Hi Richard,
Thanks a lot for the information, your email hit me at exactly the same
time as the one telling me I won a HP 5316B time interval counter on
eBay :-)
(Could not find a 5370 I could afford...) (I have waay too many counters
right now, but only one with TIM _and_ GPIB...)
Thanks a l
I wanted to get the Simple Commands decoder into the public domain and decided
TIC232 was a good way to show off changing a single variable by serial port
command as a minimum implementation. I thought the time-nuts might get a kick
out of the TIC as it is so simple a solution and yet highly acc
> Is the USB bus really a good way to get 1 PPS into a machine? I would
> think it would have quite a bit of jitter in it.
I'm not a USB wizard, but I work with people who are.
There is no interrupt mechanism on a USB cable. The host/master polls the
devices/slaves. Typical numbers are 10 ms
I missed a character, OOPS! Here is the corrected link. Sorry about that!
- Original Message -
From: "Richard H McCorkle" <[EMAIL PROTECTED]>
To: "Discussion of precise time and frequency measurement"
Sent: Friday, August 11, 2006 10:51 AM
Subject: Re: [time-nuts] How do I know my GPS st
Brooke,
While there may be some variations in how manufacturers code their TRAIM
algorithms, I have attached an OLD (1998!) Motorola Doc concerning their
TRAIM. Basically, you can tell the receiver how to handle TRAIM errors.
You can tell the receiver to keep outputting the 1PPS and flag it as
sus
A very low cost way to test your GPSDO is to generate 1Hz from the GPSDO
with the TVB divider compare it to the GPS 1PPS with the Simple Time
Interval Counter with RS-232
Output(http://www.piclist.com/tehref/member/RHM-SSS-SC4/TIC232.htm), log the
difference readings over time on a computer, and fe
In a message dated 8/11/2006 09:57:18 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
Hi Glenn, Didier,
if you plan to use an RTOS with it (many are freely available for these
chips) which really helps with house-keeping for timing applications, then I
highly recommend the Arm JTAG deb
Hi Randy:
Would you elaborate on how TRAIM works. I thought that it acted like a
switch and either allowed the 1 PPS output or turned it off.
But you seem to be saying that it can remove a bad satellite from the
solution and maintain the 1 PPS output. Is that the case?
Have Fun,
Brooke Clark
Glenn,
You're right. I would expect quite a bit of jitter. My comment about
USB-Serial converters probably should not be on a "timing" news list.
However, the 1PPS coming in on the DCD line of a standard serial port
jitters too, but is still plenty accurate for "loose" timing systems
like NTP serv
Is the USB bus really a good way to get 1 PPS into a machine? I would
think it
would have quite a bit of jitter in it.
-glenn
Randy Warner wrote:
>Didier,
>
>I too have looked at the SiLabs parts. I may just have to get one of
>their eval boards.
>
>I use the SiLabs CP2102 USB-to-Serial convert
Didier Juges wrote:
>Hi Said,
>
>Thanks for the info, I did check the Philips (and Sparkfun) web site(s)
>and I must admit the ARM chip is cheap and has impressive
>specifications. With the GNU tools, I know it will work and it will fit
>my homebrewer's budget :-) I used to consider $99 for a d
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