Fellow time-nuts,
my humble HP10811 + Shera controller combo signaled loss of lock since
about a week after 5 years of non-stop operation. Frequency measurement
showed it to be ca. 90 Hz low and the added oscillator enclosure (8mm
aluminum case) barely exceeded room temperature. Measurement
excellent repair and pictures
On Fri, Oct 21, 2011 at 5:47 AM, Achim Vollhardt avoll...@physik.uzh.chwrote:
Fellow time-nuts,
my humble HP10811 + Shera controller combo signaled loss of lock since
about a week after 5 years of non-stop operation. Frequency measurement
showed it to be ca. 90
Achim,
Thanks for the great pictures. I have added them to my collection.
Several years ago, I had a similar issue with a 10811 (though I can't
remember the variant, looked like yours though) that, indeed was F1, the
thermal fuse. It is designed to open at something like 105 degrees C, IIRC,
I had a 10811 with an open thermal fuse. I think that I
just replaced it with a 105 degrees C thermal fuse
from Radio Shack since the price after shipping
was about the same.
Jim Cotton
n8qoh
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I also ordered some 'replacement' fuses from Allied or Mouser or the like (I
can't recall) that were close to the specified temp but not exact. Much
cheaper, IIRC, about $4 each vs. $1.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf
$1.79 + tax and I have the fuse today, looks like their closest match
stocked in stores is 128 degrees C
Jim Cotton
n8qoh
On 10/21/11 9:54 AM, J. L. Trantham wrote:
I also ordered some 'replacement' fuses from Allied or Mouser or the like (I
can't recall) that were close to the specified
On 10/21/2011 2:47 AM, Achim Vollhardt wrote:
I had a 24V, 1.5A polyfuse at hand which was soldered in parallel to
the existing fuse. 1.5A seems a bit large,
Achim, you have replaced a thermal fuse with a current fuse. You could
have just used a piece of plain wire. Indeed in past
Achim Vollhardt wrote::
Fellow time-nuts,
my humble HP10811 + Shera controller combo signaled loss of lock since
about a week after 5 years of non-stop operation. Frequency
measurement showed it to be ca. 90 Hz low and the added oscillator
enclosure (8mm aluminum case) barely exceeded room
I've now written a small plotting program to show the PDOP, satellite
signal strength, inactive/coarse/fine lock mode etc. This ideally needs
to run for several days with the box connected to each puck in turn, but
preliminary results show that the unit achieved fine lock several
times with
24 hours should in theory be enough but 2 is not a statistically valid
sample size. you need more samples before you can say anything about
the probability of locking. How many depends on the size of the error
bars you can live with.
On Fri, Oct 21, 2011 at 8:54 AM, David J Taylor
Has anyone done it? If so, how does it compare with the 10811 or other
OCXO's in this configuration?
Also, has anyone compared a Shera Controller controlled OCXO to a TBolt or
other commercial unit? If so, what did you find.
Thanks in advance.
Joe
If this polyfuse being discussed is what I know as a positive
tempco thermistor (PTC) current limiter, it could be either
detrimental or ideal for the application - it all depends on the
resistance vs. temperature characteristic. PTCs for protection are
commonly used as resettable fuses, but
Hi Attila,
please share the document with us.
Thanks,
Said
In a message dated 10/20/2011 22:28:19 Pacific Daylight Time,
att...@kinali.ch writes:
That's also my impression. It was only after i had a longer
discussion with one of the user support guys about the exact
specs of the 6T
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of saidj...@aol.com
Sent: Friday, October 21, 2011 11:48 AM
To: time-nuts@febo.com; t...@leapsecond.com
Subject: Re: [time-nuts] Russian GPSDO
Hi Attila,
please share the document with
Bruce, the most common cause of a GPS receiver getting the date incorrect is
due to cross-correlation. And cross-correlation is usually the result of
too much gain in the GPS antenna's LNA. And depending on the make of the
receiver, some will clear the date information with a power cycling
On 21 Oct, 2011, at 11:53 , k4...@aol.com wrote:
Bruce, the most common cause of a GPS receiver getting the date incorrect is
due to cross-correlation. And cross-correlation is usually the result of too
much gain in the GPS antenna's LNA. And depending on the make of the
receiver, some
It would be easy to modify my GPSMonitor project to drive a pin with an alarm
signal if the GPS has lost lock. What you do with that signal is up to you.
See the project page at http://www.ko4bb.com/Timing/GPSMonitor/
Didier KO4BB
Sent from my Verizon Wireless BlackBerry
-Original
Hello,
I use TimeLab and the HP5370B and a Prologix GPIB interface.
After making several 10 Hr runs with the same oscillator I noticed
something
When laying the successive runs on top of each other there are little
blips
and bumps that line up perfectly on top of each other.
For example
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