Note
Ham Radio, Sep 1978, p. 108.
This broadband RF transformer will match vertical and mobile antennas to 50- ohm coaxial cable. Impedance values of 8, 12.5, 16, 22, 32, and 50 ohms
can be selected by a switch.
The transformer is mounted in a die-cast aluminum case and fitted with UHF (SO-239) connectors. The RF ferrite toroid core is wound with tefIon-insulated wire and is rated at 500 watts in continuous commercial service.
Operating frequency range is 1–30 MHz (1–10 MHz below 20 ohms).