> This is a very interesting thread. When I retired from Western
> Kentucky University in 2001 I was given a very expensive mantel
> clock. Seven day wind up with a balance wheel. I have had a lot of
> fun regulating it over the last 7 years. Right now I have it holding
> within 5 seconds a
Mike S wrote:
> At 06:48 PM 10/22/2008, Bill Hawkins wrote...
>
>> I would not discourage you from looking for an intergalactic cause of
>> jumps, but I think the laws of probability are quite sound.
>>
>
> OTOH, perhaps Yoda is correct - "I feel a disturbance in the force."
> :-)
>
>
>
This is a very interesting thread. When I retired from Western Kentucky
University in 2001 I was given a very expensive mantel clock. Seven day
wind up with a balance wheel. I have had a lot of fun regulating it over
the last 7 years. Right now I have it holding within 5 seconds a month but
Do rubidium standards use an OCXO?
Bob Q.
- Original Message -
From: "Rick Karlquist" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Wednesday, October 22, 2008 2:23 PM
Subject: Re: [time-nuts] Question on crystal jumps
> I'm not quite sure what t
In a message dated 23/10/2008 01:07:43 GMT Daylight Time,
[EMAIL PROTECTED] writes:
There IS a mini-TNC as I recall. My ancient (80s vintage) cellphone had such
a thing on the antenna. There's also something referred to as a mini-UHF
(presumably a small PL-259), but the amphenol catalog
There IS a mini-TNC as I recall. My ancient (80s vintage) cellphone had such a
thing on the antenna. There's also something referred to as a mini-UHF
(presumably a small PL-259), but the amphenol catalog pitures show the serrated
top of the female, and yours are smooth. The thread was 3/8" -24
Hi Björn:
The Pasternack hard copy catalog, or the on line version:
http://www.pasternack.com/pdf/catalog/ConnectorIdentifier.pdf
are a handy reference to identify coax connectors.
It's handy to have a pair of digital vernier calipers with switchable metric
and inch displays to get the key dimen
In a message dated 22/10/2008 22:26:45 GMT Daylight Time, [EMAIL PROTECTED]
writes:
I have a coax connector that I would like to identify. Se attached
picture.
To the left is a female TNC for reference. The unknown male is attached
to the cable. Unknown female to the upper left as part of
Hi,
In : Accurate Clock Pendulums by Robert Matthys (2004) Oxford
University Press ISBN 0198529716, Pp264
In Chapter 8 , "The Allen variance and the rms time error", on page 38
he writes:
Figure 8.1 shows another characteristic of pendulum clocks - the
clock will run relatively
smoothly at one
Hi:
A possible explanation is cosmic rays. The actual particle that gets to the
surface of the Earth is so energetic that it would take a very thick lead
shield to stop them. The Earth has enough mass that they can not go all the
way through. http://en.wikipedia.org/wiki/Muon
So a test woul
At 06:48 PM 10/22/2008, Bill Hawkins wrote...
>I would not discourage you from looking for an intergalactic cause of
>jumps, but I think the laws of probability are quite sound.
OTOH, perhaps Yoda is correct - "I feel a disturbance in the force."
:-)
___
Hello Antonio,
A.W.Ladner and C.R.Stoner in their book "Short Wave Wireless Communication"
describe a phenomenon called "stepping", which may be the same effect as the
jumps you are
investigating.
The book is quite old, 4th edition published in 1942 by Chapman and Hall,
and refers (on page 321)
College freshman physics (in 1955) included a story about the
probability
of all atoms in a chalk board eraser moving the same way at the same
time,
causing it to jump off the board. The incredibly small probability of
that
happening was what kept solid matter apparently inert.
I would not discour
Neville,
> Hi Antonio,
>
> precise pendulum clocks also suffer rate jumps, the process
> of rate jumping seems to be common to most time counting
> systems.
I have an interest in this. May you point me to any references?
73,
Antonio I8IOV
___
tim
> Are you sure it is the tuning fork and not the reference
> for your counter? -
> 73 - Mike
Hi Mike,
the tuning fork jumps were in the order of e-7, while the references were a HP
10811 and a Racal Opt 04E both in the range of e-10.
Thanks and 73,
ANtonio
__
Hi Rick
> I'm not quite sure what the question is here
>
The question is:
may anybody tell me (date and time) when a crystal jumped?
(a sample response could be: my crystal jumped on January 22, 2006 12:25 UT).
I would like to map in time as many jumps as possible.
I hope someone in th
Brian Kirby wrote:
> Might be a SMB.
>
> Björn Gabrielsson wrote:
>
>> Hi List,
>>
>> I have a coax connector that I would like to identify. Se attached
>> picture.
>>
>> To the left is a female TNC for reference. The unknown male is attached
>> to the cable. Unknown female to the upper lef
> Hi Antonio,
>
> precise pendulum clocks also suffer rate jumps, the process
> of rate jumping seems to be common to most time counting
> systems.
Thanks, I was missing this info.
> I have an LPRO rubidium oscillator. I mounted it on a heat
> sink with fins and placed it in an insulated box. A
Might be a SMB.
Björn Gabrielsson wrote:
> Hi List,
>
> I have a coax connector that I would like to identify. Se attached
> picture.
>
> To the left is a female TNC for reference. The unknown male is attached
> to the cable. Unknown female to the upper left as part of a "T" adapter.
