[TCML] RSG speeds vs notches
list at future-technologies.co.uk
Tue Nov 13 06:31:32 MST 2007
with my RSG I used a vac motor and use it on a variac to change the speed.
It works very well and gives a good range. However I imagine a higher speed
would be useful in lowering the conduction time of the spark gap (always
aiming for the first notch!) The motor will have to run fast with a large
disc to manage it, though do not see any reason why it is not possible.
The problem is as the gap is not in sync with the mains cycles, it is very
hit and miss so higher speeds work very poor. As such , I wonder if I just
use some microwave diodes and convert the NST output to DC. Its not really a
DC coil, just thinking of charging the tank cap up and it holding its charge
until the RSG fires, the diodes just preventing the tank from discharging.
I suppose the other way is to just a sync cap though it will be in perfect
sync with the mains, there is no way to alter break rates. The only way
would be to build a variation of RSG disc making them larger and increases
break rate speed.
I am not really sure how to work it out. For example if the tank cap
discharges in 100uS then the RSG needs to conduct for 100uS only. In this
case it *should* be first notch quench. However it seems nobody manages it
It would seem 3rd or 4th notch is the normal, but why not build the RSG disc
larger in dia to increase break rate speeds ? Or even place multiple
electrodes across the disc so you can tap up or down the electrodes and
alter the break rate ? I would have thought most people would build RSG in
this way ?
I understand that if the break rate is to fast the tank will not discharge
fully. I also understand that if the break is to slow this is where the
notches come into play as energy passes to and from primary to secondary
reducing efficiency until eventually around the 4th notch the spark gap
So either I am missing something or this type of gap is technically
impossible to build in someway ? Maybe a normal RSG disc would need to be 4
times larger in dia to increase the break rate 4 times ?
I suppose it is hard to work out the exact discharge time and the spark gap
break rate times. It is why I wonder about building a disc with rows of
contacts rather than just the normal 1 row. Then if you have several rows of
contacts, you can adjust the break rate speeds by tapping up or down the
rows.. the outer rows speed faster than the inner rows... Then I would
imagine there would be a optimum row where spark output would be slightly
better than the rows each side of that particular tap....
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