[time-nuts] Thermal effects on cables --> ADEV

Bob Camp kb8tq at n1k.org
Fri Jan 13 11:04:23 EST 2017


Hi

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 “systematic 
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. 

Bob


> On Jan 13, 2017, at 1:52 AM, Ole Petter Ronningen <opronningen at gmail.com> wrote:
> 
> 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_PresentationWSchaefer.pdf
> 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 gives
> 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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