.
> > > Bill, NL7F
>
> --
> Larry Gadallah, lgadallah AT gmail DOT com
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ClockSync is a nice Android NTP app, which displays NTP time and system
time and can sync the system time to NTP if you have root access.
Phones may need to be rooted for this to work. The ClockSync FAQ has a good
explanation of these issues.
> --Jim Har
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lots of my system if it would help to clarify.
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. You can get an
indication of what is going on by looking at the DAC voltage, but you can't
tell for sure, which leads to Bob's comments that the only way to tell for
sure is to compare your GPSDO's frequency to a better reference.
HTH
--
--Jim Harman
mounting surface before
attaching the LPRO to an appropriate heat sink? After removing the pad, can
I use ordinary thermal grease between the LPRO and the heat sink?
Thanks for any advice.
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message -- I am glad to look at any
> and all possible designs.
> Happy time-keeping!
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> an
ut boards. I
have used them on a couple of occasions, most recently to get a few
TDC7200s for a GPSDO project (more on that later)
You order the breakout board and specify the Digi-Key part number, and a
few days later your assembled breakout board arrives.
https://www.proto-advantage.com/st
; Spring Branch, TX 78070
> br...@lloyd.aero
> +1.210.802-8FLY (1.210.802-8359)
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Here is the procedure I use to set up my GPSDO, which is based loosely on
Lars Walenius' excellent write-up on his system. To tune the filter you
need to have a Hold mode that opens the control loop and lets you set the
DAC value and a way to monitor the raw phase detector output minus its
nominal
C covers the full tuning range of the oscillator?
Thanks for any explanation you can provide.
>
--Jim Harman
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o unsubscribe, go to
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ot;outputs a 32.768kHz square-wave signal".
>
> Has anyone done this, or does it seem like it may be worthwhile?
>
> Thanks,
>
> Michael
>
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ly, it would catch on fire!
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; Obviously I'm trying to preserve the 100 MHz phase noise.
>
>
>
> Any advice would be appreciated.
>
>
>
> Best Regards
>
> Martyn
>
>
--Jim Harman
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n___
>
> Presumably one has to stop logging to access the logged data ?
>
> Cheers
>
> Arne
>
> --
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ht
ger which can collect and
> save ASCII data, not specifically for the FA2 (I tried it with a GPS
> receiver collecting NMEA).
> It works with a USB-Serial chip like the FTDI, Prolific, Silabs, it may
> even work with the CH340, via the USB connector of an Android phone or
> tablet
tem from
overheating.
My GPSDO dissipates about 3 watts and I have had good results by putting
the system in a small picnic cooler along with 3 one liter bottles of water
and some bubble-wrap to fill up the extra space.
--
--Jim Harman
___
ti
-DAC-has-no-ripple
which describes a sample and hold technique for reducing the output noise
of a PWM DAC. The article also has references to other PWM noise reducing
techniques.
--Jim Harman
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To
a high input resistance so 10K would probably
be better.
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cribe, go to
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With a multiplexed display you should be able to do it all with one
processor.
On Mon, Jul 22, 2019, 4:42 PM Jim Harman wrote:
> Correction: RMC has date also later in the sentence.
>
> On Mon, Jul 22, 2019, 4:38 PM Jim Harman wrote:
>
>> RMC is very common but gives time
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go to
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oise specs on
> the MCP4725,
> who knows if things are getting better or worse. I’d bet better …..
>
> That *is* a weird little package ….
>
> Bob
>
> --
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seems to be performing well.
> When I look at the Lars GPSDO what you have built doesn't quite seem to
> match. Such as using a real DAC. Is this one of the variants that can
> exist?
> Regards
> Paul
> WB8TSL
>
>
>
--
--Jim Harman
Arduino GPSDO Schematic v4.pd
to the
plastic box with a clear cover. In addition to being sturdier, it lets you
see the blinking LEDs. while it is operating.
Thanks again to Bert for his kind testing assistance.
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C/DC ammeter with a
reasonably sensitive range (40 A or less) is very handy. My current
favorite is the Mastech MS2108, from Amazon.
-Jim Harman
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value
every second and the phase detector has a lock-in range of 1 usec.
. <http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com>
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Tobias asked,
@Jim Harman
Indeed I know Lars' GPSDO. Can you tell what performance you achieved with
one of those?
It is hard for me to quantify the performance because I don't have anything
better to compare it to. The TIC resolution is 1 nsec.
I can say that it will stay phase locked to the 1
Also Nick Sayers's GPSDO described here
https://www.tindie.com/products/nsayer/gps-disciplined-ocxo/
is based on the same design and he has performance data.
On Tue, Mar 19, 2019 at 8:32 PM Jim Harman wrote:
> Tobias asked,
> @Jim Harman
> Indeed I know Lars' GPSDO. Can you
design and would be happy to answer any
questions you have.
>
> --
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);
Serial.println(adj);
}
}
---
On Thu, Mar 7, 2019 at 8:14 AM Jim Harman wrote:
> For ease of programming and reasonably low power consumption I would look
> into an Arduino.
>
>>
>>
--
tions for other than 22 +/- 1 degree C.
>
>
> These DS3231 modules are a complete clock
>
>
>
> --
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m is elsewhere?
>
> --
> Joe Leikhim
>
>
> Leikhim and Associates
>
> Communications Consultants
>
> Oviedo, Florida
>
> jleik...@leikhim.com
>
> 407-982-0446
>
> WWW.LEIKHIM.COM
>
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makes an excellent pickup for the "ticks" from any quartz clock or
> watch that I've ever met.
>
>
>
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&
Charles wrote,
>
> According to my tests, the B-C junction of a high-quality 2N3904 has
> about 50pA of leakage at 20vDC reverse voltage.
That's good to know, but the problem I had with this circuit was with the
forward current at a low forward voltage. With this phase detector, the
HC4046 makes
Magnus said,
It would be interesting to test the linearity of the TIC separately for
instance.
I have done some testing of the TIC. It works quite well for the Arduino
Uno with its 1 V full scale ADC setting, but the exponential shape of the
RC charging from the 5 V is quite evident if you use
> The challenge seems to me to be
how to temperature stabilize the entire DAC chain without putting it all in
an oven
Hi Forrest,
Generally you don't have to temperature stabilize the DAC because it is
inside the phase-locked control loop and the loop will adjust for
temperature dependencies,
Can listen with Grundig portable 7175 Fairfield CT
On Sat, Jul 7, 2018, 5:28 PM Dr. Ulrich L. Rohde via time-nuts <
time-nuts@lists.febo.com> wrote:
> No one in NJ or NY CITY ?
>
> Sent from my iPhone
>
> > On Jul 7, 2018, at 5:22 PM, Dr. Ulrich L. Rohde via time-nuts <
>
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