donvuko...@gmail.com said:
> A few years ago I had been building some LED clocks for friends, more art
> then electronics.
...
> People keep saying there are WWVB chips available, but I can not find any
> chips.
If you are using LEDs (rather than LCD), I assume you are not running off
batterie
> I have an HP Z3805A with the nice faceplate and 6 leds on the front. I also
> have a Z3801A also with 6 LEDs. What is the difference in the com ports?
> The Z3805A works fine with a standard 25pin to 9 pin adapter. The Z3801
> does not. ...
The Z3801A comes setup for RS-422. The board is
All,
I have completed a write-up on how to make the REF-0 run standalone. As
there is a lot to cover, I decided to split it up into two (or more) parts.
This first part summarizes what is required on the interface pins, and
details what I have discovered about the serial string timing. If you know
On 8/9/15 7:57 PM, John Allen wrote:
Hi Jim -
You wrote:
At some point, multiproject wafers (like MOSIS) might become a hobby
product. So far, it's in the "several kilobuck" minimum purchase, and,
as well, the tools aren't easy to come by. Or, more properly, good
design tools are expensive, ted
I wish to thank you all for the information presented here about WWVB
receivers.
A few years ago I had been building some LED clocks for friends, more
art then electronics.
Those clocks had a WWVB receiver I got from Digikey.
Today I am re-visiting those clocks as Word Clocks.
Letters instea
Hi Jim -
You wrote:
At some point, multiproject wafers (like MOSIS) might become a hobby
product. So far, it's in the "several kilobuck" minimum purchase, and,
as well, the tools aren't easy to come by. Or, more properly, good
design tools are expensive, tedious design tools are free.. you CA
Excellent. The words can be dumped to give a better idea about what's going on?
Bob Camp
> Hi
>
> Actually it’s PForth, but yes it’s Forth. The same “dump the code” approach
> used by a crazy pair of people back a while on the Z3801 applies equally well
> to these devices.
>
> Bob
>
>> On Aug 9, 2
On 8/9/15 4:33 PM, Bob Camp wrote:
Hi
If you never have tried to keep an IC in production, there are some basic things
that may not be very obvious:
There's always Rochester Electronics.. "leaders in the trailing edge"
(no kidding, that's their slogan)..
They buy old fabs, masks, etc, and
I am sure this has been covered, but I did have much luck in the archives.
I have an HP Z3805A with the nice faceplate and 6 leds on the front. I also
have a Z3801A also with 6 LEDs. What is the difference in the com ports?
The Z3805A works fine with a standard 25pin to 9 pin adapter. The Z3
Hi
> On Aug 9, 2015, at 6:56 PM, Donald wrote:
>
> On 8/9/2015 2:16 PM, Bob Camp wrote:
>> Hi
>>
>> Ok, that’s a 20 year old IC. When it talks about doing WWVB, it’s talking
>> about
>> the AM modulation format. It’s not talking about the new phase modulation
>> approach.
>> These are the ch
Hi
If you never have tried to keep an IC in production, there are some basic things
that may not be very obvious:
1) Chip geometries shrink fast. A 4 year old production geometry is essentialy
obsolete.
2) Manufacturing lines either are retired or re-tooled to the new rules on a
regular basis
Am 09.08.2015 um 21:48 schrieb Pete Lancashire:
100% 2nd the thanks to all.
OMG. 27 bytes of good technical content in a 19.7 KBytes message with 13
levels of citing.
Please, everybody, snip the context that is no longer needed.
regards, Gerhard
__
On 8/9/2015 2:16 PM, Bob Camp wrote:
Hi
Ok, that’s a 20 year old IC. When it talks about doing WWVB, it’s talking about
the AM modulation format. It’s not talking about the new phase modulation
approach.
These are the chips that probably will disappear completely once the chips for
the newer f
A reminder: my "collection" of Z3810AS notes can be found at
http://do-nyc.bodosom.net/.
I'll keep it around until there's something better.
On Sun, Aug 9, 2015 at 4:18 PM, Bob Camp wrote:
> Hi
>
> Actually it’s PForth, but yes it’s Forth. The same “dump the code” approach
> used by a crazy pair
Hi
Maybe a little more on “why demodulate the phase mod?”.
1) The signal to noise of the recovered data stream will be significantly
better with the phase mod data. The NIST paper is correct about that.
That alone makes it a neat thing.
2) The interference rejection of the phase mod approach
Hi
Actually it’s PForth, but yes it’s Forth. The same “dump the code” approach
used by a crazy pair of people back a while on the Z3801 applies equally well
to these devices.
