I and others have written divider routines in assembler for the ATtiny25
etc. The version I have is crude but divides by 10, 100, and 1000. I
also have a version that divides by 1E4, 1E5, and 1E6. I also have a
version that generates 3 pps outputs, one with a 50% duty cycle plus
positive
This is an paper that may be of some interest to those interested in
clock distribution. The author, Jinyuan Wu has done considerable work
on FPGA TIC's with Fermi Lab.
http://www-ppd.fnal.gov/EEDOffice-w/Projects/ckm/comadc/TrapezCLK1b.pdf
bob darby
wrote:
On Sat, Nov 22, 2014 at 5:37 AM, Robert Darby bobda...@triad.rr.com wrote:
I finally got the time tagging fpga I was playing with to a semi-usable
state. I mentioned in an earlier post that I was unable to compile or link
the FTDI library but Magnus Karlsson very kindly rewrote a program
, Anders Wallin wrote:
On Sat, Nov 22, 2014 at 5:37 AM, Robert Darby bobda...@triad.rr.com wrote:
I finally got the time tagging fpga I was playing with to a semi-usable
state. I mentioned in an earlier post that I was unable to compile or link
the FTDI library but Magnus Karlsson very kindly
I finally got the time tagging fpga I was playing with to a semi-usable
state. I mentioned in an earlier post that I was unable to compile or
link the FTDI library but Magnus Karlsson very kindly rewrote a program
of his to provide me with a utility to set up the USB asynchronous
parallel
Perrier,
I would appreciate receiving a copy of Ivan's mods.
Thanks,
Bob Darby
On 11/4/2014 7:35 PM, Perry Sandeen via time-nuts wrote:
List,
I have just finished digitizing and repaginating *Modifying Lucent
RFG-M-RB Rubidium Frequency Standard* by Ivan Makarov. (m...@makarov.ca
Also of interest is the three pin connector behind the osc labeled Vref,
Rtn, and EFC. Present on both boards. Manufacturing test input?
bob darby
On 10/23/2014 1:19 PM, Bob Stewart wrote:
My units came in today. What I got appears to be new-in-box. It's probably
the only thing I'll ever
://www.febo.com/pipermail/time-nuts/2008-December/034955.html
Later comment on using a shift register to
minimise metastability issues:
https://www.febo.com/pipermail/time-nuts/2011-August/058648.html
Bruce
On Sunday, October 12, 2014 12:14:27 AM Robert Darby wrote:
Bob Camp,
Bob, Simon is talking about
)
If the plots don't come through as attached, they are also on google
drive here:
https://drive.google.com/open?id=0BzvFGRfj4aFkSEdYV3lXcmZIVTAauthuser=0
Cheers
Simon
On 10/10/2014 02:01, Robert Darby wrote:
Simon,
I breadboaded a set-up in March using 74AC74's and two 10 MHz Micro
Crystal
Yeah, breaks my heart but I'm not real good (try real bad) at
troubleshooting electronics (so why am i here?).
As I noted in my earlier post, the issue lies in my construction and
lack of knowledge re electronic fundamentals. I have the greatest
respect for Mr. Riley and I do not want my
, at 9:10 AM, Robert Darby bobda...@triad.rr.com wrote:
Simon,
Welcome to the tangential world.
I'm sure the clean edge I saw was an aberration, perhaps analogous
to phase locking in oscillators; I don't think it's desirable
because common sense tells you that with imperfect clocks and small
not be counted on.
The thing you *want* to come up with is essentially a random signal (ADEV), so
massive filtering will not do the trick either.
Bob
On Oct 11, 2014, at 3:33 PM, Robert Darby bobda...@triad.rr.com wrote:
___
time-nuts mailing list -- time
Simon,
I breadboaded a set-up in March using 74AC74's and two 10 MHz Micro
Crystal oscillators (5V square wave), one as the coherent source and one
as the 10Hz offset clock. I had no glitch filtering as described in the
article you cite (CERN's White Rabbit Project, sub nanosecond timing
I compared an Austron 1250A to an FTS 1050A, both 5 MHz quartz frequency
standards. I beat both against a 5Hz offset using a Riley DMTD device to
provide a 1e6 time resolution increase. There was about a 1.15e-10
frequency difference between the two oscillators (two weeks on, it's
about
This article might be of interest to those building 16 bit PWM DAC's
http://m.eet.com/media/1134628/15421-93004di.pdf
Mr. Woodward deals with the monotonicity issue quite thoroughly.
On 4/10/2014 9:42 AM, Jim Harman wrote:
I have not tried the dual PWM-based DAC, but my concern is that
In August 2011 there was a brief mention on Time-Nuts of DDMTD's which
led me to The P. Moreira and I. Darwazeh paper Digital femtosecond
time difference circuit for CERN’s timing system. I'm hoping that
someone can explain one item mentioned in this paper for me. For those
not familiar
are slower (or faster depending on the
structure) than ones with more 0’s.
There apparently is some strong data somewhere suggesting that this is all true.
Bob
On Feb 22, 2014, at 12:30 PM, Robert Darby bobda...@triad.rr.com wrote:
In August 2011 there was a brief mention on Time-Nuts of DDMTD's
Tom,
Very enjoyable talk. One small non time related quibble. Ray and
Charles Eames were not brothers; Ray was Charles Eames (Eames Chair etc)
wife and a co-collaborator on many projects. PBS has a documentary of
their work and life together.
