[time-nuts] T.I. experimenting - newbie question

[Joseph Gray]

Interesting followup. With the exact same setup, but replacing the tee
with a Wenzel power divider, I get 18.6 ns.

On Sat, Apr 2, 2011 at 7:42 PM, Joseph Gray <jgray at zianet.com> wrote:
> I have a borrowed HP 5328A with the Universal Module. I'm using
> averaging mode and auto triggering. Counter does not have the OCXO
> option. I'm using the internal oscillator, not locking to my GPSDO.
>
> I was just messing around with a length of Belden 9273 and the 100 KHz
> square wave output from my Spectracom distribution amp. Start signal
> is the 100 KHz signal. Using a tee, the stop signal is the same 100
> KHz after passing through the length of coax. I'm reading 18.9 ns. The
> coax specs give a VOP of 66%. This should calculate out to a length of
> 3.74 M. When I measure the coax, I get 3.8 M.
>
> I am including the BNC connectors in my length measurement. If I
> subtract them, I'm much closer to my calculated length. Should the BNC
> connector lengths be included or not? Or, is the measurement I'm
> getting as good as it gets with this HP counter?
>
> Joe Gray
> W5JG
>