[time-nuts] Thermal effects on cables --> ADEV
kb8tq at n1k.org
Fri Jan 13 13:11:24 EST 2017
I do agree with their point that systematics will get buried in giant data blocks.
What I’m not quite as sure of is the utility of even 300 sample blocks to spot
> On Jan 13, 2017, at 1:08 PM, Scott Stobbe <scott.j.stobbe at gmail.com> wrote:
> 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:
>>> 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
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