Jim Lux
The very one...
Don
> Was that the same Boys who invented the Boys camera used to take
> lightning photographs? It's a sort of rotating drum streak camera.
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to
> https:/
Longbow, for very long fibres :)
Yes it was. He was the epitome of the experimental physicist who was also a
master instrument maker.
Boys also wrote an entertaining book on soap bubbles & surface tension
where as a demonstration he makes a mechanical amplifier using sound to
trigger a stream of d
It's in the section on lock in amplifiers I think. The switch has a clever
3 way action I think but I can't quire remember how it works. I do remember
thinking how ingenious it was at the time, since I was designing lock in
amplifiers for detecting optical absorbance over 10cm path lengths using
ph
On 12/12/13 4:28 PM, Tom Harris wrote:
The eccentric English physicist Boys made quartz fibres by attaching one
end to a crossbow bolt, heating the middle and then firing the bolt, at
what I have been unable to determine. He used this to measure the
gravitational constant by suspending iron spher
:Hi Tom:
I can't find anything in the Table of Contents or in the index.
Can you tell me the page or title of the writeup?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Tom Harris wrote:
There is a good writeup of the Dicke switch in Horowitz
There is a good writeup of the Dicke switch in Horowitz & Hill "The Art of
Electronics", since Horiwitz is a radioastronomer of note. I've just bought
my daughter a copy for Xmas, poor girl, she wants to be an engineer...
Tom Harris
On 11 December 2013 13:02, Don Latham wrote:
>
> Brooke Cla
Jim
I can add some info here. What you suggest is a reasonable conclusion. On
some RB modules but I do not believe on the FE-5680s there is a true lamp
voltage and its very helpful in determining if the lamps old enough that as
you say its dark.
On those units if you are below 4 volts approx you kn
The eccentric English physicist Boys made quartz fibres by attaching one
end to a crossbow bolt, heating the middle and then firing the bolt, at
what I have been unable to determine. He used this to measure the
gravitational constant by suspending iron spheres from the resultant fibre,
which of cou
OK will add my 10 cents. Half the fun is building your homebrew $1.98 ref
with NTP.
Simply toss it on a 2 or 3 ru rack panel. The servers these days are itty
bitty.
Now for serious class follow Jims guidance.
Regards
Paul
On Thu, Dec 12, 2013 at 10:07 AM, Jim Lux wrote:
> On 12/12/13 6:31 AM, B
Yes, "engineering samples" should be approached with caution. Nothing like
spending a lot of money to have a very expensive upside down dish to put jelly
beans in. Besides, a couple of these antennas are listed on eBay for slightly
more cost if you do a "Oncore 2000 antenna" search and one cho
The FE5680A has about ten years of history on time-nuts. The FEI webpage
bears little resemblance to most of the units that you will find. I have
never seen one with a factory separate connector for oscillator output.
Many needed both 15V and 5V to operate. Different versions have outputs
for
Hi,
I’m an elderly time-nut newby, and I’ve already struck trouble with a used
FE-5680 Rb-vapour reference
I bought via eBay. It runs (from +16V and +5V), and the current drain starts at
1.75A and then drops over
5 minutes or so down to about 650mA. But it won’t lock, even if I leave it
powered
This should be equivalent to the Synergy Timing 3000 antenna:
http://www.synergy-gps.com/images/stories/pdf/anttiming3000_tn888.pdf.
David N1HAC
On 12/12/13 2:59 PM, Dave Brown wrote:
They do ship internationally but to a limited number of countries. For
some reason the UK is not on the list
They do ship internationally but to a limited number of countries. For some
reason the UK is not on the list of those they will ship to. See their
website under the 'shipping' tab.
DaveB, NZ
- Original Message -
From: "Robert Atkinson"
To: "Discussion of precise time and frequency mea
On 12/12/2013 1:29 PM, Robert Atkinson wrote:
I know Goldmine would not sell duff stuff knowingly, but the "Engineering
Sample" label worries me a little. Often this is indicates a non-functioning item
for display or trial fit purposes. Then again it maybe not.
I wondered about that as well,
Hi Pee:
Here's some vocabulary to help you.
The 8040c is a frequency standard, not a GPSDO. That's to say it doesn't have a GPS receiver built in, but instead
requires an external 1 PPS input.
It's very similar to the Stanford Research PRS-10 in that respect.
http://www.prc68.com/I/PRS10.shtm
I know Goldmine would not sell duff stuff knowingly, but the "Engineering
Sample" label worries me a little. Often this is indicates a non-functioning
item for display or trial fit purposes. Then again it maybe not. I can't find
out as they don't ship outside the USA.
Robert G8RPI.
_
Sidney
there are to many versions to count. But if you do not have 10 MHz on the
DB9 pin 7 you should check if the XTAL Osc. is 60 MHz. You can bring 60
MHz out or divide internally make sure you divide first by three followed by
a divide by two to get a symmetrical output.
Also check the R
On 12/12/13 6:31 AM, Brian Lloyd wrote:
I am currently using both Trimble Thunderbolt and LPRO-101 Rb references.
What I really would like to have is a rack-mountable unit that is a
GPS-disciplined Rb reference and a built-in NTP server. (Yes, this is for
my home. We are time-nuts, aren't we?) I
I am currently using both Trimble Thunderbolt and LPRO-101 Rb references.
What I really would like to have is a rack-mountable unit that is a
GPS-disciplined Rb reference and a built-in NTP server. (Yes, this is for
my home. We are time-nuts, aren't we?) I could roll-my-own system for
disciplining
Hi all,
I recently bought a second-hand FE-5680A for some light
experimentation via ebay.
There seems to be a number of variants floating around. Mine in
particular lacks a J2 (where I would expect to see the 10 MHz
connector), so I only have the DB9 J1 connector.
The unit is working, If I suppl
Welcome to the list. Congratulations on your masters effort. Which school?
There is no way the 8040c can make a claim about output accuracy without some
assumption about the short- and long-term quality of the 1PPS reference input.
They just mention "GPS" so your question is a good one. But it's
I'm currently doing my master's thesis on GPSDO devices. Nothing fancy but
more than enough for a fledgling time-nutter. It seems that which ever
direction I go with my master's, this place always pops up :)
I'm a bit uncertain about how to interpret one of the GPSDO's
specifications. The device i
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