On the topic of minimum hardware to use a TBolt,
I am interested in observing clock pendulums.
WWV is a long way from Australia and only available with good
propagation.
A GPS receiver will give accurate seconds signals, even if there is
some jitter,
however it is not easy to identify which
The GPS may drop out, so a disciplined oscillator is in order, but
how can you get the GPS signals parsed to identify say minute markers
without running a computer?
There are lots of 8 bit micros that are smart enough to parse the stuff from
a TBolt and wiggle a few pins. You have to be
My pendulum produces pulses at a rate of one per second.
That signal clocks a latch that samples the less significant bits of
my reference oscillator (100kHz or 1MHz)
in a counter.
The latched values drive a 12 bit D-A converter (a R - 2R chain).
So I have a phase signal updated every second,
Yeah, you really do need a display... this is the 21st century... monkeys
got better things to do than count blinkenlights (or read a message scrolling
across a six character LCD).
You need a processor of some sort to decode the TSIP messages. It actually
takes a significant amount of
Hi Neville,
As a thought, you might want to look at a Basic Stamp from Parallax.
These are PIC chips (at least they used to be) coupled with an EEPROM
and are programmed in BASIC. Here's a site for some additional data -
http://www.parallax.com/Default.aspx?tabid=295
Regards,
Bruce Raymond
Yeah, you really do need a display... this is the 21st century...
monkeys got better things to do than count blinkenlights (or read a
message scrolling across a six character LCD).
A simple blinking LED is handy to alert you that there is a problem.
I was probably assuming that you
Sorry, I don't like to contradict,
but I have different experiences made concerning
some statements:
On Sun, 6 Jul 2008 20:48:27 +, Mark Sims wrote:
The Thunderbolt default config is to not save the survey position. Unless you
use some software to save the position, every time you power
As I reported already, Thunderbold seem to restart perfectly alone
once set properly, until I get a problem I have no real control
over it, no information about, and for portable use I need always a
PC.
I think portable is quite different from stationary.
If you move it, you have to
On Mon, 07 Jul 2008 12:21:29 -0700, Hal Murray wrote:
As I reported already, Thunderbold seem to restart perfectly alone
once set properly, until I get a problem I have no real control
over it, no information about, and for portable use I need always a
PC.
I think portable is quite
My pendulum produces pulses at a rate of one per second. That signal
clocks a latch that samples the less significant bits of my
reference oscillator (100kHz or 1MHz) in a counter.
...
but what I would really like is a clock showing UTS in a form that
can be compared to a clock.
That
As I said:
The Thunderbolt default config is to not save the survey position. Unless you
use some software to save the position...
The reason your Thunderbolt does no self surveying at power-on is exactly
becuase you DID use some software to save the position!The TAPR units were
shipped
On Mon, 2008-07-07 at 21:14 +, Mark Sims wrote:
BTW, on 30 July 2017 your Thunderbolt turns into a pumpkin... its
interpretation of the GPS week number fails and it may or may not keep
working. At a bare minimum, the time and date will be wrong (see
ThunderBoltBook2003.pdf page
: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Mark Sims
Sent: 07 July 2008 22:14
To: time-nuts@febo.com
Subject: [time-nuts] Thunderbolt controllers
As I said:
The Thunderbolt default config is to not save the survey position. Unless
you use some software to save the position
The Thunderbolt default config is to not save the survey position. Unless you
use some software to save the position, every time you power it up it will do
a new survey. This takes from 1 hour to several days to complete. After that
you really don't need a controller except for peace of
A very minimal controller might be an AVR Butterfly. It only has a 6
character display and joyswitch. Rather not up to the task,
There is the newer DB101 with the 128x64 bit map display.
http://www.atmel.com/dyn/Products/tools_card.asp?tool_id=4221
I think they really did a botched job on
A very minimal controller might be an AVR Butterfly. It only has a 6
character display and joyswitch. Rather not up to the task, but dirt
cheap (around 20 bucks). It could display a minimal go/nogo type of
indication.
Do you actually need a display?
How about a LED or 3. My straw man
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