Dear CA,
In my document describe my Frequency and Time standard you can find some info
about the difference and limit of the two solution.
GPSDO and Rubidium frequency standard can be alternative or complementary,
depends on your goals.
see:
http://www.timeok.it/wp/wp-content/uploads/2015/09/T
Merhaba Can,
On Thu, 17 Sep 2015 03:00:47 +0300
Can Altineller wrote:
> I have found out the RTC's differ by 1-2microseconds each second, on of
> them was falling behind 1microseconds each second, relative to other one.
That would mean they are within 2ppm of eachother, which sounds reasonable.
> Le 17 sept. 2015 à 02:00, Can Altineller a écrit :
>
> Hello,
>
> I started putting a test setup together when I suspected the DS3231 RTC's I
> got from dx.com were fake. So I put 2 mcus, each measuring microseconds
> from each 1PPS output with an interrupt, for the unit itself, and another
>
On Thu, Sep 17, 2015 at 2:00 AM, Can Altineller wrote:
> Hello,
>
> I started putting a test setup together when I suspected the DS3231 RTC's I
> got from dx.com were fake. So I put 2 mcus, each measuring microseconds
> from each 1PPS output with an interrupt, for the unit itself, and another
> in
Wow, you're all over the place here :-)
The "1-2 microsecond drift every second" you observe for the two RTC's
relative to each other, is entirely consistent with the few ppm spec for
that device. If you start tweaking the trim frequency you should be able to
get it trimmed to better than a ppm at
-- Forwarded message --
From: Pete Williams
Date: Thu, Sep 17, 2015 at 3:24 PM
Subject: F S manual
To: time-nuts@febo.com
Manual to quit... HP Cesium Beam Frequency Standard 5061A.
Original and in G C.
Applies to S/N prefix 1428A and has appendix with changes.
Options
A friend of mine is the clock chip guru at one of the major semiconductor
manufacturers. He said that the jitter in clock chip oscillators is rather
horrendous. Getting an oscillator to reliably start and run smoothly on
nanowatts of power is the major design issue for clock chips. Jitter t
Hello fellow time nuts. I started a long journey to deal with the wwvb BPSK
signal over 3 years ago. Since then I have released reactive solutions that
have been shared. Generally in the form of costas loops for phase tracking
receivers like the Fluke 207 etc and then the remodulator for the
timecl
Hello All,
Thank you for your illustrious answers. I suspected that the RTC's were
fake when someone alerted me on a forum, 43oh, when I was trying to make
them work with energia, and a TI microcontroller. A forum member stated:
"What does have me curious, is how cheap that is--since the DS3231 c
