On 5/31/2010 4:32 PM, Bill, W6WRT wrote:
> ORIGINAL MESSAGE:
>> Another option is bridging the 120V loads across the two halves of the 240V
>> plate
>> transformer's primary. I've seen this done with fans, etc. The primary acts
>> as an
>> autotransformer to provide half voltage. Then I could use a simple 3-wire
>> hookup.
> The second option is more problematical. The transformer will function
> as an autotransformer like you suggest, but the question is how good
> the regulation would be as the loads are varied. You will have two
> loads which vary: The screen supply on the primary side, and the plate
> load on the secondary side. Both will affect the other and both will
> be affected by resistance of the transformer windings and the
> tightness of coupling between the primary and secondary. If the
> regulation is not good, that will have a bad effect on your heater
> voltage as well.
I've decided to use a 4-wire circuit, including a neutral for the 120v loads.
The
connectors are expensive and most of the local hardware stores didn't have the
4-conductor
cable for the line cord, but these difficulties have been surmounted.
I have lots of areas for experimentation in my project, so I think I'll do this
part
conventionally.
--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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