Having followed the conversation and having looked at the p[possibility using a
FRK with laser diode, it is low on our list because of all the ongoing projects
but please if you want to spend time and money use any thing but a FE5680. I
was one of the first using it and noticed and posted a 4 Hz
Ann other Microwave Journal Paper an invited paper but by Morion Inc.
Precise Frequency Sources Meeting the 5G Holdover Time Interval Error
Requirement
Bert Kehren
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Richard McCorkle on his own GPSDO design had a separate PIC keep track of the
saw tooth information from a M12 ad and subtract during the filter time
constant and transferd the sum to the filter for processing.
Bert Kehren
In a message dated 5/21/2018 2:55:44 PM Eastern Standard Time,
ch...@
Should say 1.7 nsec we also plan to use the GCLK output for what I call a GPS
PLL we have done it successfully with low cost u-blox with E-11 frequency
results.
Bert Kehren
In a message dated 5/21/2018 7:49:20 AM Eastern Standard Time,
time-nuts@febo.com writes:
Our answer was real time
Thank you Ole
Juerg and I spend most our time on frequency,control and measuring. We also see
2 E-12 frequency using GPS and blame the Ionosphere. Which brings up the
Question does the way you use the OEMV-3 in your experiment use L1 L2
compensation and where can I buy one? Looked for hours last
contact me off list I have a couple Bert Kehren
In a message dated 5/5/2018 9:17:45 AM Eastern Standard Time,
time-nuts@febo.com writes:
I am trying to use the 60 KHz for synchronization of a Rb receiver. The local
NJ noise and the signal in dBuV are about the same with an active antenn
In the April Microwave Journal is an extensive article on a "Ultra-Low Phase
Noise Oscillators with Attosecond Jitter"and measuring techniques.
Bert Kehren
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Attached is a picture of the D/M as we use it. Corby has added things making it
difficult to see. Only thing missing is Offset OCXO.
We have worked off list with some members and have run out of boards. Juerg is
working with a German time nut on fine tuning Riley, just very minor. Boards
will be
Attached is a picture of the D/M as we use it. Corby has added things making it
difficult to see. Only thing missing is Offset OCXO.
We have worked off list with some members and have run out of boards. Juerg is
working with a German time nut on fine tuning Riley, just very minor. Boards
will be
How did you measure temperature sensitivity
Bert Kehren
In a message dated 4/6/2018 3:40:18 AM Eastern Standard Time,
hol...@hotmail.com writes:
I replaced the OCXO on one of my Thunderbolts with an Oscilloquartz 8663 and
the temperature sensitivity went down by about 2/3, so I always assum
YSI has been my choice for decades. Had to modify because the batteries are no
longer available. How ever I like to point to a GTH 175/MO very handy 0.1 C
resolution good specs have had it for many years and I Googled it still
available, bought it at Conrad but that was 15 years ago.
My partner
I respectfully disagree. The OCXO is not the temperature problem with the
Tbolt. It is the DAC. Again this is not a product developed for time nuts it
did an excellent job for its intended purpose. Over a year we worked on the
Tbolt using HP 10811, OSA 8600, FRK Rb, M100 Rb with excellent Warren
No control voltage change of an OCXO in a year is amazing. What is the OCXO
Bert Kehren
In a message dated 4/5/2018 10:52:11 AM Eastern Standard Time,
gerh...@wittreich.org writes:
Bruce,
The link Azelio Boriani shared is the source I used when doing the same
project. Please, post your res
Lat year some one from the UK asked me about a 1 inch CRT for the Tracor 527. I
did respond that I thought I had one but out in one of the 45 Aple crates in
the Garage. After 3 years from my move from Miami today I started serious
downsizing and found a Telefunken DGP-12A do not know if it will
Gary
There is a Blast from the past the PIC TIC. Richard McCorkle did it and in its
time was widely popular. He helped me on many projects so I included his boards
with my board orders. Not being a time nut I never took a closer look at his
board. Having recently revisited the subject for simple
Question
Using L/H what is too much signal
Bert Kehren
In a message dated 4/1/2018 10:54:23 PM Eastern Standard Time,
david.partri...@perdrix.co.uk writes:
just use a bias tee to feed in the antenna volts :)
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On
I think Bob is right and knows what he is talking about. Example Furuno GT-87,
how many years have I known about it and tried to buy some, just recently
became available.
