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MIL-T-28732 Revision C, April 6, 1984
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TRANSFORMER, IMPEDANCE MATCHING, BALANCE TO UNBALANCE (BALUN)
Includes all amendments and changes through Validation Notice 2, August 25, 2011
Additional Comments: INACTIVE FOR NEW DESIGN
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This specification covers the requirements and tests for the production of the impedance matching, balanced to unbalanced (balun) transformer, hereinafter referred to as the transformer. The transformer provides efficient transfer of high power radio frequency (RF) energy in the high frequency (HF) range (2 megahertz (MHz) to 30 MHz) between an unbalanced concentric 50-ohm (coaxial) transmission line and a balanced antenna.

The transformer shall be of the following types and power ratings, as specified (see 6.2).
       Type I    -  50 ohms primary impedance unbalanced, 200 ohms secondary impedance balanced
       Type II   -  50 ohms primary impedance unbalanced, 300 ohms secondary impedance balanced
       Type III  -  50 ohms primary impedance unbalanced, 600 ohms secondary impedance balanced
       Power 1   -  1.0 kilowatt (kw) average, 2 kw peak envelope power (PEP)
       Power 2.5 -  2.5 kw average, 5 kw PEP
       Power 5   -  5.0 kw average, 10 kw PEP
       Power 7.5 -  7.5 kw average, 15 kw PEP
       Power 10  -  10 kw average, 20 kw PEP
       Power 20  -  20 kw average, 40 kw PEP
       Power 25  -  25 kw average, 50 kw PEP
       Power 50  -  50 kw average, 100 kw PEP