Did it occur to anyone that possibly these units where intended to be used in
some very cold country, like the top of Alaska or some similar place wheere a
little additional help was necessary ? ? ?
Just a thought . . .
BillWB6BNQ
Ed Palmer wrote:
> > Date: Sat, 19 Jul 2008 20:35:38 -0700
> Date: Sat, 19 Jul 2008 20:35:38 -0700 (PDT)
> From: "Rick Karlquist" <[EMAIL PROTECTED]>
> Subject: Re: [time-nuts] Double ovened 10811-60158 on ebay
> To: "Discussion of precise time and frequency measurement"
>
> Message-ID:
> <[EMAIL PROTECTED]>
> Content-Type: text/plain;charset
> Date: Sat, 19 Jul 2008 20:40:24 -0700 (PDT)
> From: "Rick Karlquist" <[EMAIL PROTECTED]>
> Subject: Re: [time-nuts] Double ovened 10811-60158 on ebay
> To: "Discussion of precise time and frequency measurement"
>
> Message-ID:
> <[EMAIL PROTECTED]>
> Content-Type: text/plain;charset
Hi,
surely an oven that controls to 1*C limits the inner xtal oven from
the outside 0 - 50*C,
so with a finite gain on the inner oven the oven the XTAL is
controlled 50 times as well?
Thats why they use double ovens.
cheers, Neville Michie
On 20/07/2008, at 1:40 PM, Rick Karlquist wrote:
>
Ed Palmer wrote:
> Bill,
>
> I picked up a couple of these 'naked' oscillators. I was surprised to
> hear that you stripped yours down. I'm planning to build it back up to
> its former glory with a controller for the outer oven and a new cover of
> some sort. Is there any reason not to do that?
Mike S wrote:
> At 05:33 PM 7/19/2008, wje wrote...
>> Another thing, the 10811B in mine doesn't have a removable endplate,
>>it's soldered. This makes it a lot more difficult to adjust or
>> repair.
>>Still, I think it's a fine buy for the cost.
>
> Well, yea. Maybe Rick Karlquist will pi
8.1E-14... egad, that's almost 1e-13. We're time nuts... we demand
perfection from our imperfect instruments... or at least the illusion/delusion
of perfection.
My FTS-4060M seems to be drifting from GPS by a fairly consistent 20 ns per day
(2.3E-13) (not too shabby for a $600 woogedy ol
No problem on PayPal. I just put it where mine was and it started a self
survey by itself. I don't have any fancy test equipment but I'll let it drive
my
10 Ghz rig and listen to some beacons and see if I can tell any diference.
Where are you at?
Chris
> I would be interested if you accept pa
> I noticed that all the Zeeman freqs seem to be specified
> to 10 Hz resolution. Were the systems designed with the
> c-field set to make this happen or are more precise values
> available? It seems that such an important value would be
> specifed with greater precision. I have my FEI-5650A
> p
Two reasons - I don't have the outer can, and I don't have the
controller for the outer oven. The controller was on the Z3801 power
supply board (which is what I think these came out of, or something
very similar). I really just wanted a good tcxo with an efc input,
which the bare os
Bill,
I picked up a couple of these 'naked' oscillators. I was surprised to
hear that you stripped yours down. I'm planning to build it back up to
its former glory with a controller for the outer oven and a new cover of
some sort. Is there any reason not to do that?
Thanks,
Ed
> Date: Sat,
Bill,
2095 is indeed for 12.6317716 Mhz and a Zeeman of 42.82Khz.
If you can't get splitting at 42.82 then change the synthesizer to
12.6317725Mhz and try again using 53.53Khz.
If no splitting at 53.53 within the C-field dial range you will need to
select a new resistor/s on the A15 board.
Set
I noticed that all the Zeeman freqs seem to be specified to 10 Hz resolution.
Were the systems designed with the c-field set to make this happen or are more
precise values available? It seems that such an important value would be
specifed with greater precision. I have my FEI-5650A program s
Predrag Dukic wrote:
> Bill,
>
> I am not a quantum physicist, but my understanding of Zeeman
> splitting is a bit different.
>
> With applied homogenous DC magnetic field to the atoms on their path
> You get splitting. Without it You have no Ramsey fringes.
Correct,
> There is a formula t
They probably spent most of their life outside. The air pollution
over there is horrible !!
73, Dick, W1KSZ
-Original Message-
>From: wje <[EMAIL PROTECTED]>
>Sent: Jul 19, 2008 2:33 PM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] Double ovened 1081
At 05:33 PM 7/19/2008, wje wrote...
> Another thing, the 10811B in mine doesn't have a removable endplate,
>it's soldered. This makes it a lot more difficult to adjust or
> repair.
>Still, I think it's a fine buy for the cost.
Well, yea. Maybe Rick Karlquist will pipe in, but I believe t
I got one without the outer cover, which isn't quite as useful. I
removed all the junk to get down to the orginal non-double-ovened osc.
One thing I noticed - I wonder where these were actually deployed? The
10811B itself has a fair amount of corrosion on it, lots of pitting. It
stil
>I see that the same vendor has a few more units for sale. He has also
>included a picture that labels all the connections.
At least they look to be complete with their outer covers now, which
would be useful if anyone did want to add some temp control.
Seeing all those oscillators does make
Thanks all. I reviewed some physics on this, and now it makes sense.
Corby, my 5061A is an oldie, it has the early synthesizer that has the
UTC offset correction, which I've set to match atomic time (L2095 on the
switches).
The tube was replaced in '82. So, I need to verify that the C-field
cur
The Zeeman frequency is calculated by the amount of C-field current you
use.
If you change the Zeeman then to get the unit "on frequency" you then
have to change the synthesizer frequency and the C-field current to
compensate. The amount of C-field change is too big for the front panel
knobpot so
I would be interested if you accept paypal,,would offer 200.00 if new cond..
[EMAIL PROTECTED]
-- Original Message: -
From:[EMAIL PROTECTED]
To: time-nuts@febo.com
Subject: [time-nuts] Trimble GPSDO unit for sale
Date:Sat, 19 Jul 2008 01:43:
Bill,
I am not a quantum physicist, but my understanding of Zeeman
splitting is a bit different.
With applied homogenous DC magnetic field to the atoms on their path
You get splitting. Without it You have no Ramsey fringes.
There is a formula to calculate mid-fringe offset from defined ces
> My understanding is that the precise cesium hyperfine transition energy,
> and hence microwave frequency, is dependent upon the applied C-field,
> and the field setting to select a particular transition is the same for
> all clocks (which is why these are primary standards). The C-field is
>
My understanding is that the precise cesium hyperfine transition energy,
and hence microwave frequency, is dependent upon the applied C-field,
and the field setting to select a particular transition is the same for
all clocks (which is why these are primary standards). The C-field is
set by app
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