[time-nuts] WWVB Wall and Travel Clocks On Sale
ed_palmer at sasktel.net
Mon Feb 23 21:41:24 UTC 2009
I see. The Hummer clock has a single xtal circuit. When I tried to
monitor it with a scope just now, even in A-B mode with x10 probes, the
data was trash and the clock gives up after about 5 minutes. But if I
leave it alone, it only takes a few minutes to lock in. Same with a
couple of other cheap clocks. I remember that later in the evening when
the signal is stronger, I could monitor it with an analog scope with no
problem. You could decode it just by looking at it.
Brooke Clarke wrote:
> Hi Ed:
> Yes, the one shown on Tom's web page:
> uses two 60 kHz crystals in the filter rather than the single crystal
> like in the C-max CMMR-6P-60 (Digi-Key p/n: 561-1014-ND) that uses a
> single crystal. C-Max is the new name for Temic that made the chip in
> Tom's clock.
> I connected the CMMR-6P-60 to a couple of AA batteries and it's been
> blinking for the last month or two. But that data is very noisy.
> Have Fun,
> Brooke Clarke
> Ed Palmer wrote:
>> Hi Brooke,
>> Is there something special about the Sony clock that you want?
>> Before I found out about Time Nuts & GPSDOs I was looking at using
>> one of these "atomic clocks" as a source of time and /or frequency.
>> Most of them have a point where you can get to the time code.
>> Getting to the 60 KHz carrier was a bit trickier.
>> e.g. I picked up a few Hummer Atomic Clocks on clearance for about
>> $5. The radio is a seperate unit that sends out the time code
>> continuously. The clock takes about 5 minutes to lock in. I'm about
>> 680 miles from Fort Collins.
>> Brooke Clarke wrote:
>>> Hi Tom:
>>> I've looked at dozens of Sony "Dream Machine" clocks on eBay and
>>> none of them have WWVB capability. Some are called preset or self
>>> setting, but these may just be using a button cell back up clock.
>>> What is the model number of your Sony WWVB clock?
>>> Have Fun,
>>> Brooke Clarke
>>> Mike Monett wrote:
>>>> Update on my previous post - tvb has a nice page on WWVB receivers at
>>>> Looks like these receivers might make good wall clocks.
>>>> But for checking GPSDO's - not so good:)
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