[time-nuts] Re: pps pulse timestamp device

[Jeremy Elson]

I've also been tinkering with building an STM32-based timestamper, though
my goal of making it more broadly available for sale keeps getting
postponed. It has 6ns resolution and ultimately will have 4 channels; I
project it'll cost about $50. However if you'd like to play with one I can
send you a 2-channel prototype.

As Bob mentioned, virtually every timestamper including professional lab
gear will require an external timebase to get the kind of stability you
want. The usual arrangement is for the timebase to feed a 10MHz reference
signal into the timestamper. The best option in my opinion is a GPS-steered
oscillator. Time-nut Nick Sayer has an excellent one (
https://www.tindie.com/products/nsayer/gps-disciplined-ocxo/). You can also
buy cheapies on eBay such as https://www.ebay.com/itm/166333117355; my
friend has that one and has been satisfied with it.


On Sun, Feb 11, 2024 at 9:41 AM Bob Camp via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hi
>
> I 100% agree that the TICC is a great choice. One very minor point:
>
> Like anything else, you will need an accurate / stable “standard” to feed
> it with. This is also true of any reasonable alternative I can think of.
> There are a range GPSDO and telecom Rb options to sort through to meet that
> need.  Yes, there are a *lot* of possible choices, those are the ones that
> most folks turn to.
>
> Bob
>
> > On Feb 11, 2024, at 11:52 AM, John Miller via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > Juan,
> > Check out the TAPR TICC: https://tapr.org/product/tapr-ticc/
> >
> > John K1QLN
> >
> >
> > -------- Original Message --------
> > Subject: [time-nuts] pps pulse timestamp device
> > Date: 2024-02-11 7:37 am
> > From: juan--- via time-nuts <time-nuts at lists.febo.com>
> > To: time-nuts at lists.febo.com
> >
> > Hi all,
> >
> > I am looking for a cheap device (e.g. Teansy, micropython board, etc)
> that would help me measure with ns resolution some pulses at one event per
> second rate (gps pps).
> >
> > It would need quite a stable clock such that any jitter would be
> attributable to the pulse signal.
> >
> > Any ideas what is the best way around this nowadays?
> >
> > Thanks,
> > Juan.
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