RE: space winding

["John H. Couture" <couturejh-at-worldnet.att-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Marc -

Log Dec has to do with how fast the dampened wave of the operating Tesla
coil decreases. A larger Log Dec means the wave reduces much faster. In the
days of spark radio transmitters a low Log Dec was desirable because this
gave a clearer signal and was easier to read. It was not until the invention
of the vacuum tube that zero Log Decs were possible and voice and video
could be transmitted by the radio signal (carrier wave). However, low Log
Decs are not desirable for Tesla coils because the long ring times means
inefficient coils. Much more can be found about Log Decs in old radio books.

Pi is the ratio of the circumference to the radius of a circle. Pi is a
constant and always equals 3.1416 for all circles. It is interesting to note
that Log Dec times Q factor equals a constant or 3.1416 for all true Tesla
coils. So-called tube Tesla coils equal zero Log Dec times Q factor equals
zero.

John Couture

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-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Tuesday, August 08, 2000 6:07 PM
To: tesla-at-pupman-dot-com
Subject: Re: space winding


Original poster: "Metlicka Marc" <mystuffs-at-orwell-dot-net>

hello john,
can i show my ignorance and ask "what is log dec" and is that pi=3.1416?

just a dummy,  marc