Strange. I have three of these that I have tracked pretty closely for several
years. To my knowledge, I’ve never experienced any circumstance in which they
were off by one or more seconds.
Regarding the holdover behavior, I have not tested that. But if you believe
that the current behavior
LeoNTP note:I've seen these units infrequently return NTP responses
that are off by N-seconds (N is a small integer.)
I could not determine the root cause.
One other oddity. The returned NTP root dispersion is always 0, even when
the unit runs in holdover mode.
The support people say that
On 11/22/21 7:51 PM, Bill Notfaded wrote:
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
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
On 11/22/21 10:25 AM, Andy Talbot wrote:
But you don't need a DDS route to get 1 PPS from any frequency that is an
exact multiple of 1Hz.
I clock a PIC with 10MHz from a master reference. An interrupt is
generated at an exact submultiple of this, and additional code outputs a
pulse every 25
On 11/22/21 10:19 AM, Gerhard Hoffmann wrote:
Am 22.11.21 um 18:31 schrieb Erik Kaashoek:
Some time ago I needed a output at 10,00.001Hz so I tried to do
that with a SI5351.
Using pure integer math (as the PLL and divider register are
integers) i search for a combination of 3
But you don't need a DDS route to get 1 PPS from any frequency that is an
exact multiple of 1Hz.
I clock a PIC with 10MHz from a master reference. An interrupt is
generated at an exact submultiple of this, and additional code outputs a
pulse every 25 clocks (clock freq = Fosc / 4)
Or from
Hey Guys,
I'd like to ask for opinions from the list if I could.
I have a need to put a couple GPSDOs on some remote locations, 10MHz
output plus NTP. Found some Spectracom 9183s as well as some
Symmetricom XLi units on EBay that look like they'd fill the bill.
The 10MHz will be mostly
We had a PN9000 at work some time back. As Rick says it came as a system. The
PC ran Windows 98 and the software IIRC came on a floppy. When the PC failed we
were well and truly stuck, by that time Aeroflex were no more and we had no
support. We did try to get it going on another PC, but no go.
Yupp
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y (Reformed USNSG CTM1)
les...@veenstras.com
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home:+1-304-289-6057
US cell +1-304-790-9192
Jamaica
On 11/22/21 8:52 AM, Jeremy Elson wrote:
I did not see any such setting in the Rigol, but I'll check again. in April
I did write to Rigol to report the problem and had the following (abridged)
conversation with support:
Me:
"I recently tried to use your DG1022Z signal generator to generate one
The frequency setting error is the clock frequency divided by the
accumulator length, at least in a DDS
If it has a 32 bit NCO clocked at 200Mhz, the setting error will be
200MHz/2^32 = 0.046Hz.
Max possible error will be 2^-32 of te hclock.
Not sure how that AWG would be set up, but if you can
Some time ago I needed a output at 10,00.001Hz so I tried to do that
with a SI5351.
Using pure integer math (as the PLL and divider register are integers) i
search for a combination of 3 divider/multipliers that gave the least error.
If the reference frequency is not integer related to the
Well, someone snatched that up quick.
> On Nov 21, 2021, at 19:11, Denny Page via time-nuts
> wrote:
>
> Highly recommend the LeoNTP. If you are in the US, there is still one in
> stock here:
>
> https://v3.airspy.us/product/upu-leontp/
>
> Denny
>
>> On Nov 21, 2021, at 18:52, W7SLS
Andy,
I was thinking in the same direction - the device can create arbitrary
waveforms so they're almost certainly using DDS. So I assumed it was some
sort of round-off error. I just can't quite convince myself of this because
it seems like round-off errors would be bigger, i.e. an error of one
Could the Rigol be using a DDS / NCO lookup approach to its frequency
generation? In which case you'll be subject to rounding errors on the DDS
increment, whose maximum magnitude will be dependent on the register
length.
Andy
www.g4jnt.com
On Mon, 22 Nov 2021 at 16:53, Jeremy Elson wrote:
I did not see any such setting in the Rigol, but I'll check again. in April
I did write to Rigol to report the problem and had the following (abridged)
conversation with support:
Me:
"I recently tried to use your DG1022Z signal generator to generate one
pulse-per-second (pulse mode, frequency
A couple of years ago, I acquired a related “time-nuts” NTP appliance. As
usual, it was not working properly and waited for service time on my
electronics workbench.
The ESE ES-188 is an NTP referenced Master Clock and Time Code Generator (circa
2007).
It displays nine digits (Day of Year,
>After finding some outrageously priced VFDs on eBay ($230 plus tax), I
located a source for a Samsung INB-12MM53T from a company called PDA Parts.
>They wanted "only" $108 plus shipping, but all things considered, it's a
relative bargain.
Turns out that these folks didn't actually have any
GPS with any serial port can be used (along with PPS) for accurate time.
You write a routine for a microcontroller that maintains time keeping and
clock it from the 1 PPS signal. That gives you correct display of accurate
time. You read the NMEA from the GPS and use it to set your registers on
time.isan...@gmail.com said:
> but I am curious to see if I could sync up with some of you guys who seem to
> have some pretty cool set-ups.
GPS has taken over the time-distribution business.
If you want to use GPS, there are 2 ways to go.
You can get a simple GPS receiver and plug that into
On 22/11/2021 02:29, McFail Troll wrote:
Hi all, I am new to the mailing list, and pretty new to timing stuff in
general. I wanted to ask if any of you folks who have a more advanced
set-up (synchronization via gps/radio, or just a well working rubidium
clock or something) maintain a solid
Hi.
You might want to ask about that, on the Marconi Instruments, and/or IFR
groups on groups.io
https://groups.io/g/Marconi-Test-Instruments
https://groups.io/g/IFR-Monitors
There are some knowledgable ex employee types lurking on those lists who
might know of a lead to follow, or where
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