Thanks for mentioning that Vic,
I have seen that in the Elecraft manuals and I don't expect the
inductance I measure to be exact to what the schematics call for.
It's just nice to see that it's close. Especially when there might
be some confusion about the cores, when they look similar.
For instance, the K1 Noise Blanker, the two cores are very similar in
appearance. But almost the same number of turns on both of them,
will produce two values that are different by a huge margin.
So I should have mentioned in my original post, that I used the LC
meter to just 'ball-park' the toroids. When the measurements were
off, I wouldn't change the windings but would rather, double-check
that the number of turns was correct and that I used the right core.
73 de Stephanie
va3uxb
K2#5311 - K1#2132
On 27-Jan-06, at 11.22 .22, Vic K2VCO wrote:
This comes up once in a while, and for the benefit of those (like
Stephanie) who may not have seen it before:
The measured inductance of a toroid depends on the frequency at
which it's measured because of the characteristics of the toroid
material. I don't know the frequency used by the AADE unit, but if
it's far from the operating frequency of a particular toroid, the
results might be misleading.
Elecraft has said that they do *not* recommend meauring toroid
inductance, just winding the specified number of turns.
If you must measure the inductance of a toroid, it would be better
to use something like an antenna analyzer which will allow you to
select the frequency at which the measurement is made.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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