Bert Kehren
In a message dated 4/1/2018 10:52:50 PM Eastern Standard Time, jg...@zianet.com
writes:
Bob,
If it was a
In the PRS 10 The OCXO is controlled by a DAC not directly by the optical
package. With Corby's work on the Super where he also used in one case a good
and an other case not so good 10811 it is the S/N at the detector output in a
0.05 sec loop that makes the difference. Results where the same.
Richard
is that the BCDl DDS sounds familiar, if so there are Cs out there that
need them and can not be found.
Bert
In a message dated 3/20/2018 2:08:39 PM Eastern Standard Time,
w1...@outlook.com writes:
In rooting through my stash, I found a couple of these boards that I picked up
s
Allow me to make some follow on comments on John’s post. Much of the equipment
we use was never intended for what we use it for and developed at a time that
certain parameters where not tested, and equipment now available for our
efforts is getting rare.
We are working on 1 E-13 frequency at one
Thank you Tom, for the record the pictures where taken by Juerg Koegel my
partner in crime
Bert Kehren
In a message dated 2/26/2018 11:05:19 PM Eastern Standard Time,
t...@leapsecond.com writes:
Bert's M100 Rb teardown photos are now here:
http://leapsecond.com/bert/m100.htm
/tvb
-
attached a picture of the open FRK
Bert Kehren___
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FRK is possible candidate we are looking at it add filter, reduce time constant
Corby did but forgot to reduce filter time constant. 5065A is 0.05 seconds.
We have to many projects low on the list Juerg is right now doing the new A9
for Corby
If any body wants to seriously get involved contact
/2018 8:55:22 AM Eastern Standard Time, att...@kinali.ch
writes:
On Thu, 22 Feb 2018 07:00:54 -0500
ew via time-nuts wrote:
> Now a step by step work over, including HP mods for later units like
> replacing the 74196’s in the synthesizer module with 74LS196. May have been
> end of li
In December I lucked out buying a HP5065A for a very reasonable price, as is
not tested. Turns out it was not working and I was not able to fix it. Corby to
the rescue. Corby and I have shared many projects over the past, go back over
15 years, as a matter of fact he introduced me to time-nuts.
Talking about Furuno has any one looked at the GT-87. I have known about it for
years but found no way to buy some now DigiKey has them for $ 100, Buerklin in
Germany for half that price. Saw tooth is +- 1.7 nsec we are not going to
bother with correction. We are in the process to lay out a boar
Paride
The LEA-5T differs from other devices only that it has saw tooth information
that can be used for correction or in a loop' I did a board and have one with
variable delay using the 5T. Looking at the picture I do not even see an output
for that information. Any later standard $10 module wi
In my opinion the SI 5328 is worth looking at for time nut application, like
offset frequency. My problem is solder ability. Does any one know a source for
an evaluation board or as an alternative a source that would do a small volume
assembly?
Bert Kehren
__
Has any one done a 24 hour plot of the Tbolt 1pps.
Bert Kehren Palm City F.
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Thank you Tom.
Very informative, sadly no simple answer to overcome the shortcoming. After
move, downsizing and age I imposed on my self a buy stop that I keep braking. I
did buy this year two 53132A's mainly because of the RS232 interface. Before I
had excellent results with a combination Trac
Rick
Please contact me off list we did a board for Corby to be used with the HP Rb
using a PIC but I would have to better understand your needs to figure out what
board to use.
Bert Kehren
In a message dated 12/13/2017 4:06:01 PM Eastern Standard Time,
artgod...@gmail.com writes:
It's a bi
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