Seems appropriate that it falls on a Two's-day.
Tom Holmes, N8ZM
-Original Message-
From: Jeremy Nichols
Sent: Monday, February 21, 2022 9:23 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Re: too many two's
On Mon, Feb 21, 2022 at 5:24 PM Tom Van
Hi!
I'm building a clock source for my LMX2594 15 GHz PLL.
I want to max out the LMX2594 phase comparator frequency;
that means 300 MHz for fractional operation. The VCXO is a
100 MHz ECOC-2250 crystal oven by ECS because I have it,
and it's tripled.
Dumping its output into a pair of 1G125
> But its supposed to be accurate to 500 ps and I want to verify that.
500ps is one cycle at 2GHz. A cache miss is much longer. Any timing
involving software is unlikely to be that accurate.
Gigabit ethernet (1000BASE-T) runs at 125MHz - 8ns. So even if you have
hardware level timing, you
On Mon, Feb 21, 2022 at 5:24 PM Tom Van Baak wrote:
> Get your cameras ready. Coming up in an hour:
>
> 2022-02-22 02:22:22 UTC = MJD 59632.098866 = time_t 1645496542
>
> or second chance, 20 hours later:
>
> 2022-02-22 22:22:22 UTC = MJD 59632.932199 = time_t 1645568542
>
> /tvb
>
Tom,
Danger - OFF-TOPIC !!
You're on the money, but likely for the wrong reason.
Today at 22mins past 2 is known as 'Richie Benaud day'. Benaud was a
well-known and loved Aussy cricket commentator who died in 2015. While
exceptional at playing and a brilliant commentator, he unfortunately
Get your cameras ready. Coming up in an hour:
2022-02-22 02:22:22 UTC = MJD 59632.098866 = time_t 1645496542
or second chance, 20 hours later:
2022-02-22 22:22:22 UTC = MJD 59632.932199 = time_t 1645568542
/tvb
___
time-nuts mailing list --
Hi Joe,
On 2022-02-21 20:52, Joseph Gwinn wrote:
time-nuts Digest, Vol 214, Issue 22
On Sun, 20 Feb 2022 03:30:27 -0500, time-nuts-requ...@lists.febo.com
wrote:
Message: 5
Date: Sun, 20 Feb 2022 01:13:50 +0100
From: Magnus Danielson
Subject: [time-nuts] Re: Types of noise (was: Phase Station
time-nuts Digest, Vol 214, Issue 22
On Sun, 20 Feb 2022 03:30:27 -0500, time-nuts-requ...@lists.febo.com
wrote:
>
> Message: 5
> Date: Sun, 20 Feb 2022 01:13:50 +0100
> From: Magnus Danielson
> Subject: [time-nuts] Re: Types of noise (was: Phase Station 53100A
> Questions)
> To:
Hi
I suspect that somebody somewhere in the documentation
process got accuracy and resolution a bit crossed up.
Resolution would be pretty easy to observe.
In a broad sense, to be accurate to 1/2 ns, the time base in
the card would need to be pretty good. Even with a good
onboard reference,
Yes, 1Hz observed is 1Hz on the multiplied up signal, which at 5GHz is
2E-10 on the reference causing it
The FFT process does indeed smear out faster transitions, so you need to
flip between different FFT sizes to see fully what is happening.
If you use a prog like SPECTRAN to view the audio
Hi,
mar...@ptsyst.com wrote:
Hello,
I have a board that is a NTP server. Any ideas on how to test its accuracy?
To check it roughly I sync my PC to it, maybe set the time to +3 hours and
confirm my PC follows.
But its supposed to be accurate to 500 ps and I want to verify that.
The
Hello,
I have a board that is a NTP server. Any ideas on how to test its accuracy?
To check it roughly I sync my PC to it, maybe set the time to +3 hours and
confirm my PC follows.
But its supposed to be accurate to 500 ps and I want to verify that.
Best Regards
Martyn
Andy,
Thanks for these references
Using two 5GHz PLL's, one hard referenced to the in-house standard and
the other to the TCXO under test and the outputs of the PLL's send into
a mixer producing a 10kHz output send into a PC for FFT analysis made
the performance of the TCXO very visible.
Can I
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