I am planning on making a simple NTP server using the Resolution SMT as
the PPS input and a Rb oscillator (or any other 10MHz clock) to clock
the CPU on the computer. If people are interested in a friendly
interface board to the device let me know. My initial interface board
design puts the
On Mon, 14 May 2012 18:01:01 -0400
Joseph M Gwinn gw...@raytheon.com wrote:
Modern outdoor enclosures use a filter of some kind, but the underlying
principle is the same.
I don't know what other types are around, but we use vents with
a gore-tex foil over them. Keeps water out but lets the
On Mon, 14 May 2012 19:01:55 -0400 (EDT)
gandal...@aol.com wrote:
I can't remember now exactly what this stuff was called, but it was
readily available in the UK from both RS and Farnell as an aerosol plastic
spray
that provided a good barrier but was a bit more flexible than the usual
On Mon, 14 May 2012 19:43:47 -0600
Tom Knox act...@hotmail.com wrote:
What type of coating do you recommend? What is the downside of coating all
electronics?
As i wrote before, we usually use Plastik 70 and Urethan 71 for the
stuff that does not need high specs. For those that are under water
I really don't know who actually made it, what we generally used came from
RS Components as an aerosol spray and Farnell carried a similar product.
It was an RS own brand product, indicated as suitable for protecting
circuit boards and probably marked up as something exciting, like printed
Hi Kevin - I have replied direct to your latest email to me and it has not
bounced back but I wonder if you have received it?
Let me have your address and I will airmail the oscillator to you pronto.
Merv VK6BMT
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What type of coating do you recommend? What is the downside of coating all
electronics?
As i wrote before, we usually use Plastik 70 and Urethan 71 for the
stuff that does not need high specs. For those that are under water and/or
more aggresive stuff (like body fluids) we use parylene.
Hi
If you actually have to get the product through full humidity and salt spray
testing *plus* make it work in the real world - go with the Parylene. The two
part urethane coatings are pretty good, the acrylics are nearly transparent.
Bob
On May 15, 2012, at 3:21 AM, Attila Kinali wrote:
On
All,
W.L.Gore and Associates makes a whole line of these things, but I'm not
sure where you go to buy just one.
http://www.gore.com/en_xx/products/venting/protective/index.html?xcmp=ijdgpvmktgurl
73,
geo - n4ua
On Tue, May 15, 2012 at 2:59 AM, Attila Kinali att...@kinali.ch wrote:
On Mon,
Pretty neat snap in vents and all.
Not sure how you buy a few either
On Tue, May 15, 2012 at 8:02 AM, George Dubovsky n4ua...@gmail.com wrote:
All,
W.L.Gore and Associates makes a whole line of these things, but I'm not
sure where you go to buy just one.
At 10:49 AM + 5/15/12, time-nuts-requ...@febo.com wrote:
Date: Tue, 15 May 2012 08:59:04 +0200
From: Attila Kinali att...@kinali.ch
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] wwvb weak on east coast especially when the
On Tue, 15 May 2012 08:35:20 -0400
Joe Gwinn joegw...@comcast.net wrote:
Gore-tex blocks liquid water (and dust), but allows water vapor to
pass, so one can still get pumping and the accumulation of condensed
water. Where are your enclosures used, and how exposed are they?
The most
Hi
Put the box up on a pole where it gets a lot of sun on a regular basis. If
it can breathe it will dry it's self out before a lot of water builds up.
Simple vent hole in the bottom of the box and don't worry about much elese..
Bob
-Original Message-
From: time-nuts-boun...@febo.com
This place has them, plus some other stuff that may be of interest to RF types
building outdoor devices:
http://www.sealingdevices.com/products/gore-vents
Unfortunately it looks like you need to ask for a quote, so they may not be
open to small orders.
Also, McMaster Carr has an assortment of
Hi:
You might consider using a piece Tyvek material. You can get it free from the USPS in the form of a priority mailing
envelope or at a construction site where it's used to warp the outside of houses.
