All,
I am constructing a bi-directional coupler according to the notes in the
arrl antenna handbook. It calls for a couple of transformers to be
build. I have purchased Amadon 'red' cores. (I think perhaps Yellow
would have been a better choice.)
The local electronics store seems to have two different types of core
materials, one based on colors and a 2,3,4... series covering a
frequency range. The other has series numbers 43, 45, etc.
What are these two series used for?
What is the difference?
Within a frequency range do they functionally similarly?
Thanks in advance - Dan
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