Most of the good data centers I’ve used either offer a connection to a stratum
1 server or are more than happy to put a antenna on the roof. Many offer
microwave as a third redundant circuit path, which requires an antenna. All for
a price, of course.
When I worked for an ILEC, many moons
Bob,
The hardware is cheap. The software is free. The skills to deploy are
widely available. But...
A cable run from your rack in the middle of the datacenter, through to the
roof, is either impossible or thousands of dollars and weeks of planning.
Data centers can run wires within the
On Fri, Jun 21, 2019 at 9:12 PM Hal Murray wrote:
You should probably setup another web page with just the technical details.
What are you going to do about leap seconds? Smear or not?
DNS for time.cloudflare.com gives 2 IPv4 addresses and 2 IPv6 addresses.
Are
they all equivalent in terms of
One can reduce the gulp factor mentioned by Scott quite a bit by buying
one of the non-connectorized versions from Mini-Circuits and wiring up
one's own BNC connectors.
One thing to keep in mind with these isolating splitters is that the
isolation
between outputs is good only if the impedance of
> Would love to have the feedback :)
Looks good. Thanks.
You should probably setup another web page with just the technical details.
What are you going to do about leap seconds? Smear or not?
DNS for time.cloudflare.com gives 2 IPv4 addresses and 2 IPv6 addresses. Are
they all equivalent
Hi you can always use a resistive splitter
So if you have an output impedance of 50 ohm
You use 2 off 50 resistors to feed 2 off 50 ohm loads / signals to other
equipment with a 50 ohm input
So we have a load comprising of 2 off 100 ohm loads in parallel = 50 ohm
This method is often
As regards the GPSDO, check this out-
http://www.leobodnar.com/shop/index.php?main_page=product_info=107_id=301
I think there's also a US distributor somewhere..
DaveB, NZ
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Don
Meadows
Sent:
As an erstwhile "white-hat" hacker/penetration tester I can say with some
confidence that the threat is real, and that NTP (as with other core services
on the net) really does *need* to be secured.
This isn't just scare-mongering.
David
-Original Message-
From: time-nuts
I don't know anything beyond what Is in the press release, but Cloudflare
generally does good stuff. Their work on the secure protocol is great. Looking
forward to having it supported broadly.
I wouldn't expect the quality of the time from their NTP system to be notably
different from any
Hi
Given the relatively low cost of a GPS based “Stratum 1” NTP, it’s not real
clear
why (at the end of the paper) they go off and “exchange emails individually
with the
organizations that run stratum 1 servers, as well as negotiate permission to
use them.”
to source the root time for the
On Fri, Jun 21, 2019 at 4:03 PM Marco Davids via time-nuts <
time-nuts@lists.febo.com> wrote:
> Opinions, anyone?
>
> https://blog.cloudflare.com/secure-time/amp/
>
> ("Introducing time.cloudflare.com")
>
Would love to have the feedback :)
>
> --
> Marco
>
>
Easy, Cheap, Good choose 2.
I looked at virtually every option I love to build. I settled on
HP 8-way and 4-way unity gain splitters WITH external power supply
ports. I actually retrofitted one with the very hard to find connector.
Easier to find it now... Well worth the cost to
Opinions, anyone?
https://blog.cloudflare.com/secure-time/amp/
("Introducing time.cloudflare.com")
--
Marco
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If you don't need them to be in phase, you could just daisy chain them.
What I do is use a couple of BNC tee connectors, two pieces of coax, and a
50 ohm terminator on the last tee. First coax from GPSDO to first tee,
second coax between tees. Simple and works fine for my purposes.
If phase is
Hi
Cheapest and easiest is to use a power splitter. Ones from Mini Circuits that
are
rated to work at 10 MHz can be had for $20 or less. At some point you run out
of power ….
Building a splitter from NC7SZ125’s is not a all that crazy as a DIY project.
You
can get a dozen or so outputs and
Dan,
I hate to speculate but it's really odd that more than one person is
reporting EFC issues with the Z3801A this week. I wonder if it's a bug
in the Motorola Oncore; the OEM GPS receiver used in the Z3801A (and
other early hp GPSDO). Two events have happened recently:
1) There was a GPS
There is a Trimbo GPSDO on ebay. We have a couple. 252162780444 look to me
a later version of the Tbolt, has an additional board with Power and
amplifiers. One 10 MHz is TTL and the other sine wave. Use the TTL for the
counter.There is an other one on Auction, looks identical has two
Don,
I use a video distribution amplifier. Bought one off eBay for around $12 or so
about 2 years agio, model is Sigma VDA 100A, i am sure there are many suitable
models on eBay.
cheers,
bammi
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A couple of ideas:
Make one:
Several hours and a few $ (cheap if you value your time as free)
agree, not a lot of isolation between the outputs
Case, connector, and three 16.67 ohm resistors
in —> 16.67 ohms —> 16.67 ohms to output 1
Sure, presuming the output is 50Ω, build a 50Ω power divider. The signal
will be 3dB down on each of the outgoing legs vs the input. Plenty of
designs if you google it.
If the output is TTL, feed a 74xx04 on pin 1, send pin 2 to 3 and 5, pick
up the output from 4 and 6. Or choose some other gate
On 6/21/19 7:27 AM, Don Meadows wrote:
Is there an easy, and cheap way to add a splitter the 10Mhz signal
from GPSDO, without going to a distribution amplifier to
feed two different devices?
Just a power divider, or a BNC T, - it's not perfect, but it works.
there's isolation and potential
I appreciate the response on the outer oven. When it goes bad it makes a
heck of a mess.
If its not needed it would be good to turn off. Not to distract from this
important subject. Is there a way to disable the oven and yet make the 3801
think its at temperature. (May not actually feed back to
Is there an easy, and cheap way to add a splitter the 10Mhz signal
from GPSDO, without going to a distribution amplifier to
feed two different devices?
I really don’t want to build a complicated project, or
spend $200.00 dollars for an 8 output distribution amp
off the net. One output would be
Thanks to all who offered advice. I have attached a LH screen shot
showing last night's event. From my limited understanding it looks like
the receiver part is working fine... The EFC had started to dive
however, more than two hours before it went into holdover.
I'd appreciate comments
Hi
Which is why I asked about the EFC ….. they *should* start complaining when the
EFC gets close to limit.
How close? No idea. Are there other parameters it monitors? No idea.
The (useless) heater box around the 10811 in the Z3801 can be opened up. Inside
is a fairly normal 10811. On the
I have a weird one with my Z3801A. Screen shot from GPSCon attached. You
can see the EFC excursion... Maybe the oven in the OCXO is acting up???
Mike
On 6/20/2019 10:25 PM, Mark Sims wrote:
A few months ago, my 3801A started doing this. It was tracking sats well
(several years ago I had to
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