Newer version works great. Just reflash. It'd be nice if it was as easy
as apt get update or yum update but flashing new image works.
Bill
On Fri, Dec 31, 2021, 6:17 PM John Miller via time-nuts <
time-nuts@lists.febo.com> wrote:
> Hi Robert!
> You almost certainly are still running the
There's no substitute for a few good rubidiums. OCXO and Rb are
different. It's really hard to beat a really good GNSS diciplined Rb!
Extremely good holdover. We're timenuts after all right? Where's the fun
if you don't try them all? There isn't any silver bullet or perfect
solution but I've
So many layers in there Corby! It's amazing how these things are built!
Really cool series to read about. Thanks for the update! I really hope
you get this thing going.
Best Regards,
Bill
On Wed, Oct 20, 2021, 11:15 AM wrote:
>
> Subject: Passive Maser teardown
>
> Just added "update 5" to
White rabbit seems pretty good for time synced over fiber. PTP with
enhanced stability profile. It's a IEEE standard. It seems to work for
CERN. Lately I've been looking at Cisco devices that can support it. It
whould be nice if I could find hardware that'll support it more easily...
Maybe
I'd be interested in 2 too.
Bill
On Wed, Apr 28, 2021, 4:10 AM Michael Gindonis
wrote:
> I would be interested in at least one, perhaps even 2. and perhaps bare
> boards.
>
> Some things that if not already considered, could make it more interesting
> than it already is:
>
> - possibility to
Let me know when I can buy one please! I'm not kidding. ;^}
Bill in Arizona
On Sat, Feb 6, 2021, 1:25 PM Tom Van Baak wrote:
> > ptti/1981papers/Vol%2013_30.pdf
>
> Note the dialog on the last page. Dave Wineland went on to win the 2012
> Nobel prize in Physics:
>
>
>
Knock offs is part of the reason I posted the main US distributer earlier.
The software is basically open source so anyone could theoretically make
one. There's only one original manufacturer though. R Electronics is
the only sanctioned US distributer I'm aware of. Also they have the best
price
I concur! Thanks Tom. You guys have really helped me a lot along with all
the archives and everyone on TN! Here's to an even better 2021. Maybe
more better gear will show up on used market this year! I look forward to
all the posts here! It seems a special kind of people appreciates time for
@dana I bought one of the TinySA from the usa distributer. It even comes
with an sma antenna that screws right on. I'm actually pretty amazed with
how this little thing works! You can see the radio stations around easily
along with other things if they're leaking. Really amazing little piece
I ordered some too for reduced offer price. BTW the seller is a she not a
he in case you're interested. QUEEN*S_LAND is definitely a girl. I've
seen her picture before. I'm interested in what you all come up with using
these. I've bought a lot of stuff from her and she ships quickly.
Bill
That's a really old board though. An 8 series isn't pin compatible with
say LEA-6T is it? The picture had a 5 series in it.
Could you use something like this?
https://github.com/PaulZC/NEO-M8T_GNSS_FeatherWing/blob/master/LEARN.md
Bill
On Tue, Dec 8, 2020, 10:30 AM Gregory Beat via time-nuts
The scans look good on the website. Thanks for the lead Tom. I still like
collecting the original manuals for devices I have. You're right sometimes
harder to find than the gear is!
Bill
On Sun, Dec 6, 2020, 6:10 AM Tom Van Baak wrote:
> Nice find. Original manuals are sometimes harder to
Ulf-
I have the R-20 unit and no manual. I'd be very interested in it or scans
of it please!
Best Regards,
Bill
On Sun, Dec 6, 2020, 5:59 AM Ulf Kylenfall via time-nuts <
time-nuts@lists.febo.com> wrote:
>
> Gentlemen.
> I have salvaged a manual for a Varian R-20 Rubidium Frequency Standard.
Does anyone have any manuals for the later model version of these? I don't
think they've changed too much since FTS and Datum but I acquired 3 of the
symmetricom units with disciplining option without any manuals. I'll take
some pictures of the inside. I'm bringing them over to my lab today.
Good afternoon Dave-
I've got a couple of these and the non military version FRK-L. They're
good units with big Rb cells in them. They last a long time. Also you can
actually work on them. Surface mount components inside. It's worth more
than 5 pounds that's for sure. From what I've read
I attended too. This guy is so theoretical it was kinda hard to put into
practical terms but I will say after reading some of his book he does
understand some novel ways to calculate what's needed for reaching lower
noise levels.
Bill
On Tue, Oct 13, 2020, 1:51 PM Attila Kinali wrote:
> On
Is this why so many really high end devices are basically dumped on eBay
now? I wondered why SRS device was so cheap now considering price of the
SR620. It's too bad they don't work anymore. I'm sure when this happened
it was a HUGE let down to many here that were using them? What's the best
Good morning Kevin-
I use the same HP/Symmetricom units. Another newer brand, which carries
GNSS frequencies, is from GPS Source:
https://www.gpssource.com/collections/gps-splitter
I have even seen some for sale on eBay for better prices used and bought
some myself. Full disclosure I work for
Where I work on a smaller isolated network we have an APC that takes up one
full rack. Most of the rack is modular batteries that are 6 batteries in
19" x 4U high... A bunch of rows of these in one rack with a few units that
are the control and monitoring system. That one rack can support 6 rows
>From I know from measuring voltage references getting linearity in those
kinds of temp ranges not only requires really good sensors but often it
needs to be thermally bonded to what's being measured and often with some
block of material that's makes swings in temperature much more subtle.
