RE: twin coil transmission lines (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 30 May 2007 17:53:00 -0600
From: S&JY <youngs@xxxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: twin coil transmission lines (fwd)

David,

1) Keep in mind you get about a 1.4 streamer length multiplier between the
toroids of a twin.  I believe this more than makes up for losses in the
lines connecting the two primaries.

2) I use three telescoping rigid copper pipe sets - two for the primary and
the third for the ground.  These go straight between the two coils.  The MMC
& spark gap are under one of the two coils.  The telescoping pipes allow a
large range of spacing between the two coils.  Where the pipes telescope,
the larger one has 4 "V"s cut in it so a hose clamp brings the outer pipe
into low resistance contact with the inside pipe.  It works very well.

3) I suspect you can consider the transmission line to be similar to an
off-axis coil in series with the primary.  It affects tuning, but the losses
aren't that significant.

--Steve Y.

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx] 
Sent: Wednesday, May 30, 2007 10:35 AM
To: tesla@xxxxxxxxxx
Subject: twin coil transmission lines (fwd)

Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 30 May 2007 14:54:42 +0000
From: David Rieben <drieben@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Cc: drieben@xxxxxxxxxxx
Subject: twin coil transmission lines

Hi all,

I have a question regarding the transmission lines between large 
twin coil systems that's been bugging me for a while now. I have
never seriously considered building a large twin coil or magnifier 
system, mainly due to the large space that one of these systems 
eats up when assembled. However, I know that there's also 
considerable line losses in the transmission lines that carry the RF 
currents from the SG and capacitor to the primary coil(s) and that's
the reason that we usually try to keep the tank circuit wiring
between the SG/capacitor to the primary coil as short as possible
in a basic 2-coil SG system. My question is how do you manage
these losses to acceptable levels in the primary transmission lines 
of large twin coil systems where the 2 primary coils may be 
spaced 10 to 20 ft. or more apart and wired in series? I would
assume that keeping the lines as straight as possible and with a
relatively large radius of curvature (ROC) would help to keep
the inductive and corona losses, respectively, at bay.

Thanks,
David Rieben




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