Steve, I'm sure there are several folks here with web sites or download
areas that could host the files. If no one else raises their hand, I
could put them on febo.com.
John
----
Steve Rooke said the following on 08/15/2010 10:53 AM:
Stanley and Nigel,
I have received the go ahead to distribute the Small DMTD project
files from Bill. It is in the form of a 500k zip so how do we want to
play this? For a start, Gmail will not let me send .exe files, even
though they are inside a zip file and I'm not putting them into a
password encrypted file to circumvent this so I'll send the archive
with the extension changed to .xxx. If you don't know how to change
that back to .zip may I suggest you contact Mr Gates and tell him that
his method of file typing sucks and is a noddy system fit only for
Toytown.
Steve
---------- Forwarded message ----------
From: William Riley<wjri...@embarqmail.com>
Date: 16 August 2010 02:32
Subject: Re: Fwd: [time-nuts] PicTic Data
To: Steve Rooke<sar10...@gmail.com>
Steve:
You are welcome to freely distribute the Small DMTD files.
Best regards,
Bill
W.J. Riley
Hamilton Technical Services
650 Distant Island Drive
Beaufort, SC 29907-1580 USA
Phone: 843-525-6495
Fax: 843-525-0251
E-Mail: b...@wriley.com
Web: www.wriley.com
--------------------------------------------------
From: "Steve Rooke"<sar10...@gmail.com>
Sent: Sunday, August 15, 2010 8:39 AM
To:<b...@wriley.com>
Subject: Fwd: [time-nuts] PicTic Data
Hello Bill,
I have not started on the DMTD project yet as I'm still in the process
of building Richard's PICTIC II boards but Stanley Reynolds posted
about your DMTD expressing a desire to build them. As I have all the
info needed for this, I would be in a position to supply him and
anyone else with this data BUT this depends upon your willingness for
the distribution of your design to go beyond myself. If you are happy
for me to do this, I will, otherwise, i will refrain from doing this?
Best regards,
Steve
---------- Forwarded message ----------
From: Steve Rooke<sar10...@gmail.com>
Date: 16 August 2010 00:05
Subject: Re: [time-nuts] PicTic Data
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
On 15 August 2010 17:01, Stanley Reynolds<stanley_reyno...@yahoo.com> wrote:
Thanks for looking at my data that was what I was fishing for all along :-)
I was looking at the article:
"A Small Dual Mixer Time Difference (DMTD) Clock Measuring System W.J. Riley"
Richard posted
And thinking it would be nice to do the DSS and Mixer boards to go with the
pictic II.
I have been speaking to Bill Riley about doing this myself and he has
sent me all the board designs, software, etc. to enable one to be
built. I can ask him if he is OK if I distribute this if you wish.
Steve
Or changing the Pictic II to use the Acam TDC GP2 Time to Digital Converter; 2
channel w/65 ps resolution now under $30. as Bruce suggested a while back.
My wants sure exceed my cans ;-)
Stanley
----- Original Message ----
From: John Miles<jmi...@pop.net>
To: Discussion of precise time and frequency measurement<time-nuts@febo.com>
Sent: Sat, August 14, 2010 11:25:44 PM
Subject: Re: [time-nuts] PicTic Data
John glad you are getting good results and have something to
compare to. Back to
me who doesn't have any knowns but lots of guessing. Attached is
a run with a
box cover over the pictic, run is shorter ~ 800 seconds but the
box does look
like it helps.
I need to do a lot more testing but sometimes I just get excited :-)
I imported your .txt file alongside the traces I captured. Assuming it was
taken with 1 Hz on both START and STOP, it looks like the attached.
You're getting the exact sort of results that I see if I feed both the START
and STOP inputs at 1 Hz. My guess is that the onboard oscillator limits the
performance in that case, since it has a lot of time to drift during the
measurement if the two pulses occur close to 1 second apart. Even the 5370B
looks much worse if driven with 1 Hz on both inputs than it does with 1 Hz
at START and 10 MHz at STOP.
So I think you're basically up and running OK. When I get around to trying
a better clock, I'll also go back and see if the 1-pps x2 performance
improves.
It would be great if the next spin of the board could include sine-to-CMOS
shapers for the input channels as well as an external clock input, for
people who are working directly with RF signals as opposed to 1-pps.
-- john, KE5FX
----- Original Message ----
From: John Miles<jmi...@pop.net>
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Sent: Sat, August 14, 2010 10:19:46 PM
Subject: Re: [time-nuts] PicTic Data
A few preliminary measurements here (I'm working on getting some software
support together):
http://www.ke5fx.com/pictic.htm
-- john, KE5FX
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Stanley Reynolds
Sent: Saturday, August 14, 2010 7:12 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] PicTic Data
My guess as to what the data may indicate is performance of the
10 Mhz 20PPM
PICTIC internal oscillator, need to repeat test with precision
10Mhz and auto
calibrate off. Fatness of the line/width maybe PICTIC error. Note
graph seems to
show me leaving the room and returning via the outside door. Not
sure what the
~100 sec oscillations are, need to check a/c cycle time.
Stanley
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--
Steve Rooke - ZL3TUV& G8KVD
The only reason for time is so that everything doesn't happen at once.
- Einstein
--
Steve Rooke - ZL3TUV& G8KVD
The only reason for time is so that everything doesn't happen at once.
- Einstein
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