Hi Giuseppe,
Welcome to the group.
If you are already happy constructing equipment and have basic test gear
('scope, DMM) and a small budget, I'd suggest a timing GPS as a starting point.
While a Thunderbolt will give most of what you want, it is more expensive. A
Timing version or Motorola's On
Hi,
2009/12/27 Bob Camp :
> Tough to beat a self winding quartz wrist watch, unless it's not accurate
> enough to do what you need to do.
And perhaps that's the point we sometimes miss.
73
Steve
--
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks
Giuseppe Marullo wrote:
Hi all,
just subscribed, I would like a quick advice on a 10MHz reference for
calibrating my instruments and for fun. In particular, I would like to
know if you could give me advice on EFRATOM FRS-A,FRS-C, DATUM LPRO-101,
Thunderbolt and such.
I would prefer a GPSDO (
Hi
But being *rational* about all this takes out most of the fun
Bob
On Dec 28, 2009, at 5:30 AM, Steve Rooke wrote:
> Hi,
>
> 2009/12/27 Bob Camp :
>
>> Tough to beat a self winding quartz wrist watch, unless it's not accurate
>> enough to do what you need to do.
>
> And perhaps that'
Hi,
Sorry if this question is a bit out of place. It is not about timing, but
more an electronics thing. But searching for Racal 1992 seems to get a lot
of hits here on this list.
I have just received a used Racal 1992 counter and are checking it for
proper operation. All seem fine except the chan
Hi Robert,
Will the Motorola that You have mentioned give a 10.00 MHz output standard.
Thank You
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Robert Atkinson
To: Discussion of precise time and frequency measurement
Cc: gi
Robert,
Welcome to the group.
Thank you and all the others, you are giving me a lot of informations. BTW, my
provider retrieved my emails so I am fully operational (at least I hope).
while I did not originally envision building this kind of equipment, I
could do it while it lies well within
Does the factory sell direct in small quantities ?
73, Dick, W1KSZ
-Original Message-
>From: Eamon Skelton
>Sent: Dec 28, 2009 6:15 AM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] Timenoob - Cheap and simple 10MHz reference
>
>Giuseppe Marullo wro
Hi
With all the dialog on controlling temperature of the Rb unit I decided to
take my Frequency Electronics Inc. 5062B apart since the Oven Controlled
Oscillator and Rb Physics Package are separate and I may want to replace the
oscillator with a HP 10811 that Corby has tested to be better tha
I was wondering the same myself and found they are sold online at:
http://secure.conwin.com/cgi-bin/store/cp-app.cgi?usr=51H4350135&rnd=7294697&rrc=N&affl=&cip=92.132.242.176&act=&aff=&pg=cat&ref=navsync&catstr=
- Original Message -
From: "Richard W. Solomon"
To: "Discussion of precise
Richard W. Solomon wrote:
Does the factory sell direct in small quantities ?
73, Dick, W1KSZ
I don't think so. I live in Cork, Ireland. Navsync are in Shannon about
70 miles from here. I ordered my CW12-TIM from Cutter Electronics in Australia.
As they were out of stock at the time, I had to w
Hi Sal,
No it does not have a 10MHz output. However to calibrate an oscillator that is
very close to 10MHz you can use the 1PPS output to adjust it exactly. Trigger a
'scope with the 1PPS while monitoring the 10MHz, adjust the oscillator for
minimum drift across the screen.
Robert.
--- On M
Maybe a GPSDO myself, who knows...wondering if this could be done all digital,
without using a DAC, without using a driving voltage for a OCXO.
Giuseppe
Symmetricom made a OXCO that had the DAC built-in so it was controlled by a
digital interface. But it is hard to find, seen them on ebay b
Thank You Robert for the quick response.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
From: Robert Atkinson
To: Discussion of precise time and frequency measurement
Sent: Mon, December 28, 2009 12:07:21 PM
Subject: Re: [time-nu
> Does the factory sell direct in small quantities ?
>From here (California), googling for >Navsync CW12-TIM< finds:
http://www.semiconductorstore.com/pages/asp/supplier.asp?pl=0138&gclid=CL_G5ar
W-Z4CFU1M5Qod1XNWLA
(Sorry for the line wrap.)
