[time-nuts] The ultraAtomic clock for home
paulswedb at gmail.com
Fri Apr 7 17:36:29 EDT 2017
Hello to the group. No there is not a way to bring that information out.
In fact it samples things much like other Time nuts threads have been
discussing on GPS.
It then stores the samples and figures out the data. So every 1.5 minutes
you get a complete sentence. Its actually a bit more tricky then that
because there are several modes to operate with. After getting a sentence
you can operate in a short mode that allows the system to figure out the
start of a minute and the tick.
So that all sounds very bad. But actually its not.
The sentence is quite complex especially with the error coding. Then there
are also bits you simply can't easily determine because they can be
changed. (Not that I have actually seen this) Obtaining the sentence allows
you to fabricate the next sentences and then flip the incoming carrier one
way or the other to remove the BPSK.
That is exactly how the cheat'n-d-psk-r works though I just grab GPS time
and fabricate the message straight out. This all requires 64 bit variables
Yes I could indeed use this wwvb signal. Just lazy and the cheatn d-psk-r
GPS works very well so have not been motivated to change.
Tom thanks for Orens email.
On Fri, Apr 7, 2017 at 3:20 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
> > On Apr 7, 2017, at 1:16 PM, John Ackermann N8UR <jra at febo.com> wrote:
> > Is there any way to derive carrier phase from these chips? Or to get
> raw modulation data that might make it usable as the front end to one of
> PaulS's de-PSKers?
> Unless it shows up on one of the test points on the photo’s, I suspect
> not. The epoxy over wire bond construction
> approach is low cost, and not very experimenter friendly.
> The good news is that they do prove the new modulation works pretty darn
> well in a number of locations. That at least
> adds to the justification to do up some sort of receiver that works with
> > On Apr 7, 2017, 1:04 PM, at 1:04 PM, Tom Van Baak <tvb at LeapSecond.com>
> >>> Very good catch it is *not* the cme8000 chip. Thats a classic am
> >> receiver.
> >>> It is the everset chip. Sorry for mis-leading.
> >> Hi Paul,
> >> I can confirm (from talking with the guys backing it) that, yes, it's
> >> the EverSet ES100, in die form (CoB). I believe you and I have both
> >> used the early Xtendwave dev kits with the ES100 as SMT part. It's nice
> >> to see the chip still lives and finally made it to a product!
> >> I uploaded more ultrAtomic info and tear-down photos:
> >> http://leapsecond.com/pages/ultratomic/
> >> I encourage those of you who just bought these clocks to do some
> >> experiments. The obvious ones are:
> >> 1) See how long it takes to acquire the correct time, at all sorts of
> >> different and difficult environments, compared to the traditional WWVB
> >> clocks. Check for off-by-one second, or minute, or hour errors.
> >> 2) See how accurate they really are. For clocks like this I use a
> >> variety of piezo sensors (feel the tick), acoustic sensors (hear the
> >> tick), optical sensors (see the tick), and mostly electrical sensors.
> >> Some of these are passive (non-destructive) timings and good enough.
> >> Others require some level of disassembly but are more precise. For a
> >> stepper motor clock it's easy to tap onto the coil connections and get
> >> a sharp pulse every second or two. Then use a time interval counter, or
> >> picPET, or TICC, or PC-based PPS-capture to collect readings. Note the
> >> signal level is usually low power and below typical TTL levels, and
> >> they do NOT drive 50R!
> >> If all goes well, we can soon talk about a time-nuts special where we
> >> get someone to make a timing board or disciplined timing board based on
> >> the ES100 chip. The bad news is that at the same price it would be like
> >> a million times worse than GPS. The good news is that lots of
> >> applications need only ms level timing; there are places where WWVB is
> >> receivable and GNSS is not; and then there's the redundancy and
> >> low-power factor.
> >> /tvb
> >> ----- Original Message -----
> >> From: "paul swed" <paulswedb at gmail.com>
> >> To: "Discussion of precise time and frequency measurement"
> >> <time-nuts at febo.com>
> >> Sent: Friday, April 07, 2017 5:08 AM
> >> Subject: Re: [time-nuts] The ultraAtomic clock for home
> >> Tom
> >> Very good catch it is *not* the cme8000 chip. Thats a classic am
> >> receiver.
> >> It is the everset chip. Sorry for mis-leading.
> >> Regards
> >> Paul
> >> WB8TSL
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