Passes water vapor and air but not water.
Have Fun,
Brooke Clarke
http://www.PRC68.com
CHICAGO (MarketWatch) LightSquared Inc. a venture of hedge-fund manager
Philip Falcone was teetering on the verge of bankruptcy Sunday as talks
with lenders to avoid going bust have faltered, The Wall Street Journal
reports, citing unnamed sources.
Reuters
Hedge fund manager Philip Falcone,
On 5/15/12 9:05 AM, Brooke Clarke wrote:
Hi:
You might consider using a piece Tyvek material. You can get it free
from the USPS in the form of a priority mailing envelope or at a
construction site where it's used to warp the outside of houses.
Passes water vapor and air but not water.
I
Well, remember that Tyvek is not a vapor barrier---that's what makes it so
useful but if you're going to use it I suggest you review partial pressures
and decide if the vapor movement is in the direction you want it!
Lee
- Original Message -
From: Brooke Clarke bro...@pacific.net
To:
Actually, the option to set the PPS width is grayed out and that message is
not supported on the Resolution receivers.
I have caught the receiver doing some more bad things. Twice, it lost lock
for around 16 seconds, reported a bogus time/date (like 2024), and reported
bad UTC
The narrow pulses are easily filtered by the power supply because the frequency
distribution of the power consumption has a much smaller component at 1Hz.
At 1Hz, the power supply filters nothing.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original
The Thunderbolt's output impedance is much less than 10 ohms. However, it is
only necessary to filter the end of the line for a clean pulse.
See http://www.ko4bb.com/Test_Equipment/CoaxCableMatching.php
I used the Thunderbolt's PPS output as a source in those measurements.
Didier KO4BB
Sent
Came to this thread late. Could it be thin because the end output of
even a synchronous dividing chain needs to be resynced to the beginning
to maintain phase?
Don
shali...@gmail.com
The Thunderbolt's output impedance is much less than 10 ohms. However,
it is only necessary to filter the end
Hopefully liquidation will follow soon.
On 05/15/12, J. Forsterj...@quikus.com wrote:
CHICAGO (MarketWatch) A-- LightSquared Inc. a venture of hedge-fund
manager
Philip Falcone was teetering on the verge of bankruptcy Sunday as talks
with lenders to avoid going bust have
Simply dividing the 10MHz by a binary counter and taking the most
significant bit for the PPS leads to a 161.1391mS pulse.
On Tue, May 15, 2012 at 9:26 PM, Don Latham d...@montana.com wrote:
Came to this thread late. Could it be thin because the end output of
even a synchronous dividing chain
On 5/15/2012 2:45 PM, shali...@gmail.com wrote:
The narrow pulses are easily filtered by the power supply because the
frequency distribution of the power consumption has a much smaller
component at 1Hz.
But, since PPS is the leading edge, if the power draw for a longer pulse
width causes
seeing into the future for doing? Equalize the amplitude?
Injecting/reducing the current to adjust the dV/dt? Can you explain?
On Tue, May 15, 2012 at 9:47 PM, Mike S mi...@flatsurface.com wrote:
On 5/15/2012 2:45 PM, shali...@gmail.com wrote:
The narrow pulses are easily filtered by the
Yes, but the point is to not use end-termination for all the reasons
mentioned by others in this thread, such as massive spike in power consumption
once per second, over-voltage spikes if the termination is faulty or
missing, higher ADEV due to power supply modulation, etc etc..
Your test
On 5/15/2012 3:59 PM, Azelio Boriani wrote:
seeing into the future for doing? Equalize the amplitude?
Injecting/reducing the current to adjust the dV/dt? Can you explain?
Once the leading edge has occurred, the only information of significance
has been transmitted. What happens after doesn't
On Tue, 15 May 2012 15:47:46 -0400
Mike S mi...@flatsurface.com wrote:
On 5/15/2012 2:45 PM, shali...@gmail.com wrote:
The narrow pulses are easily filtered by the power supply because the
frequency distribution of the power consumption has a much smaller
component at 1Hz.
