Hi all.
I wonder how the LF coil should look like because I experienced following problem.
I made "loading coil" on diameter 80mm, length of coil about 100mm. Turn by turn
with litz wire. This litz has got outer diameter about 1.2mm. There are about 7
layers
or so. There are two coils in series, one tapped and the second similar as a vario. When
I tune to DCF39 on 139 kHz I experince two maxima! No matter whether I tune switching
taps or rotating with inner coil of the vario. The maxima are not far from each other and they
are of about the same heigth. I suspect that the coils have a very high capacity themselves
so ones I tune antenna capacity and the other time capacity of the coil. I
wonder how
the loading coil will behave with TX. If this is true there should be only one
maximum
measuring antenna current. Anyway I take this as a proof that coils doesn't do
their
job properly. Does anybody have a different explanation?
73 Petr, OK1FIG
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Od: Soegiono, Gamal[SMTP:[email protected]]
Odesláno: 24. cervna 1999 10:08
Komu: [email protected]
Predmet: LF: coil wind prob, evolution-1
Hello all
recently I asked some coil winding questions.
Now I am able to answer them to some extend by myself:
...
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