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Published on Mar 8, 2014
This is a comparison of different RSG systems on the same 10 inch coil which normally uses a 364 bps Asynchronous rotary. This was removed and replaced with a 200 bps Synchronous rotary. Both use a 12 inch rotor, and solid copper bar heat sinks for their stationary electrodes, so any differences should be down to either the behaviour of 364 bps against 200 bps, or asynchronous against synchronous. There were three noticeable differences: sound, streamer behaviour and performance. Firstly the easy one - sound. The asynchronous 364 bps system has a nice 'rasp' to the sound, whereas the 200 bps synchronous system had a distinctive 'drone' to the sound. This rasp of the asynchronous is easily explained by looking at the uneven MMC voltages, which are ultimately transferred to the streamers. Get the phase slightly wrong on the 200bps though and it will sound like the asynchronous system. Streamer behaviour: Not so noticeable, but the async' system seems to produce slightly more frantic streamers, hastily changing direction all the time, while the sync' 200 system seems to have streamers that reach out more to latch onto things. Performance. With the top of the toroid being just less than 6 foot from the ceiling, the performance of this coil will never truly be seen. But as the conditions were the same for both tests a comparison is still valid. I feel the 200 bps sync' or "BPS One" system is the slight winner here, although if the asynchronous ran a higher bps rate it would undoubtedly win I think.
The sound is muted initially, to get you guessing on which coil is which.