My attempt to understand your diagram, not sure about how the quadrature hybrid is connected.
Stanley ----- Original Message ---- From: J. Forster <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Sun, July 25, 2010 10:29:23 AM Subject: Re: [time-nuts] Basic question regarding comparing two frequencies There is a cute way to use a scope. It requires a power splittere, a quadrature hybrid, and two mixers (all appropriate for the frequencies you are comparing), and an X-Y scope. Mini-Circuits sells appropriate parts. The stuff is hooked up like this: X Axis S | H P ---- MIX ---- Y REF 1--L B -- REF2 I ---- MIX ---- R T | I Y Axis D The 'scope display will be roughly a circle if the frequencies are a bit different and the spot will go around CW or CCW depending on which Ref is higher. -John <snip>
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