[time-nuts] Observations and opinions needed on graph by new nut
Paul A. Cianciolo
paulc at snet.net
Wed Aug 3 20:55:26 EDT 2011
See comments below
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of paul swed
Sent: Wednesday, August 03, 2011 6:31 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Observations and opinions needed on graph by new
Have not thought this through very well.
But it is what time-nuts is about.Assuming your 3801 is locked and checked
as Bob suggests. It puts out a 10 mc signal. At least mine does. Well if you
stuck that into the oscillators output instead of the VCO. Guess what? You
sort of just have propagation and modulation errors left from your
That's what I thought that I would see by doing this experiment, the
propagation and modulation effects. I figured the oscillator might drift a
little but the main artifact would be prop and mod.
Maybe it is? Right now there is a graph building for 24 hours of just the
output of the Spectracom 8165, no antenna connected.
The result for the past 4 hours has been a smooth consistent saw tooth as
shown in the last part of my earlier graph.
Is the EFC the only way that a disciplined oscillator get controlled? With
your idea would not allow the WWVB signal to "modulate" the GPS oscillator.
I wonder if monitoring the correction voltage going to the 8165's OCXO would
be worth looking at.
That might show something.
There are provisions for an RS232 connection on the back of the 8165, that
needs to be looked into.
Or at least mostly that. Its reasonably easy for you to try and would be
great to see your graphs after you did that.
Also run longer then a day I seem to have seen interesting stability on a 1
week time scale. Sections of the chart that matched other days offsets.
On Wed, Aug 3, 2011 at 5:54 PM, Bob Camp <lists at rtty.us> wrote:
> What is the Z3801 saying it's doing if you hook it up to a computer?
> There are several programs out there that will give you a pretty good
> idea of what's going on inside the beast.
> On Aug 3, 2011, at 1:05 PM, Paul A. Cianciolo wrote:
> > Hello Folks,
> > New nut here.
> > I have posted a graph here.
> > First time doing this sort of thing.
> > There is a comparison made between a z3801 GPS 10 MHz and a WWVB
> > locked
> > MHz
> > Could someone please look at it and validate my assumptions?
> > Being new to this I would like to make sure I am not going off on a
> > false path.
> > Thank you
> > PauLC
> > W1VLF
> > Paul A. Cianciolo
> > W1VLF
> > http://www.rescueelectronics.com/
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> > wind power.
> > Converting Photons to Electrons for over 20 years
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