Orion Power Supply Common-Mode Choke

Installed an Amidon FT-240-77 ferrite toroid as a common-mode choke (11 turns) in the Orion's DC power supply cable and located about 18" from the Orion. I am using an Astron RS-35A linear power supply (the fan on the Ten-Tec switching PS was too noisy). The cable run between the power supply and the Orion is somewhat lengthy because the Orion is connected to an MFJ-1129 multi-outlet strip.
Wound on Amidon FT-240-77 ferrite toroide