Hi Dave, Stefan, LF ! :-)
Well, the big coil (double
layer) is wound in the right sense, as CCW. Just as the other coils
But unfortunately it is wound
top to bottom, and the coils in the pipe are wound bottom to top
Reversing the plastic bucket I
would place both coil winds bottom to top but in opposite senses (inner
CCW outer CW)
which I'm afraid would not work
either. Right ?
Effectively this makes the
fields to cancel when you get one into the other. Already tested ! :(
Taking the last coil appart will
be probably the best option. Can rewind the second coil, which would be
the easier way to get
both coils coupled, but Q will
reduce with coupled coils and seems I do not need so much inductance to
reach LF
Luis
Good job!
But if the top coil is wound the wrong way it will be subracting
from the main coil.
Move it away from it, maybe stand it on something else a metre
away, this will reduce the mutual coupling and increase the total
inductance.
If it had been would the same way, as Stefan said, moving it
closer would increase the inductance - but as it is the wrong way it
decreases!
73
Dave G3YXM
On 11 April 2016 at 10:05 VIGILANT Luis
Fernández <[email protected]> wrote:
Hi
LF
My
progress to get access to LF:
Added a
coil on top of the 300mm pipe. With this in series can reach resonance
at 270KHz
Then
added another coil. Two layers winding, reaching 152KHz
I'm
afraid I winded "the wrong way" to get it working as yougurt cup over
the top coil. Will try to
reverse
it. Anyway a convenient fixing (not the one shown in picture) can be
made keeping one over the other
Next
is to play with top load capacitive wires to increase capacity and get
it down to 137KHz
.....keep
tuned ! ;-)
