[time-nuts] GPSDO - internal connections question

paul swed paulswedb at gmail.com
Fri Sep 23 13:07:42 UTC 2011

Well one point to add to all this.
Some time-nuts are hams, some are not.
You comment "Used in hamshack" suggests you are a ham.
RF interference from your radios will be a problem.
It can modulate the EFC and upset things. Granted it will normal up after a
So do consider a metal box and do use shielded cables. Ground only one end
of shield.
Might want to consider beads on the rs 232 lines etc.
Simply use good amateur radio design/construction techniques.
By the way I have a VE2ZAZ system works quite well and for Amateur use is

On Thu, Sep 22, 2011 at 5:25 AM, Attila Kinali <attila at kinali.ch> wrote:

> On Wed, 21 Sep 2011 18:36:43 -0500
> Chris Howard <chris at elfpen.com> wrote:
> > Thanks!
> > Would it do any good to have the control board, GPS, or anything else
> > within
> > its own shielded box?
> I'd put everything into one big metal box, but seperate the different
> submodules, probably shield them from each other.
> Please remember, that you are doing analog design on the EFC/OCXO side.
> This means that you have to have low noise levels where you handle these
> signals. This in turn means that you want to keep all digital electronics
> as far away from it as possible.
> Also think about a proper grounding scheme, as you connect the various
> submodules together, otherwise ground loops will introduce additional,
> hard to contain (and quite potent) noise.
>                        Attila Kinali
> --
> WYSIWYG is not a solution, it is the problem, and until we get around to
> realizing that very few of us are competent to design fonts, styles, or
> layout (14-year-old girls who dot their i's with hearts excepted, of
> course,
> the exception that nails down the lid on the coffin), we're going to have
> to
> live with that crap.
>                -- Stephen J. Turnbull in a discussion about word processors
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