[Elecraft] Practical toroid winding question

[W3FPR - Don Wilhelm]

Mike,

Wind the toroids as specified - the K2 will work great with the specified 
number of turns, and there are over 4000 of them already built to confirm 
that statement.

Be certain to count each turn that passes through the center of the core. 
If only the turns on the outside are counted, it is easy to miscount (the 
two free ends constitute a turn too).

I should also ask, just how much can you trust your inductance meter?  If it 
does not measure the inductance at the operating frequency, that alone may 
be the answer to the mystery.

73,
Don W3FPR

----- Original Message ----- 

I am almost ready to start winding toroids for my K2.  I have run into this 
question before but never found an answer.

Suppose I wind a toroid, then check its inductance afterwards.  I find that 
the value is not exactly the same value as the schematic calls for, but 
after removing one turn (or adding one turn), it's perfect.

Should you,

a)  use the # of turns in the assembly instructions, regardless of the value 
obtained, since the designer knows a lot more than I do
b)  change the number of turns, since the performance of the radio is based 
on the value of the inductance

Wayne and Eric, I'd like to hear your answer on this as well.