[BC] Determining a coil

[RichardBJohnson at comcast.net]

Use a L/C meter. If you don't have one, you can "make" one using a signal generator, a scope and a few capacitors you might have hanging around.

You connect a capacitor across the coil and find the frequency, using the signal generator and a scope, that the circuit resonates. In the 'olden days we had "grid dippers" to find resonance. Then, from the formula we were all required to remember --even to get the FCC 2nd class ticket, F = 1 /( 2 * PI * sqrt(L * C)), you find the value of L because you know C and F.

Cheers,
Richard B. Johnson
Book: http://www.AbominableFirebug.com/

----- Original Message -----
From: "Edwin Bukont" <ebukont at msn.com>

I know is has been posted here before, but can someone please repeat the method to determine the value of the large coils that we use in AM networks.
 
I have a large collection of them to sell (from a 5kW array) and want to approx. their inductance.
 
Thank you