[time-nuts] PICTIC II

Joseph Gray jgray at zianet.com
Sun Jun 27 21:00:58 EDT 2010


Thanks for the PDF files.

Joe Gray
W5JG

On Sun, Jun 27, 2010 at 5:46 PM, Stanley Reynolds
<stanley_reynolds at yahoo.com> wrote:
> done
>
> www.n4iqt.com/picticii/circuit.jpg
>
> www.n4iqt.com/picticii/PICTICII.bmp
>
> both above as pdf
>
> www.n4iqt.com/picticii/circuit-pcb.pdf
>
> Stanley
>
>
>
> ----- Original Message ----
> From: Joseph Gray <jgray at zianet.com>
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Sent: Sun, June 27, 2010 6:01:28 PM
> Subject: Re: [time-nuts] PICTIC II
>
> As asked by another, please post a PDF of the schematic. I don't have
> any software installed that can read the files you posted.
>
> Joe Gray
> W5JG
>
> On Sun, Jun 27, 2010 at 3:54 PM, Magnus Danielson
> <magnus at rubidium.dyndns.org> wrote:
>> On 06/26/2010 09:11 AM, Richard H McCorkle wrote:
>>>
>>> Fellow Time-Nuts,
>>> When I first uploaded the Simple PICTIC interpolating time interval
>>> counter to the K04BB site in 12/08 and presented it to the group as
>>> a Christmas present my goal was to get amateurs building their own
>>> interpolating time interval counters for GPS monitoring and making
>>> improvements to my design. The interpolator in the PICTIC was
>>> “borrowed” from an early HP counter with minor modifications so I
>>> didn’t design it and had no personal attachment to it.
>>
>> Which counter? Just curious.
>>
>>>   Over the last 18 months I have developed a new diode switched
>>> interpolator based on the comments made on line and have thoroughly
>>> tested it. Some suggestions made improvements in the performance and
>>> some resulted in poorer performance. I incorporated those suggestions
>>> that made improvements, eliminated those that made things worse, and
>>> once I was satisfied I sent the revised interpolator design directly
>>> to Bruce off line. Based on comments and suggestions he returned
>>> during a long series of emails I incorporated additional changes in
>>> the code, front-end, and interpolator designs and tested those
>>> changes until I was satisfied with the performance and he had no
>>> further comments. I am finally satisfied with the new design and
>>> admit that by incorporating the majority of the suggestions made
>>> the new interpolator has significantly better linearity than the
>>> HP interpolator used in the PICTIC and it is now suitable for
>>> higher resolutions.
>>>   I was reluctant to post the PICTIC II in this forum, as I don’t
>>> want to get in another public discussion of its faults without any
>>> discussion of the merits of a $50 serial output interpolating TIC
>>> on a 3.8” x 2.5” thru-hole board designed for amateur construction.
>>> The K04BB WIKI PICTIC page was recently updated to include the
>>> PICTIC II code and ExpressPCB board layout and schematic files for
>>> those that might be interested.
>>>
>>> http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:pictic
>>>
>>> The PICTIC II incorporates the new interpolator, requires a delay
>>> between the inputs, and uses a low stability XO timebase with
>>> software peak detection for calibration with provision for an
>>> external timebase like the PICTIC to minimize size and cost.
>>
>> Sounds interesting. What is the ball-park figures? Resolution, jitter,
>> linearity?
>>
>> Cheers,
>> Magnus
>>
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>
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