multitude of active devices fig4 illustrates a multi mode active circuit control system consisting of a multi mode signal conditioner 22 connected to a transceiver 21 using multiple cables 25 a single transmission line 26 connects the multi mode signal conditioner to the tuning decoder 23 which in turn is connected to multiple active components 24 over multiple cables fig5 illustrates a multi mode active circuit control and activation system having a transceiver 30 connected to a multi mode signal conditioner 31 using multiple cables to inject radiofrequency rf and pulse width modulated pwm signals into the signal conditioner the resultant waveform herein referred to as a u201c combined signal u201d is generated from the signal conditioner and is communicated over the transmission line 32 connected to a tuning decoder 33 the tuning decoder generates supply and control signals from the combined signal and supplies these signals to the various active components 34 fig6 illustrates a typical application of this technique where rf and pwm signals are generated in a transceiver 40 and combined using an rf choke circuit 41 and injected into a transmission line 42 at the other end of the transmission line the rf and pwm signals are separated using a second rf choke circuit and supplied to an active antenna assembly 44 with the rf signal supplied to the feed port of the antenna and the pwm signal converted to supply and control signals by the tuning decoder 43 for communicating with the active components of the tunable antenna resulting in multiple tunable.