Le 16/05/2011 00:29, iov...@inwind.it a écrit :
You are right, the right value for the crystal would be about 32859.27, but I
thought that such a difference could be compensated in the circuitry, that's
why I omitted the decimals.
before you get into grinding I have a question on your chosen fre
li...@rtty.us said:
> In a full sized wall clock, most of the power is to the motor. On a wrist
> watch - it depends on how well the watch is built.
Thanks.
I think that means that it's not silly to generate a PPSS (Pulse per Sidereal
Second) signal by counting to 364/365 of 32678 rather than
Hi Brent. I have yet to connect RS232 to check on the masks. Did you get any
responses RE: the effect of setting AMU to 0 on the 10 MHz output?
73 Eugene W2HX
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of brent evers
Sent: Monday, Ma
Hi Burt, thanks for the excellent information and your experiences with this
model! I have to models, the -52054 and -52117
The 52054 seems to see the SVs much more easily. The 52117 using the same
antenna and antenna location sees nothing (I haven't tried moving the
antenna to a substantially bett
I received today a LUCENT RFTGm-II-XO and RFTGm-II-RB assembly, chips with
2000 date code. I would like to change the behavior of the units, using GPS
signal to discipline the Rb unit (for long term stability) and the Rb
disciplining the XO (for low phase noise). The archives have some scattered
in
Hi
If the "arms" are to far off from each other the Q starts to drop /
resistance starts to climb.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Attila Kinali
Sent: Tuesday, May 17, 2011 12:01 PM
To: Discussion of precise time a
On Tue, 17 May 2011 11:52:53 -0400
"Bob Camp" wrote:
> And you want to keep both sides of the tuning fork equal length to roughly
> one part in 50,000 when you move it 1 part in 365.
May i ask, why this is important?
Attila Kinali
--
The trouble with you, Shev, is you
Hi
And you want to keep both sides of the tuning fork equal length to roughly
one part in 50,000 when you move it 1 part in 365.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Lux
Sent: Tuesday, May 17, 2011 11:09 AM
To: time
On 5/17/11 7:01 AM, Jean-Louis Oneto wrote:
I realized that there was lot of way to avoid this [pulldown] problem,
but as I said, it was a long time ago (around 1976...), I was young and
inexperimented, and I just tried once on an almost broken 5 FF (~$1)
wristwatch, then I decided that the softw
I realized that there was lot of way to avoid this [pulldown] problem, but
as I said, it was a long time ago (around 1976...), I was young and
inexperimented, and I just tried once on an almost broken 5 FF (~$1)
wristwatch, then I decided that the software approach would be better for
me.
I use
Hi Jean-Louis,
I'm pleased to hear that you had success trying to modify such a crystal,
though you had problems checking the frequency.
Regarding this aspect that I'm aware of, my idea is to "hear" to the 32kHz
signal with a HP3586A selective voltmeter or a R&S VLF receiver. Further, as
electr
Hence the advantage of your frequency counter's period averaging mode. Don't
measure the crystal, measure the divider it is connected to. That way loading
effects are not directly on the crystal.
Bob LaJeunesse
From: Jean-Louis Oneto
To: Discussion of precise
Hi again,
I forgot to mention this nice piece of software useful to check what you're
doing:
http://www.gb.nrao.edu/~jbrandt/jLSTclock/
Jean-Louis
- Original Message -
From: "Jean-Louis Oneto"
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, May 17, 2011 12:
Hello list,
I tried that a long time ago, but the trap I went into was that the
capacitance of the 'scope probe was pulling the frequency down, so I ended
with a crystal too high in frequency...
I'm not sure that you can control the frequency without significantly
perturbing it. And waiting to
Neville and Jim and all,
there are good pictures of tuning fork crystals at
http://en.wikipedia.org/wiki/Crystal_oscillator
I think it is the 8x3 mm in size, which is available from China (10 units for
2.5$ including worldwide shipping). Assuming as a reference the diameter of the
baseplate,
Hi
In a full sized wall clock, most of the power is to the motor. On a wrist watch
- it depends on how well the watch is built.
Bob
On May 17, 2011, at 12:37 AM, Hal Murray wrote:
>
>> As an alternative you could build an external circuit (a few uA at 3V
>> supply) and generate a signal to i
16 matches
Mail list logo
