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Radio Broadcast
acteristics of all these circuits have been very accurately measured so as to give filter curves suitable to the required speeds of working, and the adjustments are easily performed by the operators. Aside from the protection from interference given by directional reception, a close filtering, and an element of saturation, no particularly sensational methods or ideas in regard to static elimination have been so far introduced into practice.
WHERE STATIC COMES FROM
DURING my present journey across the Atlantic on board the Yacht Elettra, we noticed that up to about half way across (apart from the effects of local storms, static interference appeared to be coming mainly from the
European and African continents, while at more than half way across they were coming from westerly directions, that is, from the American continent.
The changing over of the direction of origin of these disturbances has also been noted under similar circumstances by Mr. Tremellen in crossing the Pacific.
The protection of receivers against the troubles of atmospherics or static can only be, and is likely to continue to be, a relative matter, as it is quite obvious that a static eliminator under certain conditions will cease to be effective, where the static arrives with much greater intensity than had been anticipated, and will also frequently fail when, in consequence of the weakness of the received signals, amplification
A very good idea of the receiving antenna may be had from this photo. The young man is demonstrating the effect of placing a tuned inductance between the transmitter and receiver. A shght movement to one side or the other permits the signal to be received, but when it is placed directly before the receiving antenna, signals are entirely cut off. If we are to have directional, short wave transmission it would seem as though both sending and receiving stations would have to be high enough to offset the possibility of any shielding objects coming between them. Operation in large cities would be quite difficult. The receiving rod is slightly shorter than the reflector rod because the former is connected to a circuit having a certain
amount of inductance
Courtesy Radio Corporation of America