John Ackermann N8UR wrote:
Dr. David Kirkby wrote:
Can anyone tell me anything about the differences between the manuals
for the above. Does the service manual include all the user
information, and therefore make it a waste of money to buy both?
I have on order a HP 5370B and are tring to determ
My understanding from talking to the experts is
that no aging, or environmental effects are observable
on the 5071A, and measurements have been made into
the 10^-15 range. Also, no systematic frequency offset
has been observed down to at least 1x10^-14. IE,
frequency offset between different 5071
Hi Rick:
I agree.
It's just that my FTS4060 IS drifting.
The Excel equation and fit for a month of data as of this morning are:
y = -1.2954x2 + 243.1x - 10631
R2 = 0.9607
Where y is in ns, x is the Day of Year and R2 is the quality of the fit
(very good).
The first derivative (after dividing by
Correction:
The first derivative should be:
Offset = -3E-14 * X + 2.8E-12
so the offset for today 20 April (day # 110) is:
Offset = -3E-14* 110 + 2.8E-12 = -5E-13.
Brooke
Brooke Clarke wrote:
Hi Rick:
I agree.
It's just that my FTS4060 IS drifting.
The Excel equation and fit for a month of data as
I just aquired my first Austron 2100F loran frequency monitor via ebay.
I'm having trouble reading the display. There is leakage to other
segments of the display that should normaly be off.
To be most specific when I enter from the key pad the other blank
digits start activating slightly whe
Hi George:
A common problem with the 2100 series units is that the LCD gets loose
in it's socket.
Unplug the two front panel ribbon cables, remove 6 screws.
Have a close look to see how the LCD is relative to the socket, then
carefully remove and reinstall the LCD.
Let us know if that fixes it.
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Brooke Clarke
Sent: Wednesday, April 20, 2005 11:33 AM
To: Discussion of precise time and frequency measurement;
[EMAIL PROTEC
Hi George,
There are two problems with the 2100 families front panel. The LCD,
and the keybuttons. The keybuttons were not properly debounced for the
long haul. As the switches get older, the bounce time increases and the
keypad logic starts to generate multiple switch entries for each press.
Th
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
I don't think so, that appears as greater and greater phase noise.
I think Brooke is watching his control loop fail. Cs doesn't drift,
that is why it is a primary standard.
-Chuck
-Original M
In message <[EMAIL PROTECTED]>, "Richard \(Ric
k\) Karlquist \(N6RK\)" writes:
>My understanding from talking to the experts is
>that no aging, or environmental effects are observable
>on the 5071A, and measurements have been made into
>the 10^-15 range. Also, no systematic frequency offset
>has b
Hi Bill:
I wish it was something that simple, but this is a brand new unit.
Have Fun,
Brooke
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Brooke Clarke
Sen
Hi Chuck:
Is there something I can to do check for control loop failure?
Brooke
Chuck Harris wrote:
Bill Hawkins wrote:
How about this:
Brooke is watching the last of his cesium evaporate.
Bill Hawkins
I don't think so, that appears as greater and greater phase noise.
I think Brooke is watching hi
I hate to reply to myself, but there is another failure that will cause
the LCD display to go nutty, if the +5V logic supply is not regulating
properly, and is up around 5.5V, the display will do just what you are
saying.
-Chuck
Chuck Harris wrote:
Hi George,
There are two problems with the 2100 fa
In message <[EMAIL PROTECTED]>, "Dr. David Kirkby" writes:
>ManualsPlus have got back, and said they have the manuals, but there are
>no change sheets that cover up to the serial number of the unit I have
>(2904A02491). I will buy the manual from them, although I've asked them
>to clarify if I
Just another idea
Might be the Cs tube is just going to stabilize its magnetic field. Is there
any possibility to degauss the tube, like with the 5061 high performance
tube? This could be a very small drift/day.
Hubert
DB7ME
-Ursprüngliche Nachricht-
Von: [EMAIL PROTECTED] [mailto:[EMAIL
Hi Hubert:
I don't have a degaussing device. Are the plans to make one available?