But, since
It is worth noting that skipping the end termination is probably a bad idea
when daisy-chaining a signal from one output to more than one device input.
The input at the end of the cable will see a clean rise from zero to 5 V
(or whatever the driver's open-circuit voltage is), but the other inputs
On 5/15/2012 4:19 PM, Attila Kinali wrote:
If the
PPS pulse is short, it contains very little energy, which means
the energy can be supplied by the small capacitors at the output
driver. The longer the pulse gets, the more energy it needs.
The pulse is meaningless. It's only the leading edge
LightSquared Bankrupt, But Spectrum Void Still Beckons
May 15, 2012By: Alan
Cameronhttp://www.gpsworld.com/gps-world-author/alan-cameron-121
LightSquared, the company that mounted a powerful threat to GPS signals,
declared bankruptcy on May 14, after losing a
Not really, your setup requires all inputs except the very last one to be
high-impedance to work, and to have a trigger point of 1.25V as well to work
properly (when used with a proper 50 Ohms source). So no difference there.
So it doesn't make any difference, since the same exact inputs
Mike,
Attila is trying to explain that the leading edge is not what we are
concerned about in this thread (its subject to discussion in other email
threads), it is the effect of what follows after that leading edge, and
propagates
down the power supplies to cause side effects that is
On 5/15/2012 5:14 PM, saidj...@aol.com wrote:
it is the effect of what follows after that leading edge, and propagates
down the power supplies to cause side effects that is being discussed here.
I'm asking What side effects? I haven't seen any mentioned. And
really, if an increase in power
QED: here is a phase noise plot of a 200ms 1PPS pulse showing up in the
phase noise spectrum of a 10MHz source (at 1Hz to 10Hz offsets) because the
unit was providing a 100mA current pulses into the cable, and power supply
modulation of the 10MHz output happened inside the unit.
The pulses
Dear Time-nuts,
I'm going to the NIST seminar this year, anyone else going? Any fellow
time-nuts in Boulder area I should meet and visit?
Cheers,
Magnus
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To unsubscribe, go to
Easy, in a precision lab you NEVER turn off the lights. That causes too big a
temperature shift. In fact, a warm body is a 100 watt heat source. That
extra heat load can easily affect precision equipment. And that's why zombie
technicians are in such high demand... the undead are always
Forgot to mention,
on this list we are often concerned with noise floors of -170dBc or lower,
and stabilities of 1E-013 or lower.
At that level, your scenario of stepping into the room and turning on the
light will likely cause a measurable effect just because of the mechanical
vibration
saidj...@aol.com said:
Also, the Thunderbolt has less than 5 Ohms output impedance, so you get a
reflection going back from the 50 Ohms end-termination anyway because the
impedance is mismatched!
I think that's a different problem.
If the far end termination matches the cable there won't
Yes, you are right of course. My bad. This should have been written as:
The Thunderbolt has less than 5 Ohms output impedance, so if you get a
reflection coming from the cable stubs or non-end-terminated cable back into
the Thunderbolt, then you get ringing on the cable because the
Hi Magnus;
I live in Boulder and would enjoy meeting you.
Best Wishes;
Thomas Knox
Date: Tue, 15 May 2012 23:40:27 +0200
From: mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Subject: [time-nuts] NIST Time and Frequency Metrology Seminar
Dear Time-nuts,
I'm going to the NIST
On Tue, 15 May 2012 16:51:13 -0400
Mike S mi...@flatsurface.com wrote:
On 5/15/2012 4:19 PM, Attila Kinali wrote:
If the
PPS pulse is short, it contains very little energy, which means
the energy can be supplied by the small capacitors at the output
driver. The longer the pulse gets, the
On Wed, 16 May 2012 00:40:07 +0200
Attila Kinali att...@kinali.ch wrote:
Just have a look at [3]. The spurs you see there are most likely
* 60Hz mains
* 120Hz mains (first harmonic)
* a nearby radio station (according to TVB)
Err.. sorry, this should read John Ackermann, not TVB.
