UHF connectors (PL connectors ) were invented in the 1930s as an engineer company Amphenol - Clark Kveykenbushem . Abbreviation stands for UHF "Ultra High Frequency" ( at the time of invention UHF connectors , frequency 300 MHz was considered Ultra High Frequency ) . Originally intended for UHF connector video radar, are now widely used in amateur radio . Ham radio is often called UHF connectors in accordance with military specification connectors PL PL- 259 (Plug, Male, fork ) and SO- 239 (Socket. Female. Rosette ) . UHF PL- 259 interface can be used with larger diameter coaxial cables , for example , RG- 8, RG- 213 and a smaller diameter RG- 58 , RG- 59 , RG- 174 , 5D-FB.