[Lowfer] Still looking for a capacitance dissapation factor test

[Lisa Cianciolo]

Hello Folks,
 
Acces to email is kind of spotty here at work today. I am in the process of changing computers.  Back to the good stuff.
 
In order to resonate my 5/8" Cu loop it took 488 PF.   The capacitor consisted of a transmitting .0004 mica Bakelite block, soldered directly to a 300 PF wide spaced  variable air capacitor.  This arrangement seems to work ok if not a little difficult tune.
 
My LCR meter unfortunately is of the type that uses a 1 Khz signal for testing. 
So does anyone know of a test that I can perform at 1704Khz to measure the loss in the cap?
 
I have made my own air variable from copper tubing using a TEFLON bushing at each  end of the and sliding another tube down the middle.  The bushing let the capacitor have of dielectric made primarily of air.
 
If I made a voltage divider with say a resistance and the cap in series, wouldn't I be able to see the voltage drop across each component with a scope?
 
Any help appreciated.
 
Thank you
 
PaulC
W1VLF
 
 



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