Teflon. I've certainly replaced enough of them. Since it's a combo gas lamp,
you can get away without all of the stuff in the 304 when you do the
replacement.
Bob
-Original Message-
From:
On our favourite auction site is the pulse clock system used at the
BBC's old World Service Radio headquarters, Bush House, in London,
including a lot of units with Patek Philippe clocks! See ebay item
number 140912029728.
I have no connection with this item, just thought some rich member of
the
On Mon 2013-02-18T21:48:55 -0800, DaveH hath writ:
Full details of the upcoming meeting are available via
http://futureofutc.org/
Love the graphic on the website.
The use of a Foucault Pendulum with Earth as the bob is inspired...
Credit for the graphic goes to Pete Marenfeld at NOAO, a
Nice though will have to pass today.
Regards
Paul
WB8TSL
On Tue, Feb 19, 2013 at 11:10 AM, Peter Vince pvi...@theiet.org wrote:
On our favourite auction site is the pulse clock system used at the
BBC's old World Service Radio headquarters, Bush House, in London,
including a lot of units with
Hi Peter:
He's also got a larger system at item No. 140912029500 that needs some work,
see the video at the bottom of each auction.
http://www.youtube.com/watch?feature=player_embeddedv=Vnqy99Kowcs
http://www.youtube.com/watch?v=siLG4fjSg3slist=UUzyU78k95mbYA-hZQZCMYIQ
Have Fun,
Brooke
Hi Stu,
Did you find the long message threads from April May of last year
where I was trying to fix my 304-B? Look for Antique Rubidium
Standard, General Technology Corp model 304b and Antique Rb
Standard. Lots of good info from guys like Magnus Danielson, Paul
Swed, Ed Breya and others.
On 19/02/13 19:36, Ed Palmer wrote:
Hi Stu,
Did you find the long message threads from April May of last year
where I was trying to fix my 304-B? Look for Antique Rubidium
Standard, General Technology Corp model 304b and Antique Rb
Standard. Lots of good info from guys like Magnus Danielson,
Actually I guess I do have a further comment. These Pateks look cheap
compared to the old hp5060 24 hour clock versions.
On Tue, Feb 19, 2013 at 1:23 PM, Brooke Clarke bro...@pacific.net wrote:
Hi Peter:
He's also got a larger system at item No. 140912029500 that needs some
work, see the
FYI, from another list. Contact OP directly, not me.
-John
===
Original Message
Subject: [TestEquipTrader] FTS-4060 Cesium Time and Frequency Standard
From:Chris Howard w0ep w...@w0ep.us
Date:Tue, February 19, 2013
Paul,
I doubt Patek makes ANYTHING a mere mortal would call 'cheap'.
YMMV,
-John
=
Actually I guess I do have a further comment. These Pateks look cheap
compared to the old hp5060 24 hour clock versions.
On Tue, Feb 19, 2013 at 1:23 PM, Brooke Clarke bro...@pacific.net wrote:
Totally agree. But the old HPs were a lot nicer looking for the $$
Still have not figured out how you would use one of those as a wrist watch.
On Tue, Feb 19, 2013 at 5:12 PM, J. Forster j...@quikus.com wrote:
Paul,
I doubt Patek makes ANYTHING a mere mortal would call 'cheap'.
YMMV,
A desk clock is more like it.
-John
Totally agree. But the old HPs were a lot nicer looking for the $$
Still have not figured out how you would use one of those as a wrist
watch.
On Tue, Feb 19, 2013 at 5:12 PM, J. Forster j...@quikus.com wrote:
Paul,
I doubt Patek makes
Hello Folks,
I am working on a project intended to convert an analog ECG signal to a voltage
proportional the heart rate,
The actual electrodes instrumentation amp is pretty much working fine so no
worries there.
The problem is, and here is where the relationship to time nut comes in.
The
On Tue, Feb 19, 2013 at 04:58:04PM -0800, Paul Cianciolo wrote:
Hello Folks,
First, I cannot speak for the list, as I'm quite new here,
but in general 'Thread Hijacking' is frowned upon :)
(read: start your own thread :)
I am working on a project intended to convert an analog ECG
signal to a
Hi
The first layer to the onion is that the ECG signal is a bit complex. There's
also likely to be a bit of this and that on it.
How about taking the output of the instrument amp into the A/D port on a cheap
PIC? That would let you do some AGC and dynamic filtering. At even a modest
sample
pa...@snet.net said:
The actual electrodes instrumentation amp is pretty much working fine so no
worries there.
My first tthought was a frequency to voltage IC like the LM2907 or the 2917
but I get the impresiion from the data sheets that these chips will not work
at these very low 1 Hz
Paul,
I use a picPET (http://leapsecond.com/pic/) to measure heart rate and
stability; the original 1PPS... The idea is simply to time-stamp every beat
and then convert that raw data to rate or period or moving average rate, etc.
/tvb (iPhone4) LA
On Feb 19, 2013, at 4:58 PM, Paul Cianciolo
You can buy it for $8 COTS.
You clean up the QRS waveform with a one-shot then integrate to get rate.
- Original Message -
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, February 19, 2013 8:23 PM
Subject: Re:
The most straightforward method these days would be a small
microcontroller implementing a pulse width modulation digital to
analog converter.
The analog route is pretty easy though. A traditional charge or
current pump can operate down to 30 Hz but will have an output ripple
versus settling
On 2/19/13 4:58 PM, Paul Cianciolo wrote:
Hello Folks,
I am working on a project intended to convert an analog ECG signal to
a voltage proportional the heart rate, The actual electrodes
instrumentation amp is pretty much working fine so no worries
there.
The problem is, and here is where the
On Feb 19, 2013, at 5:38 PM, Hal Murray hmur...@megapathdsl.net wrote:
pa...@snet.net said:
The actual electrodes instrumentation amp is pretty much working fine so no
worries there.
My first tthought was a frequency to voltage IC like the LM2907 or the 2917
but I get the impresiion
Good morning Paul,
First: I almost spilled my coffe as you bear a similar last name as a
guy at a national research lab who does exactly such things :)
Even when it makes your ECG preamplifier free for other things, I advise
you to use another sensor and put a lot of decoding and interpretation
On 20 February 2013 00:58, Paul Cianciolo pa...@snet.net wrote:
The purpose of this apparatus is to print a rolling chart on the screen of a
computer of heart BPM and then try different technicues of meditaion and
calming technicues to lower my heart rate for short periods of time.
Just a
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