high frequency signals and power carried in a main cable delivering the same to a device are insured continuance flow within the main cable through use of a shorting bypass bar assembly in the device that is activated to electrically connect input and output ports of the device whenever the cover of the device is removed for servicing , for insuring continuity of the signal and power flow through the main cable . the shorting bypass bar itself is electrically connected to ground whenever the cover of the device is installed and the shorting bypass bar is disabled . also , printed circuit board connectors for coupling to the input and output ports of the device to conduct signals from the input port into a pcb board for processing , and for delivering signals and power back into the main cable from another pcb board connector , include rf shielding , and the minimization of the size of the electrically interconnecting components both on the pcb connectors , and on the shorting bypass bar for maintaining a 75 ohm impedance at all times for electrical signals having frequencies ranging from less than to at least 3 ghz .