The PIC controllers have gone through a large number of iterations
and mask-shrinks over the years and your mileage may vary.
--
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Never attribute
Tom
The voltage coefficient of delay for a 74AC04 is around -300ps/V so with a
tempco of -1.1mV/k for the output of a 7805 this results in an induced delay
tempco of around +0.33ps/K for the 74AC04 due to the voltage regulator tempco.
The typical propagation delay of the 74AC04 is around 4ns
All -- The 2012 test results for the T2-mini, which contains a PIC
divider chip, is here:
http://leapsecond.com/pic/jitter/
It's about 1 ps, or sqrt(2) less because it was comparing two T2-mini
against each other with a common reference. Also note that this
measurement is the sum total of
That entire thread is full of misinformation and should be ignored unless one
understands the difference between random and data dependent jitter.
For a well designed divider with a single output frequency only the random
jitter spec is significant.
One doesn't need a bunch of expensive
On Fri, 07 Jan 2022 12:40:49 -0800, you wrote:
>> The two biggest outside influences on the PICDIV are supply voltage and
>> temperature.
>
>Another interesting influence is the number of outputs that are switching and
>the load on them. In particular, if you have several outputs running at
> Things like soldering and PCB are things I've heard of...
Soldering is pretty basic to low level electronics.
If you want to learn soldering, you might see if any of your neighbors can
help or if your local community college has a class that fits. Or the local
ham radio club... Or the
> The two biggest outside influences on the PICDIV are supply voltage and
> temperature.
Another interesting influence is the number of outputs that are switching and
the load on them. In particular, if you have several outputs running at
different frequencies, the clock-out delay should be
Hi
Setting up a bench to measure clock sources can indeed be expensive.
eBay is one of the ways to find the gear you need at a semi-rational price.
The gotcha there is that the gear may or may not be fully functional. Stuff
from folks like TAPR might cost a bit more. The hassle level often makes
On Wed, 5 Jan 2022 19:42:27 -0800
Keelan Lightfoot wrote:
> When I read that it uses a only a PIC, I was skeptical, but then when I read
> that jitter is in the range of 1 pico second, I was intrigued
It is exactly because it is a PIC that the jitter is so low.
These tiny PIC are very simple
I remember listening to WWV on dads old Blaupunkt. The tubes kept us
warm in the Winter.
Brad
On 1/7/2022 at 3:18 AM, "Bryan _" wrote:, and only after asking those
on the "party line" to hang up, only those over 55 would know what I
am talking about.
-=Bryan=-
And here in the UK, after dialling 123 it was originally "At the third
stroke the time will be HH MM and S0 seconds"
Later, after privatisation, it became "At the third stroke the time
sponsored by Accurist will be HH MM and S0 seconds"
I don't know if it still operates on landlines; on my
> How would you quantify "pretty weak?" You could connect up the components
> correctly, but you could not design a circuit from scratch? Or you are
> worried you will let the smoke out the first project you start?
I just mentioned this to indicate that I have only basic knowledge, as
compared
, and only after asking those on the "party line" to hang up, only those
over 55 would know what I am talking about.
-=Bryan=-
From: Chris Howard
Sent: January 6, 2022 6:56 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Re: Where do people get the time?
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