[Elecraft] Checking Toroids brfore Soldering

[Don Wilhelm]

Ron and all,
I don't know the actual inductance of the toroids - I have not measured
mine, but if you are certain you used the correct core and they are wound
with the correct number of turns, then they are correct no matter what any
inductance meter or other calculation says.  Perhaps in the next re-write of
the manuals Elecraft will include the 'correct' inductance values for the
toroids - particularly the RFCxx toroids.

In short - put away your inductance meter and put the perscibed number of
turns on the toroids - and be confident that it will work.  BTW - always
count the turns going through the center of the core and not necessarily the
turns around the outside - with toroids, a single wire straight through the
core is 1 turn (in this case there would be no turns on the outside -
contemplate that to realize the importance of this subtle point).

73,
Don Wilhelm  - Wake Forest, NC   W3FPR home page: http://www.qsl.net/w3fpr/
  QRP-L # 485   K2  SN 0020   mailto: w3fpr@arrl.net

*** Life is what happens when you're making other plans -- Mike Cross  ***

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

> Has anyone checked their toroid inductors after winding them with a DMM
> (inductance) to see if they agree with the values shown in the schematic
or
> apendix A?  I was checking the  values to see if I didn"t pick the wrong
> toroid out of the little envelope. Well, RFC14 and RFC16 measured value
> didn't agree with the K2 Appendix A, they were about three times higher.