With wider turn spacings capacity between turns is lower and coil Q higher.
Centre loading is more sufficient then base loading on shortened antennas.
Silver plating of coils with cool-amp is for the birds.
73
Peter
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim
Thomson
## If u look at F12s application notes in ur above url..... they still
havent done it right with their new seco coils. They used
1/4 inch al tubing, but with a whopping 3/8 inch spacing between turns.
Whats required is just 1/4 inch spacing between turns.
## what they shoulda done was used .25 inch spacing between turns, that
alone would have increased the uh by a bunch, and tips would end
up being the same as oem.
## Cu tubing, also in 15-25-50 foot rolls, is easy to form into a coil,
albeit, its one helluva lot more rigid. I silver plated mine with the
cool-amp glop..1st,
then wound each coil. Coil placement is yet another issue. If the coil is
placed half way out each side, its uh has to be aprx double, vs the coil
being at the boom.
A good compromise is aprx 1/4 way out on each side. Then the coils don't
have to be huge.
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