Hi All,
Considering this old stuff was that good, what's the best that's
currently available now? How does that compare to the best that's ever been?
Dan
On 10/3/2014 7:19 AM, time-nuts-requ...@febo.com wrote:
Tom,
Nice performance. Wish we could get that today! My fairly modern BVA is
The best now is the 8607 BVA OCXO from Oscilloquartz (now part of ADVA
optical networking).
On Fri, Oct 3, 2014 at 2:33 PM, Dan Kemppainen d...@irtelemetrics.com wrote:
Hi All,
Considering this old stuff was that good, what's the best that's
currently available now? How does that compare to
On 10/02/2014 06:03 AM, Richard (Rick) Karlquist wrote:
On 10/1/2014 1:04 PM, Hal Murray wrote:
drkir...@kirkbymicrowave.co.uk said:
Anyway, later today (tomorrow ??) I will post a plot of frequency vs
time.
The question is though, how long is thing thing likely to take too cool?
I'd
The most extreme example of slow ovenized oscillator warm-up I've seen is the
vintage hp106. These mid-1960's oscillators were designed as the ultimate, hp
way, pre-atomic, frequency standard -- expected to be powered up,
uninterrupted, for years and decades. So there was no hurry in the
Tom,
Nice performance. Wish we could get that today! My fairly modern BVA is nowhere
near that stability.
If you open up a brand new DOCXO you will see a crystal designed in the 70's
and an oscillator circuit designed sometime in the 30's or 40's, maybe updated
to a more or less modern
Len Cutler was pretty much allowed to do whatever he wanted
on the HP106 and he produced the proverbial doomsday machine.
I think the SR-71 analogy is good here, except that Kelly
Johnson had a lot more support from his management. Len always wanted
to make an optically pumped cesium as his
Hi
That 106 comes up *fast*. Take a look at the GR equivalent if you want to see
slow…..
Bob
On Oct 2, 2014, at 2:58 PM, Tom Van Baak t...@leapsecond.com wrote:
The most extreme example of slow ovenized oscillator warm-up I've seen is the
vintage hp106. These mid-1960's oscillators were
Following on from my question the other day about the type of
oscillator in the HP 8720D VNA, I finally got around to setting this
up on the spectrum analyzer today. Luckily, some software I wrote back
in 2008 for a friends HP 7 system was easy to modify to grab the
save the frequency. So I
Typical 10811 warm-up time is circa 10 minutes; cool-down time is actually
several times longer (since there is no active cool-downer in the case!)
More modern, smaller OCXO's will warm up and cool down more quickly.
If it's a double oven or user has added extra insulation around the basic
OCXO,
drkir...@kirkbymicrowave.co.uk said:
Anyway, later today (tomorrow ??) I will post a plot of frequency vs time.
The question is though, how long is thing thing likely to take too cool?
I'd expect an exponential decay so you need to specify how close to ambient
you want to get. I'd guess a
On 10/1/2014 1:04 PM, Hal Murray wrote:
drkir...@kirkbymicrowave.co.uk said:
Anyway, later today (tomorrow ??) I will post a plot of frequency vs time.
The question is though, how long is thing thing likely to take too cool?
I'd expect an exponential decay so you need to specify how close to
I'd expect an exponential decay so you need to specify how close to ambient
you want to get. I'd guess a ballpark of 10x the warm up rate.
You can probably measure it if you have the warmup graph. Turn it off, wait
a while, turn it on, measure the freq, consult warmup graph.
Some older
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