Even a
Good evening TGIF!
You've all given me some great ideas. I'm a computer scientist so tell me
what's wrong with this?
Can't I just use a high quality APC backup power system like we use to
power racks of gear in our Telco and compute closets? A good one runs the
full AC load the rack runs on.
I plan to keep BVA powered. My question was how do you accomplish this and
what do you do it with? I've been using PS like for example Fluke
PM2811, Tekpower TP3005T, Dr. Meter HY3005F-3 (these are similar), Sorensen
and some older HP. I've had good luck them all so far. I'm curious if
What power supply do you recommend for the BVA. I'm kinda partial to high
quality linear power supplies. I'm not so concerned about the size or the
efficiency. I'm more concerned with clean power that's stable like the
oscillators I'm trying to power. I'd be interested in what others think?
I
Thanks Tom-
I really appreciate your comment. I've studied your website closely on
this topic. I'm really in awe of the 860x models some of you have access
to 8607, 8608 models some with options! I'd probably be considered a newer
school timenut/voltnut but... I even collect Nixie tube
Isn't there also CDMA? We used a EndRun Technologies system not long ago
that used a small short antenna that could be located inside and didn't
need a cable to the roof for a GPS antenna. This was handy for rooms that
couldn't have anything penetrate the walls at all. It was a good reference
USB 1.0/Low-Speed: 1.5 Mbps
USB 1.1/Full-Speed: 12 Mbps.
USB 2.0/Hi-Speed: 480 Mbps.
USB 3.0/SuperSpeed: 5 Gbps.
USB 3.1/SuperSpeed: 10 Gbps.
This is the actual bitrate for these serial interfaces.
Bill
On Wed, Jul 8, 2020, 5:16 PM jimlux wrote:
> On 7/8/20 4:40 PM, Hal Murray wrote:
> >
> >
If the power is cycled on one of these will it always go into attention
mode yellow until cleared? Or will it go green continuous operation all in
it's own? If one of these has been on the shelf a while is it common for
one even with a good tube to report attention yellow for a while until tube
Does anyone have any good docs or configuration experience with setting up
timelab for FSA3011A? I'm curious what the best settings to start with
are? I'm used to using SRS SR620, Pendulum, and HP 5313xA counters so far
with timelab. The DTMD are new to me. I've got a bunch of Rb, OCXO, and
It's pretty legit and can run like any other Arduino does. With 100Mbit
physical Ethernet built in that's pretty big for a tiny board. It
supports the precision time protocol (PTP). Also known as IEEE 1588, this
protocol allows for synchronizing connected devices with sub-microsecond
precision.
I've been trying to find a base PCB design to use too. In the interim I
bought some boards from Gerry Sweeney that sells them for HP5313x frequency
counter OCXO upgrades and supports different footprints. Open source
design is even better. OSHpark is great. Please post it!
Bill E.
On Tue,
I bought a DATUM ExacTime 6010 today that looks to have fully loaded option
board on it. It'll be interesting to see what built in LO it has. It
looks to have GPIB. I know some of these have firmware issues that were
updated by symmetricom for leap second issues which required replacing an
Wes-
A great resource for info is the BG7TBL master thread at eevblog. We track
everything we know about these units to compare them:
https://www.eevblog.com/forum/testgear/bg7tbl-gpsdo-master-reference/
Bill
On Sun, May 3, 2020, 6:14 AM Wes wrote:
> The seller and the PO did a yeoman job
Did you get a newer one with late 2019 at least on the front BG7TBL panel?
The one I got doesn't have the frequency offset bug and works really well.
It locks on multiple birds really quickly. For the money it's hard to
beat. I've been comparing it to my Thunderbolt E. It obviously doesn't
Looking at the datasheet it doesn't look like you'd win any ADEV
competitions with it but it's small and the DCTXCO version would be nice to
use the I2C interface and it says frequency control resolution as low as 5
ppt. It has uses I can see.
Bill
On Fri, May 1, 2020, 5:50 PM Richard Solomon
is new almost.
Bill
On Sat, Apr 25, 2020, 6:07 PM Bryan _ wrote:
> They make quite a few models which one are you recommending?
>
> -=Bryan=-
>
>
> From: time-nuts on behalf of Bill
> Notfaded
> Sent: April 25, 2020 5:38 PM
> To:
I totally agree with the Metcal soldering station!!! I'll never go back to
anything else. I don't even use a scope. I bought some magnifying glasses
with 5 sets of different power lenses you wear like glasses. It has built
in led light and adjustable strap that hold it on your head off Amazon.
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