Re: 1/4 wave theory/cite the variance?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>


>> Perhaps your modern view and Tesla's view are both right?

	Perhaps.  Unlikely to account completely.

>> The arguments being brought up in favor of an adjustment to quarter wave
>> are based on tightly wound coils with self-capacitance and tightly
>> coupled inductance between the wires.

>> If you'll look carefully at all the pictures in CSN, you will see that all
>> of Tesla's coils are space wound, thus eliminating

	I would suggest the effects are REDUCED, rather than eliminated.

>> the effects you're mentioning.  Also, Tesla utilizes space winding on his
>> large flat spiral secondary.

	Where was this used?
	I see flat sense coils in the Colorado Springs Notes, rather than
	secondaries.
 

>> The 1/4 wave resonant frequency of a wire, when wound into a
>> solenoid, is typically more than 50% higher than that of the
>> straight line value.

	This depends, critically, on the aspect ratio (length/diameter)
	Books discussing RF (antenna) practice typically allow
	100% higher for really long/narrow coils, narrower than
	ever used in Tesla Coil work.  50% higher is likely apt
	for some specific aspect ratio.

	best
	dwp