In a message dated 12/12/2011 04:00:17 GMT Standard Time, smit...@c-c-i.com
writes:
But you can query the unit and it will reply with the programmed offset
value.
If you get it wrong, it won't accept the programmed value. Just query it
with:
2d 04 00 29 to verify the offset value.
The 74HC series can handle 6V levels too. The 74HCT series is a 5V logic
family.
On Sun, Dec 11, 2011 at 9:38 PM, Stanley timen...@n4iqt.com wrote:
The 74AC175 can not be subituted as the circuit needs the higher voltage
output, contact me off list if you need a few parts, or use the surface
Better use 74HC or 74HCT parts, the 74F should be TTL FAST parts that
require high input current to be driven correctly.
HC/HCT are pretty slow. I'd carefully check the data sheet timings before
substituting for AC.
Yes, F/FAST requires some input current, but I wouldn't call it high.
Yes, your're right: higher than CMOS, I was too high.
On Mon, Dec 12, 2011 at 10:53 AM, Hal Murray hmur...@megapathdsl.netwrote:
Better use 74HC or 74HCT parts, the 74F should be TTL FAST parts that
require high input current to be driven correctly.
HC/HCT are pretty slow. I'd carefully
Jim Lux writes:
intriguing. From your parenthetical remark, I'm assuming you move the
whole assembly up and down to adjust the speed?
I was thinking about a huge mass that moves around?
Got one already -- it's called the moon!
let's see.. period is proportional to sqrt(1/g)
g is
On Sun, 11 Dec 2011 12:04:35 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
It uses a few 74ACxxx locic family parts that are no longer made.
This surprises me a bit. Do you have any references to EOL notices
from the manufacturers? Yes, they are not as easy to find as they
used to be,
On Mon, Dec 12, 2011 at 4:28 AM, Attila Kinali att...@kinali.ch wrote:
On Sun, 11 Dec 2011 12:04:35 -0800
Chris Albertson albertson.ch...@gmail.com wrote:
It uses a few 74ACxxx locic family parts that are no longer made.
This surprises me a bit. Do you have any references to EOL notices
Hi
The part went gone with the wind right as the board was being released
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris Albertson
Sent: Monday, December 12, 2011 12:42 PM
To: Discussion of precise time and frequency
I have two of the FE-5680A (FEI P/N 217400-30352-1) Rb references, and I'm
looking at the signals on digital side of the PCB inside, in particular the
Xilinx CPLD, that is the XC9572XL in a 64-pin package. Here is a photo with
the signals marked:
Was the probe grounded using a spring clip off the probe tip, hitting the
nearest ground that is tied directly to the 9572? If not, the waveform captured
is not the waveform present during operation. Also, using a 10pF probe on a 2ns
risetime signal is quite a heavy load / impedance mismatch.
Hi
If you are getting 11 V p-p, I'd bet you don't have the 10 MHz output
terminated in 50 ohms.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of beale
Sent: Monday, December 12, 2011 1:29 PM
To: time-nuts@febo.com
Subject:
On 12/12/2011 01:37 AM, Jim Lux wrote:
On 12/11/11 4:04 PM, Tom Van Baak wrote:
GCPC -- gravity controlled pendulum clock (elevation)
intriguing. From your parenthetical remark, I'm assuming you move the
whole assembly up and down to adjust the speed?
I was thinking about a huge mass that
Realterm is a good one too:
http://realterm.sourceforge.net/
Cutecom works perfectly:
http://cutecom.sourceforge.net/
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Hi
If you have a mountain nearby, it does indeed impact the local field. I believe
they first measured that in the 1700's.
Bob
On Dec 12, 2011, at 5:19 PM, Magnus Danielson wrote:
On 12/12/2011 01:37 AM, Jim Lux wrote:
On 12/11/11 4:04 PM, Tom Van Baak wrote:
GCPC -- gravity controlled
On 12/12/2011 1:19:31 PM, Magnus Danielson (mag...@rubidium.dyndns.org) wrote:
On 12/12/2011 01:37 AM, Jim Lux wrote:
On 12/11/11 4:04 PM, Tom Van Baak wrote:
GCPC -- gravity controlled pendulum clock (elevation)
intriguing. From your parenthetical remark,
I'm assuming you move the
Aha, there is a near-field for gravity too? Interesting... going to google
for gravitational near-field at once!
On Mon, Dec 12, 2011 at 11:19 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 12/12/2011 01:37 AM, Jim Lux wrote:
On 12/11/11 4:04 PM, Tom Van Baak wrote:
GCPC --
Folks,
Actually, the USGS goes around measuring the local gravitational constant
in various places. There was a gravimeter set up in the basement of one of the
local universities a few years back doing just that. And some time ago, the
U.S. spent a fair amount of time, money and effort
On 12/12/11 2:19 PM, Magnus Danielson wrote:
On 12/12/2011 01:37 AM, Jim Lux wrote:
On 12/11/11 4:04 PM, Tom Van Baak wrote:
GCPC -- gravity controlled pendulum clock (elevation)
intriguing. From your parenthetical remark, I'm assuming you move the
whole assembly up and down to adjust the
On 12/12/11 2:19 PM, Magnus Danielson wrote:
On 12/12/2011 01:37 AM, Jim Lux wrote:
On 12/11/11 4:04 PM, Tom Van Baak wrote:
GCPC -- gravity controlled pendulum clock (elevation)
intriguing. From your parenthetical remark, I'm assuming you move the
whole assembly up and down to adjust the
Folks,
Actually, the USGS goes around measuring the local gravitational
constant in various places. There was a gravimeter set up in the
basement of one of the local universities a few years back doing just
that. And some time ago, the U.S. spent a fair amount of time, money
and
OK, you are referring to the gravitational field just inside the mass as
near field. I was thinking about something like the near EM field.