Thanks for the idea,
Brooke Clarke, N6GCE
--
w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml
http://www.precisionclock.com
Hubert v. Bonhorst wrote:
Just another idea
Might be
Hi Brooke,
There should be some evidence that the center of the beam
current is slipping off of its peak value if it is a control
loop failure.
Perhaps you can open the loop, and use the control voltage pot
to peak the beam current and check the frequency at that point?
-Chuck
Brooke Clarke wrote:
Brooke Clarke wrote:
Hi Hubert:
I don't have a degaussing device. Are the plans to make one available?
Thanks for the idea,
Brooke Clarke, N6GCE
The 4050 has the degaussing coil built in. I would think that the 4060
would too. All you have to do is connect a variac to the degaussing terminals,
a
On Wed, 20 Apr 2005, Poul-Henning Kamp wrote:
> In message <[EMAIL PROTECTED]>, "Dr. David Kirkby" writes:
>
> >ManualsPlus have got back, and said they have the manuals, but there are
> >no change sheets that cover up to the serial number of the unit I have
> >(2904A02491). I will buy the manual
Hi Chuck:
I have one of the many FTS4060/S24 units being sold on
http://www.governmentliquidation.com. As far as I can tell these are
stripped of every possible thing that could reduce the price and so I'm
sure there's no built in degaussing capability.
But I'm willing to wait out the problem
Hi Brooke,
Well, the degausing can even be done using the coil that is used to set
the offset. So, I wouldn't be so sure that you don't have a degaussing
coil built in.
-Chuck
Brooke Clarke wrote:
Hi Chuck:
I have one of the many FTS4060/S24 units being sold on
http://www.governmentliquidation.co
Hi Chuck:
OK. I can set the 3 thumb wheel switches to 999, wait some, then to 000
wait some, then to 900 , 100, etc. etc.
How many steps is reasonable and how long to wait?
Thanks for that idea.
Brooke
Chuck Harris wrote:
Hi Brooke,
Well, the degausing can even be done using the coil that is use
Chuck,
I have two 4060's, one like Brooke's and one regular production. Neither
have degaussing connections inside or out and none of my 4060 manuals
mention degaussing. My HP 5061's certainly have degaussing provisions.
Take care,
Had, K7MLR
At 06:11 PM 4/20/2005, you wrote:
Hi Brooke,
Well, th
No, that isn't quite it! You disconnect the offset magnetic
coil, and connect it to a variac with a series light bulb to limit
the current. I cannot tell you what size bulb to use, or how much voltage,
as I would have to make some educated guesses. Make the wrong guess,
and B/O is possible.
I re
Hi Chuck:
If I had a schematic I'd give it a go, but without it, I'm not
comfortable powering random wires.
So it's back to waiting.
Have Fun,
Brooke
Chuck Harris wrote:
No, that isn't quite it! You disconnect the offset magnetic
coil, and connect it to a variac with a series light bulb to limit
At the risk of misleading Brooke down the wrong path
For what it's worth, my copy of the HP-5060 manual talks about
using the LF coil to test for a possibly magnetized cesium tube.
The injected audio test signal is swept from 50Hz to 5kHz. Any
sharp peaking in beam current above 2500Hz indicat
I picked up a HP 10811A today and need the connection information.
I tried the WEB and went to the "Bama" site but at Bama they removed all
HP info.
Thanks
Bill K7NOM
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I imagine that that is because HP just went on the warpath, and declared
all copies of their manuals verboten. I just got several notices from
ebay telling me about how some HP manuals on CDs that I bought were
infringements
on HP's intellectual property. This was old stuff too, from the early '
Bill,
I'm not sure where the diagram went on my
site so use the one halfway down this page:
http://home.teleport.com/~oldaker/10mhz_construction.htm
/tvb
http://www.LeapSecond.com
- Original Message -
From: "Bill Janssen" <[EMAIL PROTECTED]>
To:
Sent: Wednesday, April 20, 2005 19:02
S
Hi Chuck:
A true story:
As part of my job at HP/Agilent I was on the road quite a bit living in
hotels. My laptop was able to connect into their network most of the
time in a secure manner. But every now and then it refused to connect.
So there was an 800 support number to call and those folk
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