[time-nuts] Trimble Thunderbolt E frequency pulling

[Al Wolfe]

Nigel,
    Set your counter to high impedance. Then install a T connector on the 
input. Then you can install or remove a 50 ohm terminator on the T while 
plotting the results. Then you can see how fast the frequency shift is 
depending on the load.

AL, k9si

> Switching the impedance at the counter itself resets any plot  that's in
> progress, which does introduce some delay, so I put together a  small 
> switch
> box that could be inserted into the coax and confirmed it's a  rapid 
> effect
> that's unlikely to be thermal.