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This is a variety of Amidon material which I used for testing, for power combiners or splitters as well as for Low Pass Filters and Antenna Baluns and for transformers - the gray types on the left are material 43 and 61, preferred for broad bandwidth transformers. The "big buddies" are used for High-Power-Applications (>5KW) and up to about 10 MHz. Generally "red, type 2" is good from 160m up to 30m - from 10 MHz up to 50 MHz you better go for yellow, type 6...

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