This morning I waited for the VLF timing signals to settle
into their steady daytime phase - still showing the slow
cycle of phase variation.
Then I power-cycled the GPS, leaving everything else running.
During the 25 seconds it takes the GPS to begin sending PPS
again, my software continues to
Thanks for all the responses.
I've also had a response from uBlox support informing me that the
TimePulse accuracy will degrade (both due to motion and of course due to
multipath, weak signals etc. - datasheet accuracy figures are for
reasonable/optimal conditions). The uBlox module has a T
Is this a timing GPS receiver, or a generic fast start navigation receiver? 25
seconds to start from power on sounds rather short for a timing receiver.
The T-bolt start up from cold takes about 15 minutes for the crystal oven to
warm, then the self survey is run which by default is 2000
David Partridge wrote:
Is this a timing GPS receiver, or a generic fast start
navigation receiver?
Just an ordinary nav GPS, Garmin model GPS16HVS intended
I think for marine/vehicle applications. Spec says cold
boot 45 seconds, warm boot (position unchanged) 38 seconds.
Measured warm boot is
Hi
For the $50 to $100 cost it's tough to beat a Thunderbolt. It's overkill for
the application, but easy to find.
Bob
On Jul 2, 2010, at 6:45 AM, Paul Nicholson wrote:
David Partridge wrote:
Is this a timing GPS receiver, or a generic fast start
navigation receiver?
Just an
The GPS16 is not a timing grade GPS and only claims 1uS on the 1PPS.
Given this, I think 0.5uS jitter and +/- 1.4uS wander is not bad.
cheers,
ian
http://www8.garmin.com/products/gps16/spec.html
Message: 1
Date: Thu, 01 Jul 2010 10:15:16 +
From: Paul Nicholson vlf0...@abelian.org
I see some $20 programmers on the auction site. Goggle turns up many designs
with the warning that your PC serial port needs 11 to 12 volts. Did see a
design
that used a external power supply. A zif socket maybe over kill if you are only
using it once.
Any volunteers to supply
Whats your board count so far??
Better ?
How many16f688s are we talking here?
Thanks
On Fri, Jul 2, 2010 at 10:55 AM, Stanley Reynolds
stanley_reyno...@yahoo.com wrote:
I see some $20 programmers on the auction site. Goggle turns up many
designs
with the warning that your PC serial port
I'm not too excited about all of the individualshipping, but if you can tell me
how many you want, I could buy them, program them, and ship them to you to be
distributed with the boards.
-Chuck Harris
Stanley Reynolds wrote:
I see some $20 programmers on the auction site. Goggle turns up many
- Original Message
From: paul swed paulsw...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri, July 2, 2010 10:27:26 AM
Subject: Re: [time-nuts] Pic programing for the PICTIC II
Whats your board count so far??
23 people my guess is
Thank you but I have all I want to do with the boards later I may change my
mind.
Stanley
- Original Message
From: Chuck Harris cfhar...@erols.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri, July 2, 2010 10:30:25 AM
Subject: Re: [time-nuts]
Ok. I think there are a few of us who can/would program these up for
folks who need one.
On Fri, Jul 2, 2010 at 11:43 AM, Stanley Reynolds
stanley_reyno...@yahoo.com wrote:
Thank you but I have all I want to do with the boards later I may change my
mind.
Stanley
- Original Message
Oops, I didn't know this was on the list been getting a lot of off list stuff.
Some of my own emails to the list get lost before they get to me, others are
delayed this is a on going problem probably a yahoo spam filter overload.
UPDATE on order:
I have placed the order for more boards than
yes thats what I was thinking it depends on how many but I can program
I do not want to get tangled in shipping and all of that.
On Fri, Jul 2, 2010 at 11:45 AM, Bob Bownes bow...@gmail.com wrote:
Ok. I think there are a few of us who can/would program these up for
folks who need one.
On
Stanley,
I also want one board. I would like also a group buy of all parts, but I
recognize that it is a lot of work to do for the person taking charge of
it..
I can program the PICs for anyone in EU who needs it. But I think it is
better to offer a very simple programmer schematic that can
On 2 July 2010 16:37, Stanley Reynolds stanley_reyno...@yahoo.com wrote:
Better ?
How many16f688s are we talking here?
My thinking is less than 10 as only two people have asked.
Don't know how many have not asked.
Thanks
snip
___
time-nuts
Apologies for the previous incomplete message - somehow my laptop
trackpad jumped the cursor over the send button :-(
Better ?
How many16f688s are we talking here?
My thinking is less than 10 as only two people have asked.
Don't know how many have not asked.
I would also like a
All this talk about the PICTIC has aroused my curiosity ...
I missed the beginning of the thread, what is it for ?
I may want on the wagon too !!
73, Dick, W1KSZ
-Original Message-
From: Stanley Reynolds stanley_reyno...@yahoo.com
Sent: Jul 2, 2010 9:46 AM
To: Discussion of precise
Best source of info is :
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic
A simple time interval counter to connect at a PC serial port.
