Miy FA2 came in today. A very quick test shows that it works. It does not
appear to have the -0.0002 Hz freq measurement bias that the FA1 has.
The 0.1 second gate time mode is pretty useless... there appears to be a 300
msec dead time between measurements in 0.1 (and 10 sec) gate time
Hi
The gotcha is that (unless you have something very exotic) there *is* no one
standard
for the lab. You may have a device that is quite good on phase noise at some
offsets and
horrible for long term. You might have another device that is good medium term
and also
pretty good for close in
I think chrony is better suitable to who wants more customization options,
such as faster pooling times, better delay calibrations and advanced
filtering settings (i dont know all on Openntpd nor chrony) but with my
experience with chrony i can say that chrony is good for my usages.
Em qui, 26 de
Hi
If the OCXO only makes it 6x10^-10 past 10 MHz, that’s not enough for the unit
to lock properly. 40 Hz tune range looks fine so not a shorted tune line. New
best
guess would still be an OCXO problem. Swap it out and see what happens. The
OCXO’s show up on eBay all the time. Who knows what
Hi
If your OCXO tunes to 10 MHz at -3.5V and it used to tune at +0.5V, it sounds
like the tune line is shorted somewhere.
That could be inside the OCXO or outside. If the short is “noisy” (and that is
not unusual) you aren’t going to get it to lock.
You need to figure out where the short is.
On Thu, Sep 26, 2019 at 6:08 PM djl wrote:
>
>
> Any quick opinions re use of chrony vs other NTP implementations?
> THANKS
> Don
It really depends on the use case. chrony seems to pick a "best"
source and try really really hard to track that one true source. ntpd
tries to intelligently track
It looks like since last Oct the osc jumped frequency and has become less
stable.
This is not unheard of for an ocxo. It may be time to replace with a true
Trimble Thunderbolt. A couple are now on ebay for 2-300$. It is possible to
replace the ocxo, assuming nothing else is wrong with the
Any quick opinions re use of chrony vs other NTP implementations?
THANKS
Don
--
Dr. Don Latham AJ7LL
PO Box 404, Frenchtown, MT, 59834
VOX: 406-626-4304
___
time-nuts mailing list -- time-nuts@lists.febo.com
To unsubscribe, go to
Got mine today as well, Bert. Haven't gotten a chance to use it yet,
good to know you had positive results.
Don
On 2019-09-26 11:05, ew via time-nuts wrote:
Did receive FA2 counter today. Everything as promised, like the 10
second mode best.Use a Datum 2000 as source 10 MHz in the back 5 MHz
Bob, et al.
First, current line up of timing source:OCXODOCXOEfratom Rb of various
kindPRS-10GPSDO of various kindDatum FTS4040/AHP5071A high-performance (DEAD
tube)
Time measurement gear:HP85132AHP5335AHP5370ATIC
My first and at most problem is, I don't know which one to trust and in what
On 9/25/19 01:19, Martin Burnicki wrote:
Paul Theodoropoulos via time-nuts wrote:
Only tangentially related, but for keeping a Windows PC synced, I'm
rather partial to NetTime. It's a tiny tray app, quite flexible, and
otherwise unobtrusive. It's a freeware app, though donations are
Hi All,
Sorry I forgot to attach the freq vs DAC voltage table to the email that
I just sent:
DAC V Freq
+5.0 9.999.961
+0.0 9.999.985
-3.0 9.999.998
-3.5 10.000.000
-3.8 10.000.001
-4.0 10.000.002
-4.5 10.000.004
-5.0 10.000.006
So the oscillator is not
Hi Nigel, and Bob, and Bill!
Thanks for the notes! I very much appreciate your helpful comments. I
will give my responses to all of your helpful posts here. Sorry for the
delay in responses. The reason for the delay is that my Thunderbolt is
at a remote site and I can communicate with it
Did receive FA2 counter today. Everything as promised, like the 10 second mode
best.Use a Datum 2000 as source 10 MHz in the back 5 MHz in the front reliable
+- 1 on the last 12th digit.
Bert Kehren
___
time-nuts mailing list --
I have a number of revisions of the John Vig tutorial in my Manual pages.
The most recent was sent to me directly by John but I am not sure if it has
the notes.
www.ko4bb.com
Go to Manuals and search for Vig
Didier KO4BB
On Thu, Sep 26, 2019 at 7:03 AM Chris Caudle wrote:
> On Wed, September
On 9/26/19 6:15 AM, Chris Caudle wrote:
A very good place to start is searching for John Vig oscillator tutorial.
John Vig has a lengthy presentation about all things relating to
oscillators, if you can find the version which includes the notes along
with the presentation slides you can spend a
From: Adam Kumiszcza
It will be connected via a short cable (1,5 m or less) to one computer. The
second will join much later, I will worry about splitting the signal then.
Other computers would be in different rooms, so I would need another time
source.
My question was rather if stacking another
On Wed, September 25, 2019 5:45 pm, Taka Kamiya via time-nuts wrote:
> discussions take place both for GPSDO with Crystal Oscillators and
> Rubidium modules. It appears there are two types of each.
> 1) fixed frequency type (less jitter)
> 2) frequency agile type (more jitter)
That is a bit
From: Peter Laws
I've noticed the same issue (running Meinberg's build of NTP) with the
same amateur radio program where the PC is a certain number of seconds
off (4 or 6 or so or whatever but on the order of what the OP
reported). A restart of NTP "fixes" it. This happens after a cold
boot
Tom,
I know you are absolutely right. When I buy from eBay, I have no idea where
they came from. Reject pile, junk yard, or pristine clean room.
Unfortunately, I can afford up to certain amount. I have lots of PRS10 but
their origin is unknown. Even if I buy 5065A, origin will be unknown
Maybe that "GPS tamed" is literally translated from chinese for "GPS
disciplined". It is indeed the disciplining that gives personality to
the GPSDO. You can PLLize the OCXO's 10MHz or the PPS derived from the
OCXO's 10MHz and see different results on the 10MHz's stability and
accuracy. It seems
It might be a bit of an over-simplification to split oscillators in
those two camps, "fixed" and "agile". There are often many trade-offs in
performance that you have to deal with. Moreover if you are getting your
oscillators from eBay, or especially parts from China, you may also have
to
I also see terms like GPS tamed or PLL-GPS.
https://www.ebay.com/itm/1pcs-PLL-GPSDO-10M-GPS-tamed-clocks/263392170249?hash=item3d53659109:g:1p0AAOSwH3haNo7c
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR12.TRC2.A0.H0.Xgps-pll.TRS0&_nkw=gps-pll&_sacat=0
It is not at all
23 matches
Mail list logo
