Does anyone know of a clock with digital readout that uses the CME-8000?
Tnx,
Mike
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" <paulsw...@gmail.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@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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73,
Mike, N1JEZ
"A closed mouth gathers no feet"
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