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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Delta-Wye Conversions

These equations are used to transform a delta-connected set of resistances to a wye-connected (Y-connected) set of resistances.

Delta transformer winding drawing <===> Wye Y transformer winding drawing

R1 =	Rb·Rc Ra + Rb + Rc

R2 =	Ra·Rc Ra + Rb + Rc

R3 =	Ra·Rb Ra + Rb + Rc

Ra =	R1·R2 + R2·R3 + R3·R1 R1

Rb =	R1·R2 + R2·R3 + R3·R1 R2

Rc =	R1·R2 + R2·R3 + R3·R1 R3

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