[time-nuts] Temp/Humidity control systems?

Bob Camp kb8tq at n1k.org
Mon Oct 31 07:35:19 EDT 2016


A multi mode resonant cavity is probably the “easy” approach. Like the waveguide, it is 
pressure / temperature / humidity sensitive. The same “can I separate the 
effects” issue applies.

Any enclosed device will have issues with properly representing the humidity in the room. 
It’s fortunate that the control goal is 50%+/- 30%. Fancy monitors are not required ...


> On Oct 31, 2016, at 6:17 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> On 31 Oct 2016 06:07, "Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:
>> --------
>> In message <
> CANX10hCpa5sOzUkQe00c5hCm-ZrWKbLnSOjCoLJokdRioLSXtw at mail.gmail.com>, "Dr.
> David K
>> irkby (Kirkby Microwave Ltd)" writes:
>>> [...] so it might be a relatively cheap way to measure humidity.
>> 80m wave-guide is neither cheap, nor in most circumstances, practical :-)
> But you don't need 80 m of waveguide. 100 mm or so would be sufficient.
> I have not looked at any of the papers someone have a link to, but I would
> imagine one problem would be there's litter airflow in the waveguide,  so
> it would be very slow to respond.
> Dave
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