Bert,
One caution. The resonance method of of measuring inductance, while often
OK for normal work, does not consider the effects of inter-winding
capacitance. Hence, depending on the spacing of the turns, it may or may
not be accurate enough.
73,
Joe, W1JR
.
At 04:07 PM 3/13/2002 -0500, N4CW@aol.com wrote:
>Seldom mentioned nowadays is the use of a grid-dip meter to measure the value
>of an inductor. Using a known capacitance in parallel with the inductor, you
>loosely couple the grid dip meter to the coil and tune for the dip. Once the
>resonant frequency is determined, you use the formula for a parallel resonant
>circuit, manipulate and solve for the inductance. Voila!
>Of course, it's not a very precise figure that you'll arrive at, but it will
>suffice.
>Other instruments "of days gone by" are the Q-meter (Heathkit had a great
>one!), and an inductance bridge (General Radio/GenRad had several models).
>And, would you believe, some inexpensive multimeters on the market can
>measure inductance, too.
>73,
>Bert N4CW
>_______________________________________________
>Towertalk mailing list
>Towertalk@contesting.com
>http://lists.contesting.com/mailman/listinfo/towertalk
|