: Thursday, September 24, 2015 3:58 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] algorithms and hardware for comparing clock
pulses
the role of the diode is just to have a voltage drop?
73
KJ6UHN
Alex
On 9/23/2015 11:31 PM, Bill Hawkins wrote:
> Perhaps I
[mailto:time-nuts-boun...@febo.com] On Behalf Of Bob
Camp
Sent: Thursday, September 24, 2015 6:37 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] algorithms and hardware for comparing clock
pulses
Hi
Simple approach:
Use a pair of tri-state buffers.
Both
Perhaps I can do this in words, as I have no schematic software.
Start with the input to your favorite microprocessor's A/D converter.
Connect it to a suitable (more later) capacitor to analog ground.
Connect a cmos switch across the cap and call it S2. When S2 is on, it
discharges the cap.
Now
Hi
Simple approach:
Use a pair of tri-state buffers.
Both have their outputs hooked to the cap through resistors.
One (call it A) has its signal input grounded. The other (call it B) has
its signal input tied high. Both of the tri-state controls normal sit in the
“off” (= output is
the role of the diode is just to have a voltage drop?
73
KJ6UHN
Alex
On 9/23/2015 11:31 PM, Bill Hawkins wrote:
Perhaps I can do this in words, as I have no schematic software.
Start with the input to your favorite microprocessor's A/D converter.
Connect it to a suitable (more later) capacitor
Group,
Seems to me that what's needed here is a current source for linear volts
vs. time and the cmos switching to control the duration of the capacitor
charge while the phase flip-flop is on. When it turns off, it interrupts
the processor and isolates the capacitor so it acts as a
Hello All,
Another night heroically wasted, and I have achieved a PID lock within 50 /
80 000 000 th of a second between two clocks. 50 is there because it is the
minimum clock ticks for the irq handler to execute.
To summarize:
1. I am using a TI launchpad running at 80mhz. I was using
Jim,
I had the intent to try this, but never got around doing it. Thanks for
reminding me. Please share any enhancements.
I did exchange some emails with Lars, but as that project never got off
the ground, it faded out.
Cheers,
Magnus
On 09/21/2015 10:02 PM, Jim Harman wrote:
Hi Can,
LaJeunesse
Sent: Monday, September 21, 2015 at 1:45 PM
From: "Can Altineller" <altinel...@gmail.com>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Subject: [time-nuts] algorithms and hardware for comparing clock pulses
Dear Time-
altinel...@gmail.com said:
>I finally found a way to measure 1pps output from my DS3231's, with a mcu
> unit, and modify the aging register on the RTC, I have been able to sync
> between 2-3 microseconds between clocks by substracting and adding 0.1ppm to
> 12.8ppm, with 7 bit resolution.
onday, September 21, 2015 at 1:45 PM
From: "Can Altineller" <altinel...@gmail.com>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com>
Subject: [time-nuts] algorithms and hardware for comparing clock pulses
Dear Time-nuts,
...
Dear Time-nuts,
I finally found a way to measure 1pps output from my DS3231's, with a
mcu unit, and modify the aging register on the RTC, I have been able to
sync between 2-3 microseconds between clocks by substracting and adding
0.1ppm to 12.8ppm, with 7 bit resolution.
Since the
better than 0.1
microseconds.
Bob LaJeunesse
> Sent: Monday, September 21, 2015 at 1:45 PM
> From: "Can Altineller" <altinel...@gmail.com>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts@febo.com>
> Subject: [time-nuts] alg
febo.com>
Subject: [time-nuts] algorithms and hardware for comparing clock pulses
Dear Time-nuts,
...
I probably need a hardware to measure the time pulses more precisely.
...
Are there any solutions to this problem?
...
Hi Can,
For a simple analog solution, you might try a 74HC4046 phase detector
followed by a diode and RC network as used in Lars Walenius' GPSDO,
described here in the archives:
https://www.febo.com/pipermail/time-nuts/2014-February/082820.html
The phase detector produces a pulse whose width
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