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

[Brooke Clarke]

Hi Adrian:

On the first video you may notice my comment at the top. 13.8 VDC is what you expect to get when the external back up 12 
Volt battery is connected.  So a "fix" that lowers the voltage will not be correct when the backup battery is used.  
Also my comment on the second video is at the top.

-- 
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 --------
> 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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