[time-nuts] Comparing PPS from 2 GPS units

Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Dec 18 05:59:22 UTC 2012


Hal Murray wrote:
> 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?)
>
>    
Magnet wire is enamelled wire (usually copper).
> 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.
>
>
>    
Bruce



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