On 05/01/14 08:51, Peter Schmelcher wrote:
Chris,
This hi res pic might help you. I modified my Z3816A to improve the
performance. I changed the grounding and added a few extra capacitors.
This pic is close to the start so very few changes.
-Peter
Peter,
Thanks very much for sending that. The
Hi Chris
I've got some results to hand for three samples of the fluke.l
MTI-260-0624-C oscillator, if that's the one you mean?, and for 5 MHz output
they all
require an EFC input on pin 1 between 2.8 and 3.1 Volts.
That's with a 12 Volt supply on pin 5, which gives approx 6 Volts out on
Chris,
The Z3816 has a few design short comings. In the circuit board pic the MTI
oscillator circuit board grounding is improved. Subsequently I opened and
modified the oven internally and added an extra oven feedthrough pin. The
issue is the oven heater current modulates the ground pin
Fellow time-techies,
I'm on the prowl for a small panel-mount IRIG-B display, similar to the
Datum 9520 series (they made one for aircraft use, which just happens to
be the one I'm after).
The only critical things about it are:
--Needs to be able to run directly off a 12
Hi, I'm new here so please be gentle!
I'm considering designing and building some dataloggers, probably ARM
Cortex based (eg. STM32F4xx), which record the time of infrequent
events, preferably to better than 100ns and if possible better than
50nS. The data loggers will be continuously
tn...@toneh.demon.co.uk said:
Can anyone point to figures for a typical non-TXCO low cost oscillator, 10
or 16MHz?
In general, low cost oscillators make pretty good thermometers.
I think you have a much better chance of getting good results if you are
willing to post-process the data.
I
Welcome to the nuts Tony
You are not specifying exactly how accurate time has to be but in my book
and based on tests the most reasonable priced GPS with 1 pps is a Ublox 6M
that you can get with antenna for less than $ 22 antenna included from
_www.DX.com_ (http://www.DX.com) . They have
Welcome!
Take a look at NavSpark from SkyTraq (http://www.skytraq.com.tw/). They had
an Indiegogo
(https://www.indiegogo.com/projects/navspark-arduino-compatible-with-gps-gnss-receiver)
campaign recently and should deliver real soon now. The NavSpark chip has an
trigger pin for time capture, a
On 03/05/2014 00:48, Hal Murray wrote:
tn...@toneh.demon.co.uk said:
Can anyone point to figures for a typical non-TXCO low cost
oscillator, 10
or 16MHz?
In general, low cost oscillators make pretty good thermometers.
True, but it's short term stability that matters here - over 10s of
On 03/05/2014 00:59, ewkeh...@aol.com wrote:
Welcome to the nuts Tony
Thanks, Bert.
You are not specifying exactly how accurate time has to be but in my book
and based on tests the most reasonable priced GPS with 1 pps is a
Ublox 6M
that you can get with antenna for less than $ 22 antenna
The Neo-6M based module (Crius CN-06) is available from HobbyKing for $20
(sometimes on sale for $16). You do have to add the wire to access the 1PPS
signal.
In my testing, I prefer it over the Adafruit Ultimate GPS. The Neo-6M seemed
to a a little more sensitive (could get reliable lock
here is what I'd do
Get a decent OCXO (ovenized crystal oscillator and control it with your
GPS. Don't worry if the GPS's PPS is 50ns or 5ns. You are going to be
averaging these for a while.Basically you build a GPSDO.These have
become very easy to make. I have one I made for
tn...@toneh.demon.co.uk said:
In general, low cost oscillators make pretty good thermometers.
True, but it's short term stability that matters here - over 10s of seconds
the temperature shouldn't change much - especially if a bit of insulation
is used around the oscillator.
Ballpark is 1
-Original Message-
From: Tony
[]
I'm considering designing and building some dataloggers, probably ARM
Cortex based (eg. STM32F4xx), which record the time of infrequent
events, preferably to better than 100ns and if possible better than
50nS. The data loggers will be continuously
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