Corby
Just a 1 cent thought that may not apply or be accurate.
C-fields are current sensitive, so if they are wound with copper wire, any
small change in their temperature, even when temperature controlled, could
have a effect much greater than 1PPM on that current when driven from a
fixed
on Wed, Jan 18, 2017 Chris wrote:
>But BEFORE you try and improve the Rb performance you need to have some way
>to MEASURE its performance. This is likely much harder.
Testing most RB's mid & long term performance can be done "on the cheap" by
using a Tbolt that's been set up to accept it
If you have a good antenna setup and a constant temperature environment:
The way to get the lowest noise over short time periods on a TBolt is to set
the TC setting as high as you can (typically 500 to 1000+), and set the
Damping factor as fast as you can (typically 0.7 to 1).
The reason is
A cold oven freq is off by hundred's by Hz, Much much greater than the range
of the Dac
The TBolt does not start tuning until it's oven has warmed up.
Setting anything in the Tbolt biased on cold start turn-on is counter
productive. It takes days or weeks for it settle down.
At initial turn-on
Bert
a) 1e-10 freq error, Sounds to me like you have a typical TBolt with near
factory default setting.
The most important thing to get good Tbolt frequency performance is the
antenna, with good sky view and correct location setting.
After that there are some 'basic' Tbolt setting and things
Tom
Impressive. Nice job.
How would one go about to prove beyond a doubt in that experiment that 18ns
of phase shift in 24 hrs was truly caused by freq offset due to Relativity
and not by some other combination of environment and handling issues that
effected phase &/or freq once the identical
Same here for me in central California near the coast(SLO county).
My Tbolt lost all satellites all at the same time, for 100 min @ ~5:30 PM
PST.
Then just as suddenly all came back on line, with no input from me.
A truly unique experience for this Tbolt which runs pretty much
continuously.
LH
.
But if you want nut performance, best not to use the same supply for them.
I start with a 15V supply, so that there is no interaction between circuits.
ws
*
From: Richard (Rick) Subject: Re: [time-nuts] HP 10811
On 2/11/2016 2:56 PM, ws at Yahoo via time-nuts wrote:
>
Joe
The inner oven voltage needs to be stable! To better than 0.1V.
Unlike the single oven unit, the inner oven on the dual oven unit runs fine
at 15 Volts. It draws a couple hundred ma after warm-up.
One thing that improves the performance of a dual oven 10811 when being used
in a standalone
John
If it is off very far the first thing I'd suspect is the inner oven.
Assuming the freq is still stable and low noise, one option is to rewire it,
and make the freq adjustment accessible.
Removing the original inner wiring wrap also provides many other advantages,
and no down side
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