[time-nuts] The ultraAtomic clock for home

Mike Seguin n1jez at burlingtontelecom.net
Fri Apr 7 13:18:24 EDT 2017

Does anyone know of a clock with digital readout that uses the CME-8000?


On 2017-04-07 13:03, Tom Van Baak wrote:
>> 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
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Mike, N1JEZ
"A closed mouth gathers no feet"

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