[time-nuts] Comparing PPS from 2 GPS units
Hal Murray
hmurray at megapathdsl.net
Tue Dec 18 05:40:33 UTC 2012
jimlux at earthlink.net said:
> You mean RG65 http://www.awcwire.com/ProductSpec.aspx?id=M17/
> 34-RG65-Coaxial-Cable or RG186 http://www.awcwire.com/ProductSpec.aspx?id=RG1
> 86-Coaxial-Cable
Interesting stuff. Thanks.
RG-65 says no longer available. It also says:
Coaxial Delay Line 0.15 uSec/ft
(Am I having troubles counting zeros, or is that seriously slow?)
Nom. Imp. 950
Vel. of Prop. 2 (no units)
Cond. Material Magnet Wire Helix
(What is "magnet wire", and what does "helix" mean and how does it effect
coax?)
RG186 says:
Shield Material Magnet Wire [What does that mean?]
Nom. Imp. 1000
The cable on scope probes (at least fancy ones) has a tiny conductor. I
think that translates into high impedance.
--
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