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Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
You will usually hear a slow modulation in the speed of the motor as it operates. The speed varies at about 2Hz if I'm not mistaken, but it is noticable. You will also notice that in the overall performance of the coil. The output spark length will grow and diminish somewhat as the motor phases in and out. But overall, the synchronous is much less troublesome.
Wow, i never experienced that with any of my synch gaps... sounds like you have something funny going on there. Mine just sounded completely solid, no low frequency oscillations of phasing that i could ever detect.
I agree with what has been said. If you use an ARSG with a NST powered coil, have an RC filter on the NST with safety gaps from each bushing of the NST to ground. Its also a good idea to put a safety gap across the spark gap, so in case the spark gap doesnt fire before the cap has reached some critical voltage, the safety will break down instead. If you run the ARSG at above 240bps, this will minimize the chance of overcharging your tank capacitor.
Actually, since you have never used a rotary gap before, you might just want to construct a static gap for now and play it safe.
Registered Member #305
Joined: Sat Mar 11 2006, 04:27PM
Location: Liverpool, UK
Posts: 29
thanks for your advice guys, i may do as steve said and use my static spark gap that i built here http://4hv.org/e107_plugins/forum/forum_viewtopic.php?12914 then if all goes well i'll filter the output of the NST and try it with the RSG
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
That does sound odd. A sync motor shouldn't make any oscillating or phasing sounds like that unless it's not syncing properly. If your spark gap motor is running in this "Almost sync but not quite" condition, that's about the worst thing you could do to your supply transformer, so you need to get it fixed. Having said that, a safety gap should protect the transformer, but it still spoils the look of the thing by making the streamers grow and shrink.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
The transformer is 6kV at 100-130mA? The 8.5kV should *just* make it. The .1uF might be too large, though. Id go for about .066-.086uF. Maybe you can rearrange some of the caps to give it a little more voltage and less capacitance?
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Just bought this off eBay...
