Community aerial system of broadcast distribution

To provide a flat-colony with radio reception, a single aerial is erected outside the noise-cloud associated with the building. It can often be placed on the roof. A low-impedance transmission line connects it to an aperiodic amplifier, capable of supplying signal current to a hundred receivers. The amplifier is single-stage, and has ten valves (pentodes) connected in parallel. The anode and grid circuits are tuned, and their peaks are set to regular intervals throughout the frequency band to be covered. Anode circuit peaks are staggered between those of adjacent grid circuits to give a more even overall response. Six of the valves, and a seventh grid circuit, cover the medium waves. In these instances the valve capacity suffices to resonate with the external coil, giving the high step-up necessary to couple the low-impedance input to the valve grids, and conversely to couple the valve anodes to the output. The output is taken through shielded single-core rubber cable, looped-in to the receivers. Each receiver has a resistance (minimum 500 ohms) connected between each pole and line. The distribution problem is dealt with analytically.