Joseph Gray wrote:
Interesting followup. With the exact same setup, but replacing the tee
with a Wenzel power divider, I get 18.6 ns.
Resistive or rf power divider?
Using the latter may result in significant reflections.
On Sat, Apr 2, 2011 at 7:42 PM, Joseph Gray<[email protected]> 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
Bruce
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