On May 14, 2012, at 09:33 , b...@lysator.liu.se wrote:
More modern 3-5.5V into 50ohm, 20us.
http://contracting.tacom.army.mil/majorsys/jab/DAGR%20Interface%20Specification.pdf
Is a similar standard available for the older PLGR devices?
--
Mark J. Blair, NF6X n...@nf6x.net
Jenny Craig?
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saidj...@aol.com wrote:
Yes, but the point is to not use end-termination for all the reasons
mentioned by others in this thread, such as massive spike in power
consumption
once per second, over-voltage spikes if the termination is faulty or
FWIW, the E1938A oscillator control board had a
On Tue, 15 May 2012 16:43:50 -0700, Rick Karlquist
rich...@karlquist.com wrote:
saidj...@aol.com wrote:
Yes, but the point is to not use end-termination for all the reasons
mentioned by others in this thread, such as massive spike in power
consumption
once per second, over-voltage spikes if
On 05/16/2012 01:43 AM, Rick Karlquist wrote:
saidj...@aol.com wrote:
Yes, but the point is to not use end-termination for all the reasons
mentioned by others in this thread, such as massive spike in power
consumption
once per second, over-voltage spikes if the termination is faulty or
FWIW,
The issue is that the overall power drawn at 1Hz can cause stability problems
for all the power supplies, so in the example given by Tom, the power
modulation probably affected the power supplies regulation and it affected the
next pulse, not the first pulse. Since it is continuous pulse train,
Mike, here is the effect of the A/C cycling on and off during a warm spring day
on the delay through a piece of RG-8 cable maybe 3 feet long:
http://www.ko4bb.com/Test_Equipment/data/HP10811-raw.png
The full scale (screen height) is about 5x10 to the -10, the length of the
record was about one
Hi Rick,
one reason why we happy blink at 1/2Hz :)
There are other offendors as well, such as the processor and GPS going
through the hoops once per second, but the 100mA surge from the 1PPS output
driver trumps all else.
bye,
Said
In a message dated 5/15/2012 16:44:08 Pacific
I met Jenny in 1987 - not that skinny at the time :) That was after she
sold the company already.
In a message dated 5/15/2012 16:41:34 Pacific Daylight Time, b...@iaxs.net
writes:
Jenny Craig?
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time-nuts mailing list --
I'll also be there for the seminar.
Dave Bengtson
On Tue, May 15, 2012 at 6:28 PM, Tom Knox act...@hotmail.com wrote:
Hi Magnus;
I live in Boulder and would enjoy meeting you.
Best Wishes;
Thomas Knox
Date: Tue, 15 May 2012 23:40:27 +0200
From: mag...@rubidium.dyndns.org
To:
Absolutely, that's what the pictures I linked to earlier show, particularly the
last one. It is sufficient to properly terminate one end to eliminate ringing,
as long as you have no tees in line. There may be specific reasons why it is
preferable to terminate one end rather than the other, like
On 5/15/2012 8:58 PM, shali...@gmail.com wrote:
Mike, here is the effect of the A/C cycling on and off during a warm
spring day on the delay through a piece of RG-8 cable maybe 3 feet
long:
You're comparing the effect of voltage droop due to a 10W load on a 120V
(or 240V, for Euros) AC feed
For what it's worth, that seems to be the standard way to distribute analog
video (composite or component). A low-impedance voltage source with a gain
of 2 drives a bunch of outputs with an individual 75 ohm series resistor
for each output. Each cable that is connected to an output has a
rich...@karlquist.com said:
FWIW, the E1938A oscillator control board had a happy light LED that
flashed 1 time per second, and sure enough this corrupted the power supply
and affected some applications. We added a command to turn it off.
Why should lights blink when they are happy?
Your
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