[HomeBrew] One more stupid toroid question (well, maybe two)

[Philip Atchley]

Hi,
Y'All are gonna think I'm a dunce, but here we go again.  I thought I had a
pretty good understanding of Electronics (nearly 50 years altogether) but my
education is lacking in some areas (like toroid construction).  I don't wish
to waste my enameled wire winding coils that "don't work as calculated".  I
searched Google but didn't find the answers.

I know that if you are winding a toroid (or are using clamp on ferrites), if
you wind your coil on two (or more)Toroids instead of one, the inductance goes
up.

Question 1.  Is this a linear function?  In other words, as an example only,
if I wind a 30 turn coil on "Core X" and I have 10uH of inductance, will
winding that same coil on 2 adjacent cores of the same material give me 20uH?
Or would I be better off winding two separate 30 turn coils on two cores and
then put them in series (should be roughly the same amount of wire)?

Question 2.  I know that coils on toroids are usually wound with one layer and
that maximum wire size is determined by the number of turns and the core
diameter (makes sense to me :).  IF I want to put more turns on the coil so
that it's more than 1 turn deep in the "donut hole", is there any degradation,
other than perhaps interwinding capacitance?  In other word, does it hurt
anything to "stuff it"?

73 de Phil,  KO6BB
http://users.mercednet.com/beaconeer/

DXing from the "Beaconeers Lair".
Where DX begins at the noise floor and 946
different LF beacons have been heard since June/99.
Merced, Central California, 37.3N  120.48W  CM97sh