https://www.dxzone.com/dx27723/spid-elektronick-rotors.html
SPID Elektronick Rotors - Manufacturers/Antenna Rotators | The DXZone
Rotors and rotor controllers for amateur radio polish manufacturer.
antenna rotatorsthe dxzonespidrotorsmanufacturers
https://www.rfcafe.com/references/radio-electronics/antenna-rotators-radio-electronics-april-1968.htm
Antenna Rotators, April 1968 Radio-Electronics - RF Cafe
Effect of raising the overall noise floor and/or generating intermodulation products can degrade the intended signal significantly enough to bugger audio...
antenna rotatorsaprilradioelectronicsrf