[Elecraft] H.e.l.p! (now torioid wire gauge)
Don Wilhelm
[email protected]
Wed Jan 28 19:11:00 2004
Tom,
The wire gauge used in the base K2 is #26 as do most of the options, the
KSB2 uses #28 wire, and the low pass filter toroids and L18 in the KPA100
are wound with #22 wire (quite stiff).
The wire gauge to be used depends first on the current that the winding must
carry (so don't reduce the gauge of the toroids used in the Low Pass
filters), secondly on ease of winding - larger wires won't break easily, but
don't bend as easily, and third, the size of the core is a factor when the
number of turns becomes large enough - one would like to have the turns all
fit while not overlapping the wires. The inductance of the toroidal coil
will not change (at least not noticably) with a change in the wire gauge -
it is the number of times the wire passes through the center of the core
that will determine the inductance.
(Compressing/spreading turns may change the apparent inductance a slight
amount, but this change is more likely produced by the change in
interwinding capacitance - pure physics says that is fact, inductance
measurements may leave some doubts - but be aware that many inductance
meters use tuned circuits with an assumption of zero external capacitance
for their measurements.)
73,
Don W3FPR
----- Original Message -----
> Hi Gang,
> I'm thinking of pulling a few of the torroids and re-winding them. Cam
> you tell me what (a) what is the gauge of the wire? and (b) does the used
> gauge matter?
>