[time-nuts] wtd: WWVB info
alex at pcscons.com
Tue Aug 11 22:29:14 EDT 2015
one DCF77 receiver is described here:
there are two files to download one for implement the MSF60 the other to
implement the DCF77
* A script file that implements a simple DCF77 decoder
<http://www.compuphase.com/mp3/dcf77.zip>, that you can put on a
CompactFlash card and run.
* A script file that implements a simple MSF60 decoder
<http://www.compuphase.com/mp3/msf60.zip>, that you can put on a
CompactFlash card and run.
I don't know the details of the difference of the transmission between
the wwvb and the MSF60, but they should be similar
On 8/11/2015 3:59 PM, Bob Camp wrote:
> It’s *far* more likely that Everest will sell the IP on the receiver to each of the
> “usual suspects”. Then the watch guys will each incorporate it in their micro
> BGA chips that sit inside this or that watch. It will be in the same chip as all
> the stepper drivers, display drivers, and other junk. Those are the guys who
> have the money to buy the tech first.
> Once they have it going (and the first to sign up probably gets a 2 year exclusive),
> it migrates from the high end watches to the less exciting ones. At some point the
> IP cost drops far enough for one of the clock guys to drop it onto an all in one BGA
> for their gear. Might it be a bigger package - maybe. They probably have a bunch of
> LCD segments to drive so maybe not. I’d expect it in a talking / walking / clock / radio/
> weather station / phone / popcorn popper combo device first.
> Until that part of the world is fully loaded with parts, there is not a lot of incentive
> to go much further with it as any sort of stand alone receiver on a chip. That end of
> the market is way smaller than even the clock market. Doubly so unlikely since it’s still being
> fed quite adequately by chips that went out of production years ago. The only slight
> chance would be to get some of the short run of demo chips that people will do to
> validate the IP. You might still have to wire bond them up to use them ….
> Thus the desire to get a sub $100 set of boards up and running as a very high performance /
> modern radio. Even with fancy parts it’s not going to be over $200 for the hardware. If you go
> with PHK’s basic approach (no FPGA / no fancy ADC / all software) it *might* be $24.00 (single
> piece board) plus shipping from Mouser (1,142 in stock) with a QVGA display included.
>> On Aug 11, 2015, at 8:18 AM, paul swed <paulswedb at gmail.com> wrote:
>> If you need time the GPS chips are the way to go.
>> Heavens for $11 I think you get the complete system with antenna.
>> The old wwvb chips do still work as well as they ever did. They detect AM
>> and thats still a part of the format. They are as reliable as they ever
>> were. (Sort of not if you live on the East coast) due to facts stated
>> The new wwvb format indeed does improve on all of the issues stated. There
>> are papers written about it and are good reads.
>> So it could be worth while to build up a discreet receiver PLL and such to
>> recover the data. But as a company Everset has to find the market that will
>> keep them in business. I suspect thats why we do not see any products.
>> If they are successful I will expect something like the following.
>> Clocks that can decode time easily 99% of the time per day. I have measured
>> the am chips and they are sub 30% of the day.That these may be $50 or more
>> to start. They actually consistently work in any orientation. No more must
>> face west.
>> I hope they are succesful. But if you are a builder/programmer everything
>> you need is available.
>> On Tue, Aug 11, 2015 at 3:14 AM, Chris Albertson <albertson.chris at gmail.com>
>>> You might look into GPS devices. They aren't quite as cheap as the WWVB
>>>> chips, but there are lots of them on the market.
>>> Yes GPS receivers can be very cheap and self contained and much easier yo
>>> use than those WWVB chips. I have two of the chips. I don't think they
>>> work now that WWVB has changed format and even back in the day they only
>>> worked for a few hours at night. GPS is better.
>>> But there is another good source for correct time. Most people today have
>>> WiFi in their house, at school and at work. If the clock is going into an
>>> area where WiFi is available then it can connect to NTP. If the clock
>>> connects to WiFi you can save money and parts count by not needing any
>>> physical controls on the clock for setting or to control options as all
>>> that can be done from a smart phone's web browser
>>> Chris Albertson
>>> Redondo Beach, California
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