[Antennas] DC voltage on coax

[William Lambing]

Use a series cap to isolate the DC from the radio and antenna.  Then feed/extract the DC with a series 1mh RF Choke that is applied after the cap to the radio.

ANT-----||----------------------||-------radio
                 |                        |
                 |                        |
               RFC                     RFC 
                 |                        |
                 |                        |
               Relay                   +Volts
                coil

Hope you get the idea.  We did this at Collins years ago on a CATV/FDM Telephone system on RG-59 Coax.

73

Bill, W0LPQ