Sujet : Re: Twiddlesticks
De : jeffl (at) *nospam* cruzio.com (Jeff Liebermann)
Groupes : sci.electronics.repairDate : 20. Jun 2025, 04:24:45
Autres entêtes
Message-ID : <7ik95klbru3pnc3voma6m28frq0ks3pg54@4ax.com>
References : 1 2 3 4
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On Thu, 19 Jun 2025 19:15:28 -0700, Jeff Liebermann <
jeffl@cruzio.com>
wrote:
(...)
More than you probably wanted to know:
"Dielectric Properties of Wood and Hardboard. Variations with
Temperature, Frequency, Moisture Content and Grain Orientation"
<
https://www.fpl.fs.usda.gov/documnts/fplrp/fplrp245.pdf>
This is from 1975, so there's nothing with the latest test equipment.
The woods tested are Oak and Douglas Fir. Lots of graphs and tables.
Most show the variations in the various parameters with different
humidity levels. The changes in dielectric constant and loss tangent
are quite large. This might be a clue why we don't see many wooden
coil forms.
-- Jeff Liebermann jeffl@cruzio.comPO Box 272 http://www.LearnByDestroying.comBen Lomond CA 95005-0272Skype: JeffLiebermann AE6KS 831-336-2558
Twiddlesticks
Re: Twiddlesticks
