[time-nuts] 10 MHz clock distribution for the lab
dlewis6767 at austin.rr.com
dlewis6767 at austin.rr.com
Fri Apr 19 00:54:42 UTC 2013
External reference inputs are definitely not all '50-ohms.'
'Learned the hard way.
You need to read the specs on each piece of equipment.
Input impedances will vary all over the map, even within the HP line.
-Don
---- Hal Murray <hmurray at megapathdsl.net> wrote:
>
> caf at omen.com said:
> > I have a FlexRadio 1500, Racal 1992 counter, HP 3586, Advantest U3641, and
> > Gigatronics 6061A daisy-chained off my Thunderbolt. Don't throw out those
> > BNC T connectors.
>
> I thought most boxes would have an internal 50 ohm terminator so at first,
> I'm a bit surprised that it works.
>
> If cables are short (which is not hard at 10 MHz), it would just be a
> resistive divider. If the source impedance is low, it's just more work for
> the driver. If the source includes 50 ohms, that's a 5:1 (1/6) divider so it
> probably works if the receivers are reasonably sensitive.
>
>
>
> --
> These are my opinions. I hate spam.
>
>
>
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