[time-nuts] Shera Controller - U7

[Azelio Boriani]

Yes, that was my intention: I posted the VHDL of the TimeToDigital TIC I
use. Next will be the PI controller. I hope this short roadmap will lead to
the evolution of the Shera controller.

On Mon, May 14, 2012 at 4:37 AM, J. L. Trantham <jltran at att.net> wrote:

> I have always been interested in trying to improve the look of the 'dead
> bug' style.
>
> How about a small PCB with an 8 pin DIP connector that is used to mount the
> oscillator, the divide by 4 and get power, ground and provide 24 MHz and 6
> MHz outputs to the 8 pin DIP.  That way, the 'little module' plugs into the
> original socket on the PCB.  In addition, if the correct part ever becomes
> available, it's just 'unplug and play'.
>
> Lot's more effort but it sure would look good.  Might also allow for some
> modifications to raise the 24 MHz and achieve smaller phase increment
> corrections.
>
> Likewise, a module could be built to plug into U2 to provide for a 10 MHz
> VCXO and with jumpers for whatever frequency VCXO you might choose.  As
> designed, the controller is good to 5 MHz or so.
>
> Come to think about it, is it time to think about a 21'st century Shera
> Controller re-design?  Or has the TBolt made that obsolete?
>
> Joe
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of shalimr9 at gmail.com
> Sent: Sunday, May 13, 2012 9:08 PM
> To: kevin.staley at virgin.net; Time-Nuts
> Subject: Re: [time-nuts] Shera Controller - U7
>
> A 74AC74 in SO-14 package mounted dead bug style will make a handy /4 that
> is no bigger than most crystal oscillators.
>
> If that's still too big, you can go with the TSSOP, but no coffee for you
> for a week prior to soldering that baby :)
>
> Didier KO4BB
>
> Sent from my BlackBerry Wireless thingy while I do other things...
>
> -----Original Message-----
> From: "Kevin Staley" <kevin.staley at virgin.net>
> Sender: time-nuts-bounces at febo.com
> Date: Sun, 13 May 2012 17:27:20
> To: 'Discussion of precise time and frequency
> measurement'<time-nuts at febo.com>
> Reply-To: kevin.staley at virgin.net,
>        Discussion of precise time and frequency measurement
>        <time-nuts at febo.com>
> Subject: Re: [time-nuts] Shera Controller - U7
>
> Hi all
> Thanks for the many responses.
> It would seem that U7 is pretty rare.
> I think I will be going with a 24 MHz "Can oscillator" and a separate 6MHz
> source for the PIC either divided from the 24MHz oscillator or a separate
> oscillator.
>
> Thanks again
> Kevin
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Chris Albertson
> Sent: 13 May 2012 16:47
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Shera Controller - U7
>
> On Sun, May 13, 2012 at 8:11 AM, J. L. Trantham <jltran at att.net> wrote:
> > It is an 8 pin DIP, 24 MHz oscillator with an onboard divide output in
> > order to provide a dual output oscillator.  It is an ECS-300CX-240 and
> > DigiKey lists it as obsolete since 2009.  They say 'call'.
>
> Sounds like a you could use a normal 24MHz TTL can oscillator and a dual
> flip flop mounted "dead bug" style.
>
> Chris Albertson
> Redondo Beach, California
>
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