<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2015) (Learn how and when to remove this template message) </Td> </Tr> <Table> UHF connector <Tr> <Td_colspan="4"> PL - 259 (male) plug . Outside diameter is about 18 mm . </Td> </Tr> <Tr> <Th> Type </Th> <Td_colspan="3"> RF coaxial connector </Td> </Tr> <Tr> <Th_colspan="4"> Production history </Th> </Tr> <Tr> <Th> Designer </Th> <Td_colspan="3"> E. Clarke Quackenbush </Td> </Tr> <Tr> <Th> Designed </Th> <Td_colspan="3"> 1930s </Td> </Tr> <Tr> <Th> Manufacturer </Th> <Td_colspan="3"> Various </Td> </Tr> <Tr> <Th_colspan="4"> General specifications </Th> </Tr> <Tr> <Th> Diameter </Th> <Td_colspan="3"> 18 mm (0.71 in) (typical) </Td> </Tr> <Tr> <Th> Cable </Th> <Td_colspan="3"> Coaxial </Td> </Tr> <Tr> <Th> Passband </Th> <Td_colspan="3"> Typically 0--100 MHz </Td> </Tr> <Tr> <Th> Connector </Th> <Td_colspan="3"> SO - 239 (socket) PL - 259 (plug) </Td> </Tr> </Table>

What is the difference between pl-259 and so-239