Winding high power xmit toroids

[Chris Trask]

On Fri, 25 Jun 1999, Lane Zeitler wrote:

> I am beginning the process of winding some toroid coils that are going to be
> used in a 1500 watt hf amp. The cores are T-225 and are supposedly good for
> 1500 watts but I figure to be safe I will use two sandwiched together.
> Questions:
>
> 1. Do the two toroid cores need to be insulated from each other or can I
> just place them tightly next to each other and then wrap them as a package?
>
        Tightly together as a single toroid.

>
> 2. What is the best thing to use to hold them together as one piece? Some
> kind of fiberglass tape? Can I buy the stuff at Home Depot?
>
        Super-glue.

>
> 3. I am using teflon insulated wire. Do I need to insulate the cores before
> applying the wire?
>
        No.  You might consider using magnet wire instead.  The insulation
will handle the higher temperatures better.

>
> Any info greatly appreciated. This is my real first attempt at using toroid
> coils for 160, 80 and 40 meters instead of the regular air wound type a la'
> B & W style.
>
        Too bad that stuff is almost history now.

Chris


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