[time-nuts] Fwd: Fwd: PicTic Data

Sun Aug 15 14:53:28 UTC 2010

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 <wjriley at embarqmail.com>
Date: 16 August 2010 02:32
Subject: Re: Fwd: [time-nuts] PicTic Data
To: Steve Rooke <sar10538 at 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: bill at wriley.com
Web: www.wriley.com

--------------------------------------------------
From: "Steve Rooke" <sar10538 at gmail.com>
Sent: Sunday, August 15, 2010 8:39 AM
To: <bill at 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 <sar10538 at gmail.com>
> Date: 16 August 2010 00:05
> Subject: Re: [time-nuts] PicTic Data
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
>
>
> On 15 August 2010 17:01, Stanley Reynolds <stanley_reynolds at 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 <jmiles at pop.net>
>> To: Discussion of precise time and frequency measurement <time-nuts at 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 <jmiles at pop.net>
>>> To: Discussion of precise time and frequency measurement
>>> <time-nuts at 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-bounces at febo.com [mailto:time-nuts-bounces at 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
>>> >
>>> > _______________________________________________
>>> > time-nuts mailing list -- time-nuts at febo.com
>>> > To unsubscribe, go to
>>> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> > and follow the instructions there.
>>> >
>>>
>>>
>>> _______________________________________________
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>>
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>> and follow the instructions there.
>>
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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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-- 
Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.
- Einstein