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TSG vs RSG



Original poster: "Jason by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>

Hi all,

I realise that I might be flamed or something for saying this, but anyway
just hear me out...

I recently finished my 200BPS sync rotary gap. It wails like a banshee and
when phase set at exactly the right point the streamer output is around 3.5'
point to point, which I believe to be pretty good for 10/80 neon. My cap is
a 2x LTR (35nF) and my secondary is a standard 4" form. When I re-phase it
to run at 100BPS, the streamer output is decreased to about 3 feet, but this
can be remedied by removing about 5nF from the cap and retuning. The spacing
on the RSG is currently 0.7mm.

I recently built a quick-ish triggered gap. It is basically three 10mm brass
rods set about 30KV apart in a plastic formed U-shape. My ignition coil
(sorry not a GMHEIC :) is triggered by carbon brush contacts that have been
mounted on my 200 break rotary touching a piece of copper pipe for each
connection, so in effect the ignition coil is running at the same breakrate
and phase break as my rotary. I use a 22uF PFC cap in series. When I fire it
up, the firing sounds very regular, and looks it too. Sometimes power arcs
form so I added a vaccum cleaner and a pair of bent pieces of acrylic to
turn it into a triggered vortex gap.

The strange thing is, that even with this reliable sounding and regular
firing gap, I only get about 2.5' output max - which is surprising and
dissappointing. Now I am nowhere near as experienced at coiling as people
like Marc but it seems to me that triggered gaps are not really the way to
go - at least not for coils that are running at a significant voltage (i.e.
enough to break down their own gap). I always assumed that the losses from a
TSG would be higher than from a sync. rotary and this seems to have proved
me right.

Has anyone had any similar experience comparing their rotary to their TSG???
I only ask becuase it seems to me that with so muuch faith currently in
these TSG systems, I must be doing someting wrong :)

Best regards,
Jason