For that price (the ND-4), you can get a new NTP-synced PoE-powered clock:
http://www.brgprecision.com/products/synchronized_clocks/poeclocks.php
I built a time display with a Raspberry Pi, an Adafruit GPS, and a
Fundamental Logic USB7 serial LED display, but the numbers didn't flip
elegantly or
A while back I purchased a Symmetricom ND4 clock on eBay -- it was lasted
as "Not Working / for parts only", and it turns out that was true -- the
processor board had issues. I wasted much time trying to fix it, and then
simply removed it -- I'm now using a Raspberry Pi Zero to drive the display
That is a great price and the shipping is $12 for a rack mount piece of
equipment.
How on earth can he do the shipping for that cost?
Regards
Paul.
On Fri, Jun 15, 2018 at 2:51 PM, Bob Bownes wrote:
> IRIG-B generator/displays candy had on eBay for very little money. There’s
> one currently
IRIG-B generator/displays candy had on eBay for very little money. There’s one
currently listed for about $10.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F202337773272
Feeding one of these with the aforementioned NTP to IRIG – B is the easy
solution. And
At work we have POE LED clocks, I think 2.5", circa $400-$500. So your $300
price you've been seeing is about right.
In terms of homebrew:
I bought a bunch of 3.5" high green Seven-segment displays 10+ years ago.
Cheap, really cheap at the time!
Was always intending to build a 6-digit clock
Hi
There are an enormous number of displays out there that will interface with the
little boards. You can spend a little or you
can spend a *lot*. At least in terms of size, it is a bit of a “you get what
you pay for” sort of thing. Some of the larger LED
arrays look pretty impressive. Cost
My reason to hack up a nice clock display is because no matter what I can't
make my home brew stuff look as nice.
So to me its a pile of displays in a nice rack box that I hook a processor
to and do what ever I like.
Reversing out the display methods pretty easy as they are typically
multiplexed.
Thanks, all - sounds like either finding a cheap IRIG display or hacking up
a pi/arduino/etc. version will be the path forward. The IRIG displays I
can find quickly on ebay are still priced for people building music
studios, so...
RPi 3 B+ supports PoE with an extra hat, and you can get
>From 2002, 5 million samples, 5065A vs. 5071A, drift rate 2e-12 per month:
http://www.leapsecond.com/pages/doug-rb/
/tvb
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What about the clock part of the old AN/GSQ-53A frequency/time rack?
It wasn't NTP of course, but ran off of 1 MHz (as I recall) and
generated IRIG-B for remote displays. The rack included a nice Sulzer
crystal oscillator (plus a spare), later upgraded to HP rubidium RVFS
(5061A?).
There
Hi
I would not find it at all surprising that any of the older Rb’s are running
below
1x10^-11 / month these days ( after a good run-in). Below 1x10^-12 is pretty
amazing.
The FRK’s will normally hang out a bit above that point. Indeed, getting all of
the pressure
and temperature stuff
By the way I have hacked IRIG B using a proc called SXB and basic language.
The specs are out there and its not all that hard.
Two tricks that really simplify it. (Everything could be done in software)
Use a stable external sine wave 1 KHz oscillator. I used a epson dip
oscillator pretty stable.
One of the cheapest NTP servers that can be built would be an arduino Uno, CE
version for around $10, an LCD display shield with buttons for $15 and an
Ethernet shield for $8.95. But getting all that to stack didn’t work, so I had
to use jumpers to the LCD part shield.
Then add one of the 6
Hal,
I remember there being such a thing, but a search of the ntp site turns up
nothing. Anything you can provide would be most welcome.
Thanks!
Bob
On Fri, Jun 15, 2018 at 12:20 AM, Hal Murray
wrote:
>
> bow...@gmail.com said:
> > I’m still hunting for something that will take NTP in and
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