On Fri, 4 Mar 2005, Dennis Crawley wrote:

> A friend of mine has a problem at work.
>
> The power stage of an AM transmitter has a transformer build it as follows:
> With two "FAIR-RITE", 50 mm, toroides -put together- as the nucleus, it has
> 5 turns in the primary (7ohms imped.) and 15 turns in the secondary (63ohms
> imped.).
> The material is #61.(nickel zinc ferrite)(see http://www.fair-rite.com/)
> It transfers 1KW at 580Khz. The induction is 25 mT.
> It has good air flow.
>
> The problem:
> After 10 minutes of modulation the two nucleus brakes itself.
> He hasn't measure the temperature but he told me it not rises to much.
>
> I'll translate to him all the answers, suggestions, comments and questions.
>
> Thank you in advance.

If by modulation you mean standard AM then the power is almost 2kW peak 
for 1kW carrier power.

Peter
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