Late 1980's RF component which was probably sourced from RFS Australia, which was formed from an amalgation of Antenna Engineering Australia & Hills Antenna Systems.
Radio Frequency Systems (RFS)
Coaxial Isolator/Circulator
Model CC460
Includes 2x end caps (Red)
Frequency range: 450 ~ 470MHz
Isolation: 20dB ~ 23dB
Insertion loss: 0.3 ~ 0.35 dB
Return loss: 20dB ~ 23dB
Maximum RF power handling 250 Watts
Dimensions: 63mm x 63mm x 33mm height
SUHNER N Connectors (Female) all ports
Clockwise circulation
Removed from a working communications installation due to upgrade
One thing I am not sure about, the topside of the case has 3x recessed slot screw heads (look to be brass). I strongly suspect these allow for the circulator to be "tuned", one adjustment for each port.
