one DCF77 receiver is described here:
http://www.compuphase.com/mp3/h0420_timecode.htm
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
73
KJ6UHN
Alex
On 8/11/2015 3:59 PM, Bob Camp wrote:
Hi
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.
Bob
On Aug 11, 2015, at 8:18 AM, paul swed <[email protected]> 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
already.
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.
Regards
Paul
WB8TSL
On Tue, Aug 11, 2015 at 3:14 AM, Chris Albertson <[email protected]>
wrote:
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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