Hi Rik,
One T200_2 is enough for that power. I tried it on 160m at 1000w.
Temperature was abaout 40C.
Hpe cu on 630
Df5qg
Christian Groeger
Rik Strobbe <[email protected]> schrieb:
>Dear all,
>
>
>
>I intend to replace the air coils in the LPF on my 475 kHz transmitter by
>toroid core coils. I have a stock of T200-2 cores but for the power level want
>to get (500W would be required to get near the 5 W EIRP limit) one T200-2 is
>just on the edge in regard with the maximum flux (and thus temperature rise.
>
>To be on the save side I would use 2 T200-2 toroids for each coil, and there
>are 2 options:
>
>
>
>1. Glue 2 cores together to make one core of the double height.
>
>This would reduce the flux to 70%, well under the limit. It would also reduce
>the number of windings to 70%, but due to the double coil height the wire
>length will increase slightly (abt. 10%).
>
>But as the cores have rounded egdes there wil be some air space between the
>wire an the core, what might increase loss.
>
>
>
>2. Put 2 toroid core coils, each of half the inductance, in series.
>
>This will also reduce the flux to 70%, but the total wire length needed will
>increase by abt. 40%.
>
>
>
>In option 1 I will need lees wire (= less loss) compared to option 1, but the
>air space might undo this advantage.
>
>
>
>So my question is: what will be best?
>
>All advice is welcome.
>
>
>
>73, Rik ON7YD - OR7T
>
>
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