Schomandl -- the company which made the first indirect synthesizers in
the sixties in the past century -- used buried crystal oscillators as
standard frequency source, 12meter deep in the companies yard in the
Belfort Strasse in Munich, Bavaria Germany, ...Rohde& Schwarz also had
buried oscillators. I have one in California, where, the temperature at
10m deep is 15,784C° around the year, and measuring the frequency off
set between wwvb's harmonic and the buried oscillator originally tuned
to cca 3MHz, to the natural serial resonance of the crystal, by counting
the beat -- to a harmonic of wwvb, cca 4217Hz , 364 358 801 pulses per
day, as of Nov 2014, counter resets by wwvb daily, daily changes max ± 8
pulses, are to see, but a yearly decrement of 15 to 8 pulses per year,
less per year in the last time is observable the "system down there"is
running since 1991.
73
KJ6UHN
Alex
On 11/23/2014 8:46 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 23 Nov 2014 14:45, "Bob Camp" <[email protected]> wrote:
Hi
If you have a basement in your house / building
I do not.
—and —
it’s dry and reasonably draft free (no garage doors opening up from time
to time)
My lab is a room which is part of the garage! Just about everything is
against me with this method, BUT you do give me an idea...
You got me thinking about the possibility of actually mounting the TCXO
burried in the ground! The temperature of that is not going to change
very rapidly.
FWIW, I know a guy that did work as an air conditioning engineer,, but now
works for a company selling geothermal heating. He installs ground source
heat pumps for the geothermal energy. He says that they actually work
quite poorly in many cases. In a couple of years the temperature of the
ground falls as the heat is extracted faster than it replenishes. So the
efficiency falls off. I don't think that the TCXO would heat the ground
faster than it dissipates away.
Of course there would be some practical issues burying the TCXO, but those
would not be insurmountable ones. I have no idea what depth might be
needed.
My wife thinks thinks I am a nutcase - that would only confirm it to her!
Dave, G8WRB
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