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Re: Reciever Coil - Wow!


From: 	Jeff W. Parisse[SMTP:jparisse-at-ddlabs-dot-com]
Sent: 	Sunday, November 09, 1997 8:34 PM
To: 	Tesla List
Cc: 	Brent Turner; Mark Bean; Franklin Londin
Subject: 	Reciever Coil - Wow!

 
All,

Last night, my cohorts and I were experimenting with a 
tuned receiver coil and our DC tube coil. The tube coil
is tuned to 356kHz and the receiver coil is wound to
approximately 500kHz with a toroid to bring it down to
the 356kHz range. The transmitting coil uses two 250TH
tubes and processes about 3800Vdc at 700mA.

We were very surprised at the power of the receiver coil!
A grounded metal object would pull a very hot arc up to
about 4-5 inches that looked more like the arc from a 
120ma neon transformer than the top of a Tesla coil.
When the same metal object was held above the toriod,
more familiar Tesla like electrical discharges would
erupt from it towards the toroid. These discharges were
the same length as the maximum discharges from the
transmitting TC. The receiver coil was about two feet
from the transmitter.

I've learned in the past few months that tube coils don't
tolerate toroids very well because of the additional load
they present to the tubes (my layperson understanding).
Using a top loaded receiver coil seems to circumvent this
limitation and offer a way to investigate terminal capacitance
phenomena with a vacuum tube Tesla coil.

Jeff W. Parisse, Art Director
Digital Design Laboratories
www.ddlabs-dot-com
All,
 
Last night, my cohorts and I were experimenting with a
tuned receiver coil and our DC tube coil. The tube coil
is tuned to 356kHz and the receiver coil is wound to
approximately 500kHz with a toroid to bring it down to 
the 356kHz range. The transmitting coil uses two 250TH 
tubes and processes about 3800Vdc at 700mA. 
 
We were very surprised at the power of the receiver coil!
A grounded metal object would pull a very hot arc up to
about 4-5 inches that looked more like the arc from a  
120ma neon transformer than the top of a Tesla coil. 
When the same metal object was held above the toriod, 
more familiar Tesla like electrical discharges would
erupt from it towards the toroid. These discharges were 
the same length as the maximum discharges from the
transmitting TC. The receiver coil was about two feet
from the transmitter.
 
I've learned in the past few months that tube coils don't
tolerate toroids very well because of the additional load
they present to the tubes (my layperson understanding). 
Using a top loaded receiver coil seems to circumvent this
limitation and offer a way to investigate terminal capacitance
phenomena with a vacuum tube Tesla coil. 
 
Jeff W. Parisse, Art Director
Digital Design Laboratories
www.ddlabs-dot-com