[time-nuts] High rate, high precision/accuracy time interval counter methods

[Gerhard Hoffmann]

Am 06.05.2016 um 01:00 schrieb Mike Monett:
> I have been thinking along the same lines, to combine multiple OCXOS's to
> obtain lower phase noise. But an N-way Wilkinson could get tedious. After
> you calculate the impedances for each leg, you then have to convert them to
> lumped-element equivalents to run at 10 MHz, as shown here:
NoNoNo, you can build a replacement with a 1:1 balun transformer and a 
100 Ohms resistor.
With a little bit of ferrite this is both broadband and small.
It presents a 25 Ohms input resistance in a 50 Ohm system, so you need 
another wideband
transformer with a 2/3 windings ratio. The resulting 4/9 impedance ratio 
is close enough
to provide the impedance match from 25 to the 50 Ohm source.
That's probably what's inside a MiniCircuits PSC2-1. I have never opened 
one but I don't
have much doubt.
They also have solutions for 8:1 and 16:1, but it can be cheaper d.i.y..

Someone in the US is currently selling 10 PSC2-1 on ebay  IIRC. But for 
me being in Europe the
transport would probably cost more than what it's worth.

regards, Gerhard