[time-nuts] Re: Power and heat re: Heathkit WWV clock / where are the good oscillators?

[Adrian Godwin]

Fran Blanche goes through the regulator circuit in detail and shows it's
having to deal with too large a voltage drop.

https://www.youtube.com/watch?v=I3yxSz4aNbE&t=323s

In a later video she removes the switching regulator a previous owner has
fitted, because it's generating interference that stops the clock receiving
the time.

https://www.youtube.com/watch?v=CU3UaHxhnac&t=385s




On Mon, Aug 8, 2022 at 8:28 PM Brooke Clarke via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hi:
>
> I think it is simply that the voltage regulator is a linear type that
> dissipates the difference between it's input and
> output.  I don't see it as a problem.
> https://prc68.com/I/HeathkitGC1000.shtml
>
> --
> Have Fun,
>
> Brooke Clarke
> https://www.PRC68.com
> axioms:
> 1. The extent to which you can fix or improve something will be limited by
> how well you understand how it works.
> 2. Everybody, with no exceptions, holds false beliefs.
>
> -------- Original Message --------
> >> I've seen numerous reports of the flawed power supply and regulator,
> and the
> >> intense heat it generates in the chassis, and I'm stumped. Why does it
> need
> >> so much power that it's getting hot?
> > Wikipedia doesn't have a page on the Heathkit GC-1000, but it is
> mentioned on
> > their Radio clock page and says 1983.
> >    https://en.wikipedia.org/wiki/Radio_clock
> > and that has a link to:
> >
> https://www.pestingers.net/pages-images/heathkit/radio-equipment/gc1000/gc100
> > 0.htm
> > which has a set of pictures, one shows "13w max"
> >
> > 10 watts in a plastic box.  I'm not surprised it gets hot.
> >
> > Why does it need so much power?  You are comparing 40 year old
> technology with
> > with your expectations calibrated on modern technology.
> >
> > A couple of differences:
> >    CMOS technology
> >    LCD vs LED
> >    WWVB vs WWV
> >    Switching power supplies
> >
> > It would be fun to see a plot of the power needed to run a watch over the
> > years.
> >
> > Initial GPS receivers were $250K.  They came out about the same time.
> >
> >
> >
>
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