[time-nuts] Thermal effects on cables --> ADEV
scott.j.stobbe at gmail.com
Fri Jan 13 13:08:55 EST 2017
I think you might be overthinking their point, that if you plan to use an
xDEV as a measure for state of health, don't use years worth of data.
Otherwise it could be days before the xDEV visually changes.
On Fri, Jan 13, 2017 at 11:04 AM, Bob Camp <kb8tq at n1k.org> wrote:
> There’s an interesting comment buried down in that paper about limiting
> ADEV to
> < 300 samples per point. Their objective is apparently to better highlight
> errors”. I certainly agree that big datasets will swamp this sort of
> thing. I’m not quite
> sure that I’d recommend ADEV to find these things in the first place. My
> guess is that
> it’s the only spec they have to call the device good or bad in this case
> …They don’t seem
> to have Hadamard in their list of variances. If I was going after
> systematics with a deviation,
> that’s the one I’d use. Of course I probably would not use a something-dev
> in the first place.
> > On Jan 13, 2017, at 1:52 AM, Ole Petter Ronningen <opronningen at gmail.com>
> > Hi, all
> > The question of phase shifts in cables pops up every now and then on this
> > list - I stumbled across a good table of measured phase shifts with
> > temperature in different cable types in this paper:
> > http://www.ira.inaf.it/eratec/gothenburg/presentations/ERATEC_2014_
> > that I though would be of interest to others.
> > A quick summary given below, see pdf for full details. Lots of other
> > interesting stuff in there also.
> > Values in ppm/K, for 10 Mhz except when otherwise stated. (The paper
> > values for 5, 10 and 100Mhz)
> > Huber-Suhner Multiflex 141: -6
> > RG-223: -131.9
> > Semiflex Cable: -11.5
> > Huber-Suhner: -8.6
> > Times Microwave LMR-240: -3.4
> > Times Microwave SFT-205: 7.7
> > Meggitt 2T693 SiO2: 30.6
> > Andrew FSJ-1 (@5Mhz): 25
> > Andrew FSJ-4 (@5Mhz): 10
> > Andrew LDF-1P-50-42: 2.8
> > Andrew LDF4-50A: 4.7
> > Times Microwave TF4FLEX (@100Mhz):6.4
> > Phasetrack PT210 (@100Mhz): 2
> > Ole
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