[R-390] 400hz converters

[Tom Norris]

The show up on Ebay every now and again pretty cheaply too. most can be
adjusted to 400 hz easily.

Tom


>A few years ago I got very much into ARC58 /TRC75 and after using 
>all sorts of aircraft alternators that sound like a 747 on full 
>boost ,I found that there is a product desighned for running motors 
>at variable speed I contacted the company and recovered 2 systems 
>from their rubbish bin and made a good system , briefly it consisted 
>of a ring counter driving some large transistors and was single 
>phase input and 3 phase out put at at 4kva, it generated a multi 
>stepped square wave that after filtering was  compatable with the 
>gear and was permanently set to 400Hz, it ran here for many years 
>with no problems , preceding this I was using a PP2352 unit that ran 
>on 28v dc and was one of the most unreliable pieces of electronics 
>that I have owned, it used to generate internal spikes and was 
>always blowing the big germanium power transistors which were 
>individually fused and would gradually die , the motor controller 
>was a great improvment, I am sure they have them in the states HI
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