[time-nuts] 0MHz distribution...NOT

[Michael Blazer]

You may want to take a look at the signal on a scope.  Most instruments 
terminate their reference input.  You might actually have 4 50 ohm loads 
on the Thunderbolt's output and the input voltage might be marginal.  If 
your instruments have both reference input and output, it's better to 
daisy chain the units.


On 3/10/2012 5:10 PM, Chuck Forsberg WA7KGX N2469R wrote:
> A month or two ago I had sketched out a simple distribution amp
> for my 10 MHz reference.   In the meantime I became somewhat
> disillusioned about my FE-5680a standards.   So I removed the
> FE-5680a and disconnected its power supply from the box that
> holds the Thunderbolt, power supply, and big line filter.
>
> I decided to try daisy-chaining the Thunderbolt's 10 MHz output.
> I have plenty of hardware left over from the days of 10BaseT networking.
>
> So I have the Thunderbolt going to a BNC T on the back of my FlexRadio 
> 1500,
> hence to my Advantest U3641 spectrum analyzer, and finally to the 
> external
> reference on my Racal-Dana 1992 nanosecond universal counter.  That end
> has a 50 ohm termination on the other side of its T connector.
>
> All three devices seem happy with the 10 MHz they are receiving.
>