Sort of a experimenter's way to understand how the instrument works without too
much complexity.
Stanley
- Original Message
Folks,
I put together a mouser 'project' with all of the parts. This means
you can just go to the mouser site and order all the parts for the
project. No need for anyone to do a group buy of parts, re-pack and
re-distribute them. Here's how to get to it:
To access the project, click on the url
Hi
It looks like it may be a while before the trim pots come in (12 weeks...).
The 3266X (side adjust rather than top adjust) is in stock. I'm not sure if
the layout is side adjust friendly or not.
Bob
-Original Message-
From: time-nuts-boun...@febo.com
Changed it to a different part that is available. Difference is RHoS
compliance method.
Changed the backordered 2n3906 as well. Shaved $0.02 off the total cost!
Bob
On Fri, Jul 2, 2010 at 3:17 PM, Bob Camp li...@rtty.us wrote:
Hi
It looks like it may be a while before the trim pots come in
Looking at Richard's code in PICTICII.ASM :
bsf TXSTA,BRGH ;set USART hi speed mode
movlw D'51' ;set async rate at 9600 baud (51. for 8
MHz int, BRGH=1)
movwf SPBRG
Then '25' would be 19,200 baud
and '12' would be 38,400 baud
Need to test this
Hi
I believe he's using the internal clock on the PIC. It's not super accurate,
so running a lot of data can be an issue.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Stanley Reynolds
Sent: Friday, July 02, 2010 3:41 PM
To:
yes, internal clock, may need to tune the osc or try +- one number, external
osc
pins are in use.
Stanley
- Original Message
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri, July 2, 2010 4:11:11 PM
Subject: Re:
Time-Nuts,
Thanks for your interest in checking out the PICTIC II and working
together to simplify ordering the boards and parts. My hope is by
making the code available others will find ways to improve on the
basic design and will share their modifications to make this a
better project. As
Hi
Yup, and as you go to higher baud rates the +/- one makes for a bigger hop in
the baud rate.
One cute way to attack the problem:
Set the baud rate so it *should* be fast
Set the PIC transmitter to send two stop bits (or marking parity and two stop
bits if you can).
Set the PC receiver
Bob,
Another option with the 16F688 is to tweak the internal oscillator
rate slightly to give the proper baud rate. The code includes the
following two lines (normally commented out) to do this.
; movlw 0x00;put the cal value in OSCTUNE
; movwf OSCTUNE ;to calibrate
I requested 4 boards and I will need 4 of the 16F688's. However, one of my
goals for this is to learn to do the programming. Therefore, getting some
'pre-programmed' chips to compare with my own programmed chips will be very
helpful.
Joe
-Original Message-
From:
Joe,
Will add you to my list for boards, perhaps someone else here can help with
the
PIC chips.
Stanley
- Original Message
From: J. L. Trantham jlt...@att.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Fri, July 2, 2010 6:33:56 PM
Subject: Re:
Stanley,
I had sent you an email off list requesting the 4 boards. First was for 2
than an update changing it to 4. Didn't want to get a 'double order'.
I can easily order the parts via Mouser. The 'link' to the project looks
good. However, I anticipate the need for some help with the
Hi
The gotcha with the tune register is that it's not much help for those without
a PIC programmer...
Bob
On Jul 2, 2010, at 8:15 PM, Richard H McCorkle wrote:
Bob,
Another option with the 16F688 is to tweak the internal oscillator
rate slightly to give the proper baud rate. The code
The PIC's internal silicon clock is better than 1% over the entire industrial
voltage and temperature range. They are accurate enough.
-Chuck Harris
Bob Camp wrote:
Hi
I believe he's using the internal clock on the PIC. It's not super accurate,
so running a lot of data can be an issue.
Bob
Hi
A lot depends on just what you worry about. Most clock specs for serial com are
in the 0.01 to 0.1% range.
Bob
On Jul 2, 2010, at 9:02 PM, Chuck Harris wrote:
The PIC's internal silicon clock is better than 1% over the entire industrial
voltage and temperature range. They are accurate
Bob,
I have posted a code revision on the WIKI that provides serial commands
for modifying the OSCTUNE and SPBRG registers for those that might want
to adjust the baud rate and internal oscillator timing and don't have
facilities for programming the PIC. These commands won't alter the
default
Group Members,
Beginning in the days of the 1200 bps DPSK modem, clock crystals were
specified to .01% to allow the demodulator at the receiving end to
recover the clock in the data-stream and lock to it. The asynchronous
serial port attached to the modem needed to be no more accurate than
Add me to the list.
Thanks
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and follow the instructions there.
Add me to the list please.
Thanks
73s
Randall
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and follow the instructions there.
Hi,
I only worry about the UART working with other UARTS. And at the 1% spec,
the PIC UARTs , in my experience, always do
If you are concerned, use 2 stop bits.
-Chuck Harris
Bob Camp wrote:
Hi
A lot depends on just what you worry about. Most clock specs for serial com are
in the 0.01
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