Stefan,
Yes, using the whole
circumference is better
Agreed...
, especially when the
core is driven close to saturation
...but
with a partial winding I would expect *less* danger for the core to saturate
(given the same current).
If you
wind only a part of the core more of the magnetic field can escape und you get
less flux
inside
the core but more leakage inductance..
73
Clemens
DL4RAJ
Mal,
Am 15.12.2012 23:06, schrieb mal hamilton:
Gary
I see you only wind on half the ferrite core whereas I
spread the turns symetrically around the whole circumference.
In my case I need 8 turns on Prim es 24 on Sec.
I first wind the 24 turns around the
circumference evenly then the 8 tunrns on top also evenly. This works
for me.
I wonder if there is any real difference in
efficiency
Yes, using the whole circumference is
better, especially when the core is driven close to saturation. Also the AL
value from the datasheet for a certain core assumes a homogen spread of the
turns.
Warren,
Yes, of course you can make taps on the
secondary side. I'm doing this in my MF matchbox, using a 6 pole switch. This
allows to rise the power in 3 dB steps...
73,
Stefan/DK7FC
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