On Tue, Dec 13, 2011 at 12:46 AM, b...@lysator.liu.se wrote:
Folks,
Actually, the USGS goes around measuring the local gravitational
constant
I blame you all .. I have no reason to get one of the $40 units, but
sigh .. I did.
wonder how many of the 40 odd the seller had, were bought by TN's
-pete
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Hi
My guess is that the supply is in the thousands...
Bob
On Dec 12, 2011, at 7:16 PM, Pete Lancashire p...@petelancashire.com wrote:
I blame you all .. I have no reason to get one of the $40 units, but
sigh .. I did.
wonder how many of the 40 odd the seller had, were bought by TN's
Though I have not purchased one or two and at this point they won't arrive
before Christmas, I suspect that we time nuts really have not made a huge
dent measured by the posts here.
This is indeed one of those deals.
Regards
Paul.
On Mon, Dec 12, 2011 at 7:22 PM, Bob Camp li...@rtty.us wrote:
On Mon, Dec 12, 2011 at 4:22 PM, Bob Camp li...@rtty.us wrote:
Hi
My guess is that the supply is in the thousands...
We don't know the number of units he has but was can see how many were
sold. ebay provides a link to bidding and sales history. I looked
and I say so far dozens not thousands.
Some of the offers include free shipping, others not.
That affects the calculation.
On 12/12/2011 05:42 PM, Chris Albertson wrote:
On Mon, Dec 12, 2011 at 4:22 PM, Bob Campli...@rtty.us wrote:
Hi
My guess is that the supply is in the thousands...
We don't know the number of units he has but
I had thought of doing the same .. but trying trying to keep the junk
pile lower then the roof
On Mon, Dec 12, 2011 at 5:42 PM, Chris Albertson
albertson.ch...@gmail.com wrote:
On Mon, Dec 12, 2011 at 4:22 PM, Bob Camp li...@rtty.us wrote:
Hi
My guess is that the supply is in the
What is the best practice for filtering a 10Mhz sine wave frequency
standard? I've read that you can do more harm than good. Filter
parts (caps, resistors and so on) are all temperature sensitive. But
all those $40 Rb oscillators are putting out a pretty rough looking
sine wave.
Are some types
Hi
There are several dozen listings for the FE-5680's if you count up all the
different sellers, shipping options, and PC board / no pc board choices. My
*guess* is that there are also another batch of listings if you dig into the
European and Asian eBay listings. That's a lot of activity ...
On 12/12/2011 5:54 PM, Chris Albertson wrote:
What is the best practice for filtering a 10Mhz sine wave frequency
standard? I've read that you can do more harm than good. Filter
parts (caps, resistors and so on) are all temperature sensitive. But
all those $40 Rb oscillators are putting out a
Pete I have been trying to keep your pile down.
;-)
If I do buy them it will be a pair also.
Regards
Paul
WB8TSL
On Mon, Dec 12, 2011 at 8:48 PM, Pete Lancashire p...@petelancashire.comwrote:
I had thought of doing the same .. but trying trying to keep the junk
pile lower then the roof
On
I think you would want to avoid crystal filters due to microphonics.
I've found building good LCR filters harder in real life than on paper. (I've
done plenty of leapfrog active filters from LCR based designs.) I've had to
make a passive LCR for ADC testing and secondary (parasitic elements of
If someone says or best offer of course I'm going to make a smaller offer when
multiple items are for sale. This is what the seller is telling you to do.
I bought one and finally tonight hooked it up to see if it ran. After a few
minutes it locked up nice. For the price, I think I will pick
Paul Wade did a paper on 10Mhz GPSDO filtering for Microwave Update in
October. It is in the proceedings. I don't know if it is available
elsewhere.
Bob
On Mon, Dec 12, 2011 at 9:17 PM, li...@lazygranch.com wrote:
I think you would want to avoid crystal filters due to microphonics.
I've
Let's see, arguably the most accurate pendulum clock was the Shortt clock.
It was good to 200 microseconds/day, or about 2 E-9, where you could see
the effect of the moon and the sun, just.
Suppose I have one of those beauties in my basement, with the requisite
apparatus to compare it to a
Interestingly, until there were artificial satellites, you couldn't tell that
the earth is slightly pear shaped.
You need to read Measure of the Earth
N0UU
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Suppose I have one of those beauties in my basement, with the requisite
apparatus to compare it to a Caesium clock disciplined by GPS. Suppose my
wife drives her 3000 pound car out of the garage, about 20 feet away. What
will be the affect of that local change in mass?
Could I discipline a
Instead of a GPS disciplined one ton mass, Huygens used a second clock on his
mantel. The very slight acceleration that each pendulum exerted on the mantel
caused the other clock to displace slightly, so its escapement triggered either
earlier or later, and finally the clocks became
or you can use a cubic yard of plain sand, about 2700# (depends on how
moist it is)
--
Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind.
R. Bacon
If you don't know what it is, don't poke it.
Ghost in the
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