Antenna Coupler - HomeBrew Forum at eHam.net

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eHam.net Forum : HomeBrew : Antenna Coupler

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Antenna Coupler	Reply
by W9IPR on August 3, 2004	Mail this to a friend!
I have an antenna coupler made by Sunair Electronics model CU-110. It has a 14 volt motor operating a 10 position switch that tunes a long wire to 10 different frequencies. I am looking for a schematic that defines how the motor control operates. I have the control head with the 10 position channel switch also. I plan to modify the coupler to provide a 10 band vertical. I would appriciate any information anyone might have on this unit. W9IPR Tom Ruhlmann teruhlmann@sbcglobal.net

RE: Antenna Coupler	Reply
by WB6BYU on August 4, 2004	Mail this to a friend!
The motorized switch in the remote box will have (at least) one wafer dedicated to the control function. Basically the wafers are arranged so that the control box puts the motor drive voltage on one wire. The wafer in the remote box connects all contacts to the common wiper EXCEPT the contact selected: the motor rotates the switch until it reaches the contact matching the control box setting, which opens the circuit and stops the motor. At least this is a common implementation - your unit may have a different control mechanism, but generally similar. If you look carefully at the wafer wiring on both switches it should be clear how it works.

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