>
> I
Are you sure it is the tuning fork and not the reference for your counter? -
73 - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of [EMAIL PROTECTED]
Sent: Wednesday, October 22
I'm not quite sure what the question is here, but when
we made 10811 oscillators at HP, "jumps happened". Some
crystals were better than others, but no crystal was immune
from jumps. With good quality crystals, you might be able
to put an upper bound on the magnitude of jumps, like 10-9,
but not
Hi Antonio,
precise pendulum clocks also suffer rate jumps, the process of rate
jumping
seems to be common to most time counting systems.
I have an LPRO rubidium oscillator. I mounted it on a heat sink with
fins
and placed it in an insulated box. A small (40mm) fan is switched to
control
th
I would be very pleased to know when (date and time) anybody
out there happened to record jumps in frequency of crystals.
I have stable (e-07) tuning forks which happen to jump too,
and I don't understand why, even having under control
temperature and air pressure. Sometimes they return to their
Maybe this could be of interest.
I have an LPRO continuously running since ending last January. Lamp volt was
7.92V.
As of October 22 (today, 9 months later) the voltage is 7.7V.
The voltage dropped by 0.22V.
The VCXO Volt was 6.7V, and now is 6.8V.
It is powered at 24V, and the temperature at th
Lux, James P wrote:
>> That's really kind of funny, in 29 years as an engineer, I have never
>> had an accountant talk to me about design decisions. I tell them what
>> it will cost, and they say ok.
>
>
> Lucky you...
Not luck, but a conscious decision to stay out of consumer
electronics. I
Lux, James P wrote:
...
>>> But not so trivial to provide the DC blocks in the ground side of the coax.
>>> The LNA is almost certainly some MMIC with RF ground==Vss
>> Not any worse than providing the DC block on the center of the coax.
>
> There is a significantly different EMI/EMC impact for
Magnus Danielson wrote:
> Dear Norm,
>
> Norman J McSweyn wrote:
>> Magnus,
>> Thanks for the enlightenment!
>> I modified the driver that NI has on their site. Works. Have been
>> manually setting the trigger levels on the front panel. Now know how to
>> use the -40 to do it.
>
> Great! Happy
On 10/22/08 7:20 AM, "Chuck Harris" <[EMAIL PROTECTED]> wrote:
> Lux, James P wrote:
>>
>>
>> On 10/21/08 9:31 PM, "Chuck Harris" <[EMAIL PROTECTED]> wrote:
>>
>>> Tom Van Baak wrote:
> Both the Trimble and Motorola modules use active antennae with 5V power
> - what I don't know is whet
On 10/22/08 6:04 AM, "Chuck Harris" <[EMAIL PROTECTED]> wrote:
> Matthew Smith wrote:
>> Quoth Chuck Harris at 2008-10-22 15:01...
>>
I'd be interested to know if any antennas are in fact the other
way around. Never even considered that.
>>> It would have been fairly trivial for them
Lux, James P wrote:
>
>
> On 10/21/08 9:31 PM, "Chuck Harris" <[EMAIL PROTECTED]> wrote:
>
>> Tom Van Baak wrote:
Both the Trimble and Motorola modules use active antennae with 5V power
- what I don't know is whether they are the same polarity.
all my trimbles and oncores have +5
Steve Rooke wrote:
> 2008/10/23 Chuck Harris <[EMAIL PROTECTED]>:
>> Matthew Smith wrote:
>>> Quoth Chuck Harris at 2008-10-22 15:01...
>>>
> I'd be interested to know if any antennas are in fact the other
> way around. Never even considered that.
It would have been fairly trivial fo
On 10/21/08 9:31 PM, "Chuck Harris" <[EMAIL PROTECTED]> wrote:
> Tom Van Baak wrote:
>>> Both the Trimble and Motorola modules use active antennae with 5V power
>>> - what I don't know is whether they are the same polarity.
>>
>>> all my trimbles and oncores have +5 on center, ground on shield.
2008/10/23 Chuck Harris <[EMAIL PROTECTED]>:
> Matthew Smith wrote:
>> Quoth Chuck Harris at 2008-10-22 15:01...
>>
I'd be interested to know if any antennas are in fact the other
way around. Never even considered that.
>>> It would have been fairly trivial for them to put a bridge rectif
Matthew Smith wrote:
> Quoth Chuck Harris at 2008-10-22 15:01...
>
>>> I'd be interested to know if any antennas are in fact the other
>>> way around. Never even considered that.
>> It would have been fairly trivial for them to put a bridge rectifier
>> before the amplifier's power stuff, allowing
Dear nuts,
Sorry for this posting, only indirectly related to timing. For a long time
I've been toying with the idea of a web-based Open Hardware Repository, and
now it looks like we could allocate some resources to building it. Here are
some preliminary and unofficial specs:
http://ab-dep-co-ht.w
Dear Norm,
Norman J McSweyn wrote:
> Magnus,
> Thanks for the enlightenment!
> I modified the driver that NI has on their site. Works. Have been
> manually setting the trigger levels on the front panel. Now know how to
> use the -40 to do it.
Great! Happy to help!
> I'll further modify the dri
Hi Brian,
On Wed, 2008-10-22 at 00:46 -0500, Brian Kirby wrote:
> All the antenna's I have played with have been +5 volts for power. Is
> anyone aware of any other voltages ? (I know Garmin used +3V for some)
Antcom antennas are often 2.5V to 24V.
Aeroantenna's standard versions eats 5V to 18V
37 matches
Mail list logo
