[Boatanchors] 3-phase for BA transmitters?

[Charles Ring]

What is there, useful to hams, that requires 3 phase power?

73 de W3NU

On 11/18/2012 1635, Nick England wrote:
> Has anyone actually tried a Variable Frequency Drive as a way of
> obtaining 3-phase for vintage high power transmitters?
> VFD's are solid state devices that are normally used as motor
> controllers, and they are available as 220v 1-phase to 3-phase
> converters.
> BUT (big BUT) all the ones I have seen say DO NOT switch the load
> (which is exactly what you need to do in a transmitter).
> I'm also wary about xfmr heating from harmonics from these switching gadgets.
>
> Any direct experience with transmitter applications - or a pointer to
> some gadget I've missed that woud be happy in the application - is
> greatly appreciated.
>
> So far the only solution I have seen is a rotary converter
> (motor-generator) for 1-phase to 3-phase conversion.
> cheers,
> Nick K4NYW