=1s.
-- john, KE5FX
Miles Design LLC
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Robert Darby
Sent: Wednesday, October 09, 2013 12:30 PM
To: time-nuts@febo.com
Subject: [time-nuts] Question concerning ADEV measurements
Is there a methodological difficulty using the reference clock to also
clock a TIC?
Specifically, I have a 5370B with the DUT on the start input and a 5065A
on both the stop input and the external clock input.
Thanks,
Bob Darby
___
time-nuts
This is a dumb question but why not let the PRS-10 set itself using the
1PPS input and an appropriate time constant?
Thanks,
Bob Darby
On 9/2/2013 12:09 PM, Bob Camp wrote:
Hi
Ok, you are fine with the 10 MHz reading on the 5335 to get things sort of
close. Once you get past about
Is anyone aware of a schematic for the oscillator on the web? I have
downloaded the usual 10811 manuals but I've never seen a schematic or
description of the pin-outs for the double-oven version.
Bob Darby
On 7/12/2013 11:38 AM, Azelio Boriani wrote:
Is it enough if I have a schematic to
John,
After a night's sleep and a rereading of your post I finally realized
what I was doing wrong. I did not understand the the role of the
sampling interval setting and the display rate setting on the 5370.
When I follow the process below the results are totally consistent.
Sorry to
to solve the battery charging circuit issues in the FTS
1050A?
Thanks,
Bob Darby
On 7/8/2013 2:26 PM, Volker Esper wrote:
Bob,
Sorry, I'm not sure, if I've understood the issue - what exactly did
you wrong?
Thank you
Volker
Am 08.07.2013 14:48, schrieb Robert Darby:
John,
After
This is a question that has probably been addressed on the list and in
various texts but I've been unable to find an answer that I can fathom
so here's a request for some info about the behavior of TimeLab (and
probably all other similar programs).
I have been trying to find the source of
Thanks to all who responded. I didn't phrase my question very well I'm
afraid. The periodic noise/beat note issue is what lead me to try a
different sample interval. Previously I had always let TimeLab set the
sample interval (about .07s for the5370B).
I was surprised by the difference in
mode.
BTW, thanks for the program.
Bob Darby
On 7/7/2013 8:57 PM, John Miles wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Robert Darby
Sent: Sunday, July 07, 2013 3:33 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts
Thanks Götz, I'll run down those suggestions.
bob
On 5/28/2013 12:46 PM, Götz Romahn wrote:
hi Bob,
I had the same problems which I solved (partly) the following way:
transformer tc1-1t is offered here: http://www.minikits.com.au/TC1-1T
for mixers I took TUF-1 which is rather similar to
Some time back I purchased from Stanley Reynolds the necessary boards
for the Riley DMTD. I'm now looking at what's necessary to build out
these boards and the Mini Circuits parts are far and away the most
expensive parts, due principally to the 10 part minimum on several of
the items.
I'm
I have a question for the list that I'm sure Corby can address but
perhaps someone else can explain as well.
Corby notes that this mod has only been effective with late series A3
modules. My question is: what change did HP make to the A3 module
(early to late) that affects the mod Corby is
standing out
http://www.kennethkuhn.com/hpmuseum/scans/
Anyone has a later manual version? I would much appreciate to get the
late A3 version pages.
I have to say that Corby's modification in its simplicity and achieved
improvement is absolutely ingenious.
Adrian
Robert Darby schrieb:
I have
Corby,
Thanks. Hit send just as your post came in. :o(
I'm sure it will be interesting to see those changes.
Bob
On 5/1/2013 11:59 AM, cdel...@juno.com wrote:
Bob,
The new style A3 uses the same input and slighly modified output stages
from the original.
The multiplication from 5 to 60 Mhz
Does anyone have any experience using the spectracom PicoTime test set?
Just curious.
Datasheet:
http://www.spectracomcorp.com/Desktopmodules/Bring2Mind/DMX/Download.aspx?EntryId=379PortalId=0
Using with a CNT-91:
I purchased an FTS 1050 recently and after a cursory inspection of the
interior powered it up to see if it's functional.
This particular unit is a bit odd; it has the optional battery back-up,
no PPS, and instead of the usual 1Mhz, 5Mhz, 10Mhz it has four 10Mhz
outputs with tnc female
A little follow-up.
I looked at all four 1000B outputs with the scope; one pair is at 1.2V
rms and the second is at .7V rms. The waveform looks clean and is close
to the 1.0V and .5V described on the spec sheet so I conclude that the
oscillator is fine.
I disassembled the doubler case to
Dick,
If you're asking about the FTS 1050A it was on Ebay. I believe
Symmetricom still sells them but I can't justify buying one from them.
bob
On 4/3/2013 10:56 PM, Richard Solomon wrote:
Just curious, where are you getting these from ?
Tnx, Dick, W1KSZ
On 4/3/2013 7:21 PM, Robert
Gentlemen,
I've been a lurker on this list since early in 2012. I do not possess a
technical background but do have some interest in time measurement topics.
I was reading some of W. J. Riley's papers and saw that after the long
and contentious discussion on this list Mr Riley built and
Alberto,
I have been reading the time-nuts archives and ran across a Feb 25, 2006
post where you mention you coded a GPSDO for an Atmel AT90s8535. Is
that code still available and could I please get a copy of it. Also, if
you have a schematic I would like to see same if possible.
Thanks,
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