Bob
> On Aug 9, 2015, at 4:02 PM, Don Latham wrote:
>
> Does anyone know if the underlying tongue of these devices is
Hello Time-nuts,
I am trying to resurrect an old Datum TS2000 time server (which uses a
Bancomm BC620AT card) and need the cable schematic for the interconnection
between the time server and the Trimble Acutime 2000 antenna.
The TS2000 uses a high-density DB-15 connector, the Acutime 2000 uses a
> This data sheet is one of a few receivers from a few vendors:
> http://www.datasheetcatalog.com/datasheets_pdf/U/4/2/2/U4221B.shtml
>
> Looking at the data sheet link shows the internals of the receiver chip.
>
> This chip outputs the serial stream of the WWVB pwm data.
>
> From there any MCU can
Hi
Ok, that’s a 20 year old IC. When it talks about doing WWVB, it’s talking about
the AM modulation format. It’s not talking about the new phase modulation
approach.
These are the chips that probably will disappear completely once the chips for
the newer format
show up.
Bob
> On Aug 9, 201
Does anyone know if the underlying tongue of these devices is FORTH?
Don
Bob Camp
> Hi
>
> And my thanks to all the others who worked on this project as well !!!
>
> Bob
>
>> On Aug 9, 2015, at 11:26 AM, D W wrote:
>>
>> A quick update for everyone. I have successfully gotten a REF-0 to run
>> st
On 8/9/2015 12:01 PM, Bob Camp wrote:
< snip >
Back to my original comment, These boards and chips are no longer
available in the US.
From the UK I have purchased some older boards and they do work as
described.
After all the discussion, I guess WWVB is no longer a profitable market.
Buying
100% 2nd the thanks to all.
On Aug 9, 2015 12:07 PM, "Bob Camp" wrote:
> Hi
>
> And my thanks to all the others who worked on this project as well !!!
>
> Bob
>
> > On Aug 9, 2015, at 11:26 AM, D W wrote:
> >
> > A quick update for everyone. I have successfully gotten a REF-0 to run
> standalone
On 8/8/2015 11:16 AM, Bob Camp wrote:
HI
Discrete as in resistors and transistors or discrete as in “stuff plus an MCU”?
To be clear(er):
This data sheet is one of a few receivers from a few vendors:
http://www.datasheetcatalog.com/datasheets_pdf/U/4/2/2/U4221B.shtml
Looking at the data sheet
Hi
And my thanks to all the others who worked on this project as well !!!
Bob
> On Aug 9, 2015, at 11:26 AM, D W wrote:
>
> A quick update for everyone. I have successfully gotten a REF-0 to run
> standalone. I am using an AVR, an inexpensive GPS module and very minimal
> circuitry. The 'NO
Hi
Like it or not, the world is going to BGA’s. Even the “fine pitch” leaded stuff
is slowly going away. You might or might not like soldering a fine pitch IC.
Doing a BGA at home - sorry, not for me. I doubt it’s on the “fun list” for
anybody else either. We had better all get used to the idea
I looked at the site its the typical cmall board with everything on it.
Saves you the trouble of doing that very fine soldering.
No antenna.
Regards
Paul
WB8TSL
On Sat, Aug 8, 2015 at 1:16 PM, Bob Camp wrote:
> HI
>
> Discrete as in resistors and transistors or discrete as in “stuff plus an
> MC
Dan,
Jeze I didn't even plug my Ref 0 in yet. Look forward to your details
and code.
Even if you did find things wondering at least you have the messages needed
to make the Ref track and Bobs emails making for a pretty complete approach
thats simple. The devils always in the details but a great
A quick update for everyone. I have successfully gotten a REF-0 to run
standalone. I am using an AVR, an inexpensive GPS module and very minimal
circuitry. The 'NO GPS' light is off, and SatStat shows it is locked and
disciplining to the 1PPS.
The stability of this needs to be assessed for a da
HI
Discrete as in resistors and transistors or discrete as in “stuff plus an MCU”?
Bob
> On Aug 7, 2015, at 11:33 PM, Donald wrote:
>
> On 8/7/2015 4:30 PM, Clint Turner wrote:
> > ( very detailed explanation snipped )
>
> Thank You for your explanation, I had thought of this as well, but I d
Ulrich,
If you're interested in a very good 5MHz OXCO, then I recommend the MTI
Milliren model 260. (see Ebay #
271915776504). The data sheet is available.from several places, including
MTI's site. The daily aging rate for it is spec'ed at 5e-11, thermal
stability is 2e-10 over -30C to +70C. T
Hi
All 10811 OCXO’s have 10 MHz 3rd overtone SC cut crystals in them. They are the
first commercial (as opposed to military) OCXO to use the SC. The target was
good
phase noise rather than good short term stability. They did quite well for the
era in
terms of phase noise.
Back then and now,
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