[BCVHFA] Lissajous figures

[K8CM]

>
>Do you know about Lissajous figures?  An early method of comparing two 
>frequencies using an oscilloscope.  A known frequency is applied to the 
>horizontal amplifier input and the frequency being measured to the 
>vertical amplifier input.  When the display forms a stationary circle, 
>elipse, or line, the frequencies are exactly the same.  The difference 
>between having a line, circle, or elipse speaks to the phase relationship 
>between the two signals; a line is 0 degrees, circle 90 degrees, and ab 
>elipse, between 0  and  90 degrees.
>
>For extra fun check out this:
>http://www.math.com/students/wonders/lissajous/lissajous.html
>
>73 <>  Carl