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Re: Undamped oscillations
Original poster: <davep@xxxxxxxx>
> I've read that before and found it most interesting. What a pity
> it is that we don't have all his lab records from that time to know
> exactly what he did, how he measured things, and what the results were!
> I suspect that to him ISOCHRONOUS meant to a part in a
> thousand at best, but plenty good enough for the purpose at
> hand. The note from the one remaining Alexanderson alternator at
> Grimeton, Sweden, appears to be stable (at least short term) to about 1
> Hz out of 17.5 kHz but I haven't seen a description of the control
> mechanism for the prime mover.
I have some vintage GE docs on one of their transmitter alternators,
but they are buried. 8)>>.
Among other things i recall it involving trick relaying
so that as the RF output went on and off, the load on
the alternator stayed constant: that is, RF power not used was
diverted to a dummy load. (I have the feeling thats not
exact, but along that line of thought.) Wish I could