At 04:50 PM 9/12/97 +0100, you wrote:
>What's the general feeling about toroidal dust iron cores in tank
>circuits? I know some manufacturers seem to use them just fine at the
>1500 watt level: I've always felt a bit dubious, but that may be just
>innate conservatism. I've used them at 100 watts OK in a professional
>transceiver, but what are the big ones like at 1500watts with up to
>2:1VSWR?
>
Alpha has been using them for years, Peter. The 77 series uses stacked
cores for 80 and 160 meters in the pi, as well as 20-160 meters in the L.
4500 watts is no problem, but it would take a third one in the stack for
more QRO. The are advantageous as they are self shielding and can be place
much closer to the chassis that an air-wound coil without degradation.
(((73)))
Phil, K5PC
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