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I50
RADIO BROADCAST
tube
Fig. II. Method of bringing lead-in into house
different direction to the broadcasting, their interference will be reduced.
The loop antenna does not pick up as much power as the conventional type of antenna, and unless the distance between the radio receiver and the broadcasting station is small, special apparatus involving high power radio frequency amplifiers is required.
In a frame house the lead-in may be brought into the room in which the receiver is placed by bringing it through a porcelain bushing in the wall of the house. In brick or concrete houses, the porcelain tube may be passed through a hole drilled in the window casing or a . board may be placed under the window sash, and a hole drilled in it to take the porcelain tube. This latter method is shown in Figure 1 1 .
The ground wire merits equal consideration
with the antenna. Although it is true that a ground on a water pipe in general cannot be bettered, yet in cases where it is necessary to run a long wire to a water pipe, better results may frequently be obtained in connecting to a steam or hot water radiator or even to a gas pipe. The ground wire should be as short as possible and should not be placed closely to the antenna wire. The antenna wire should never be taken into the building in the basement and brought to the radio set in close proximity to the ground wire. In fact the ground and antenna wires should be separated as widely as possible and both should be led in as direct a line as possible to their respective binding posts on the receiver.
This article on antennas would not be complete without some mention being made of lightning protection. Users of radio receiving sets and particularly landlords may rest assured that an antenna such as is erected for radio receiving is by no means as great a hazard as the telephone wires that can be seen running to any house. The radio antenna is hardly ever as long as the telephone connection between the house and the nearest pole and it is scarcely ever erected higher than a telephone line.
The Fire Underwriters Rules governing radio receiving antennas are now undergoing revision which will greatly simplify approval of small receiving installations by fire inspectors. Instead of the cumbersome knife switch that was formerly required, the use of a small enclosed gap in series with a wire to ground will be all that will be required, with the option of using a fuse to guard against possible contact between wires carrying high voltages and the antenna. There are now protective devices on the market which will doubtless be approved in the new revision of the code.
This article is not intended to create the im.pression that the installation of a radio receiving set is a difficult task. The thousands of successfully operating radio receivers bear evidence to the contrary. However, radio telephony reception like every other scientific phenomenon obeys certain laws. If these laws are not recognized, failure will result, but as long as they are appreciated and followed, radio telephony will be found to be one of man's most faithful servants.