Does your Mode B 10811 use a different xtral or same xtral, different
frequency?
What does Mode B do better, ... and worse?
Why was it not used in the 10811?
When trouble shooting a freq stability problem, usually the more data the
better.
What can really help to narrow down the cause or see
WarrenS wrote:
Does your Mode B 10811 use a different xtral or same xtral, different
frequency?
What does Mode B do better, ... and worse?
Why was it not used in the 10811?
Mode B is the same crystal on a different frequency
(about 10.95 MHz). It does not have a turnover and
the tempco is
On 23/09/11 05:40, Richard (Rick) Karlquist wrote:
On 9/22/2011 5:17 PM, ws at Yahoo wrote:
Within minutes the frequency changed more than the spec
For humidity to get thru something like that it takes weeks or more it
does it at all.
That fast of reaction, Sure sounds like some other effect
I have made plots of the effects of everything I can find that effects the
freq of a HP10811.
Most things are much slower than minutes, more like an hour time constant,
such as anything effecting the outside case's temperature
OR the effect is much faster than minutes, things such as voltage
WarrenS wrote:
I have to wonder if the unit being tested had its high impedance oven
control points lifted off the PCB board and on Teflon standoffs like the
production units?
ws
It was a production unit, no modifications whatsoever.
The oven change is an interesting theory; I never
Magnus Danielson wrote:
On 23/09/11 05:40, Richard (Rick) Karlquist wrote:
Blowing on the case? Did you consider the increased cooling that higher
humidity provides?
Cheers,
Magnus
Against, the frequency change we saw was considerably more
than what we got from changing the temperature
Maybe you have a bad joint in the tuning circuit and the humidity makes
the actual tuning voltage vary.
-John
===
Magnus Danielson wrote:
On 23/09/11 05:40, Richard (Rick) Karlquist wrote:
Blowing on the case? Did you consider the increased cooling that higher
humidity
On 23/09/11 23:25, Rick Karlquist wrote:
Magnus Danielson wrote:
On 23/09/11 05:40, Richard (Rick) Karlquist wrote:
Blowing on the case? Did you consider the increased cooling that higher
humidity provides?
Cheers,
Magnus
Against, the frequency change we saw was considerably more
than
Esteemed Colleagues,
I will attempt to make a coherent technical reply to the remarks made about my
10811 posting.
But first a bit of qualification. My remarks refer to the 10811 and that
vintage of OCXO’s.
Wrote: Doing what you describe will result in a very sensitive humidity sensor,
Perry Sandeen wrote:
Wrote: Doing what you describe will result in a very sensitive humidity
sensor, having eliminated the thermometer effect.
I do not understand. I believed that since the OCXO temperature will be
substationally higher than the surrounding temps, any residual moisture
You had a leak. If epoxy was really as bad as you indicate,
it would not be usable for holding pressure, or mild vacuum,
and yet it is. Somehow, someway you left a big hole in the
bucket.
-Chuck Harris
Rick Karlquist wrote:
Perry Sandeen wrote:
Wrote: Doing what you describe will result in
A problem I've seen when using the hermetic sealed soldered version of the
10811 from a dual oven unit,
is when the case is sealed the osc makes a good barometer because of changes
in its case due to barometric changes.
A 1 inch difference (such as 30 to 29) caused something on the order of
Within minutes the frequency changed more than the spec
For humidity to get thru something like that it takes weeks or more it does
it at all.
That fast of reaction, Sure sounds like some other effect like blowing a
little air on the case or loading the osc output with water in the output
Humidity is a confusing subject to many engineers and scientists.
Unlike most parameters it is a quantity with two input variables,
concentration and temperature. There are many ways to combine
these to give different units.
As a research scientist I spent most of my career working with
composite
On 9/22/2011 5:17 PM, ws at Yahoo wrote:
Within minutes the frequency changed more than the spec
For humidity to get thru something like that it takes weeks or more it
does it at all.
That fast of reaction, Sure sounds like some other effect like blowing a
little air on the case or loading the
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