--
These are my opinions, not necessarily my emplo
Fellow Time-Nuts--
Mark Sims posted a screen capture of his Lady Heather
screen display. In the interest of comparing my LH
screen display to what others see, could I impose on
some other list members to send me a screen capture
of their LH screen display?
Or-- if you are using the LH v3.0 bet
Hi
The short term stability *may* improve with temperature stabilization, even if
the static temperature performance is fairly good.
Since all of the rubidium guys sell parts with many different options. Trying
to find out exactly what the rubidium you have in your hand does can be
difficult.
Hi
The oscillator tempco shown on the screen is -1.6 ppb per degree C. 1/10 of
that would be 0.16 ppb/C. I would hope that the oscillator in your Thunderbolt
is much better than that.
I suspect that the temperature cycling has the poor little gizmo a bit confused.
Bob
On Dec 28, 2009, at 11
Thanks Bert
In a message dated 12/28/2009 12:48:20 P.M. Eastern Standard Time,
li...@cq.nu writes:
Hi
The short term stability *may* improve with temperature stabilization,
even if the static temperature performance is fairly good.
Since all of the rubidium guys sell parts with many
One thing to keep in mind about the CW-12 is that the version they're selling
now runs NMEA software only - which means no TRAIM functionality. If you do
manage to find the Motorola version to get TRAIM, you lose the ability to
change the oscillator frequency. It's fixed at 10 MHz.
I bought m
The HP 10811A (generally regarded as a pretty good oscillator) has a spec of
4.5E-9 over 70C which is 6.4E-11/C. If I'm reading my notes correctly, that
tbolt oscillator measured at 1.4732E-10 parts/C... about 2.3 times worse than
a 10811A.
Generally Thunderbolt oscillators have rather cra
> Tough to beat a self winding quartz wrist watch, unless it's not
> accurate enough to do what you need to do.
I thought the self-winding watches were mechanical and that quartz watches
ran off batteries.
Did I miss something?
--
These are my opinions, not necessarily my employer's. I hat
Hi
There is a sub-species of quartz watch that is indeed self winding. Seiko makes
them in competition to Citizen's solar charging quartz watches.
Bob
On Dec 28, 2009, at 2:00 PM, Hal Murray wrote:
>
>> Tough to beat a self winding quartz wrist watch, unless it's not
>> accurate enough to do
Hi
It's a pretty good bet that at 10 minutes the OCXO is still trying to stabilize
from a temperature step.
Do you know which oscillator your Tbolt has in it? There have been several
different ones used over the years. Some are better than others ...
Bob
On Dec 28, 2009, at 1:45 PM, Mark Sim
- Original Nachricht
Von: Bruce Griffiths
An: Discussion of precise time and frequency measurement
Datum: 28.12.2009 06:52
>
> An inductor in series with the 220 ohm emitter resistor will improve the
> phase noise floor.
In theory, yes. But already with only 220 Ohms,
Mark
In part it depends on your TC and Damping settings as well as how sensitive
your Osc is to temperature.
And just as important is how well your temperature controller is really
doing at holding the OXCO's temperature.
From what I've seen, It is just as likely the Fourier spike AND the Temp
Thanks again to all for helping to identify these parts.
If anybody is interested in some of them, drop me a line and I'll make you a
deal!
-Pete
On Dec 7, 2009, at 12:38 AM, Peter Loron wrote:
> I have recently acquired a number of nice coax parts, but I'm not sure
> exactly what connector t
> Fellow Time-Nuts--
>
> Mark Sims posted a screen capture of his Lady Heather
> screen display. In the interest of comparing my LH
> screen display to what others see, could I impose on
> some other list members to send me a screen capture
> of their LH screen display?
>
> Or-- if you are using
li...@cq.nu said:
> There is a sub-species of quartz watch that is indeed self winding.
> Seiko makes them in competition to Citizen's solar charging quartz
> watches.
Thanks.
Now that I know what to look for...
http://en.wikipedia.org/wiki/Automatic_quartz
--
These are my opinions, not n
Giuseppe Marullo wrote:
Robert,
Welcome to the group.
Thank you and all the others, you are giving me a lot of informations.
BTW, my provider retrieved my emails so I am fully operational (at
least I hope).
while I did not originally envision building this kind of equipment, I
could do it
dk...@arcor.de wrote:
- Original Nachricht
Von: Bruce Griffiths
An: Discussion of precise time and frequency
measurement
Datum: 28.12.2009 06:52
An inductor in series with the 220 ohm emitter resistor will improve the
phase noise floor.
In theory, yes. But alr
I'm on the so-called 'Economy 7' electric in the UK, where I'm supposed to get
cheap electric from 0030 to 0730 - i.e. a 7 hour period when electricity demand
is low. I'm no longer heating by electric, but do run some computers 24/7. It's
not totally clear whether this saves me money or costs me
It is possible the crystal has succumbed to a mechanical fatigue. To check I
used an old relay coil with a ferrite rod stuffed through it and tuned to
32.6khz. If you have a sensitive enough counter you may be able to measure this
without an amp in line. (2% is a long way out !) It could also be
> Von: Magnus Lindahl
> Do you have schematics, PCB-design etc. to share on your design with 3*
> BF862?
I will publish the results in Dubus. (www.dubus.org)
board size is 1.5 * 2.5 inch for oscillator, buffer, reference conditioner and
PLL.
No soldering without a microscope, however. Lots
ALAN MELIA wrote:
It is possible the crystal has succumbed to a mechanical fatigue. To check I used an old relay coil with a ferrite rod stuffed through it and tuned to 32.6khz. If you have a sensitive enough counter you may be able to measure this without an amp in line. (2% is a long way out !)
Dr. David Kirkby wrote:
ALAN MELIA wrote:
It is possible the crystal has succumbed to a mechanical fatigue. To
check I used an old relay coil with a ferrite rod stuffed through it
and tuned to 32.6khz. If you have a sensitive enough counter you may
be able to measure this without an amp in lin
Bruce Griffiths wrote:
If the trimmer in in series with the crystal and not shunted by another
capacitor then the crystal will no longer control the oscillator frequency.
0.1pF or 0.01pF in series with a tuning fork crystal instead of the
nominal value (20pf?) will make a singnificant differenc
Hi
Even with a tuning fork crystal, anything past about 0.2% is a very large
changel. That's true for tuning and also true for normal aging.
I suspect that something mechanical has happened.
1) A cracked crystal - unlikely
2).An electro magnet in the driving circuit no longer firing fully.
Hi David at 17 years the probably NiCd batts may have one at zero volts and the
charge is constant curent so the clock supply will not be held up by the
charger. My timer used alkalines and I replaced every 5 years.
Alan G3NYK
--- On Mon, 28/12/09, Dr. David Kirkby wrote:
> From: Dr. David K
Bob Camp wrote:
Hi
Even with a tuning fork crystal, anything past about 0.2% is a very large
changel. That's true for tuning and also true for normal aging.
I suspect that something mechanical has happened.
1) A cracked crystal - unlikely
2).An electro magnet in the driving circuit no longe
ALAN MELIA wrote:
Hi David at 17 years the probably NiCd batts may have one at zero volts and the
charge is constant curent so the clock supply will not be held up by the
charger. My timer used alkalines and I replaced every 5 years.
Alan G3NYK
A recent power failure did not cause the clock
Hello, Time-Nuts--
Many thanks to Warren S for sending me over 20
Lady Heather screen-captures showing different
configurations!! I really appreciate seeing these
and welcome anyone else on the list sending me
their screen captures. John Miles commented that
individual screenshots may not be ve
> One mystery is that once or twice daily, the
> temperature graph exhibits a sharp, almost perfectly
> vertical spike which recovers over a period of a
> few minutes. The temperature cannot possibly change
> that rapidly so there is something else going on.
>
Note that the existing (non-beta) v
Those spikes/decays in the temperature plot are due to false readings the Tbolt
firmware gets from the temperature sensor chip. They are an artifact of how
the temperature sensor works in its "high resolution" mode. They are actually
single sample spikes of 1C (I think) in the output of the s
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