OCR Text |
Show 1 SUMMER POOR TIME FOR RADIO OPERATORS I Expert Shows Why Winter Is Best for Wireless Fans BY PAUL F. GODL.EY America's Foremost Radio Authority. Dog days are poor dnys for radio reception The best results are obtained during dur-ing the winter months This fact is Illustrated graphical!) In the chart which shows the strength of signals received at Washington from Philadelphia (represented bv the dotted dot-ted line- and Norfolk (solid line), lo ci id respectively at distances of 110 and 150 miles. These curves were, recorded ocer a I period of approximately two year- and give s fair idea of the relative strength ol reception from month to month. Both of these stations were operating oper-ating on a wave length of 1000 meters. Had they used a shorter length. 360 'meters for example, tho variation In signal strength would have been considerably con-siderably greater MORE STATIC Xot only are the signals weaker during dur-ing the summer months than during the winter but the amount of Interference Inter-ference due to natural causes (statk is grcath Increased. Radio cannot fully come Into Its i I I I I t T I I I I I 1 1 I I I I I 1 I I l fJ-- ZZZJ 1 7T 35 C 2o ' V- i o. A V yy o - o ol I I I I I I 1 I I I I I I I I I I I I I I I I I SIGNALS FROM "PHIL ADC LTHIA SI6NA15 rPOtv NORFOLK sfiTRENGTH (I SIGNALS RECEIVED AT WASHINGTON ,')V. n until some means of counteroct-inp counteroct-inp or otfsetiing these natural effects have been devised On the shorter wave lengths The rise and fall of elgnal strength Is also very marked at nunset and sunrise. During the night, the absorption of the electrical energies cauaed by the sunlight sun-light are absent and, depending on several sev-eral other factors, extremely small signal energies may penetrato to great distances. This effect Is most noticeable during dur-ing ttye winter Even during the daytime In cold weather, particularly If It happens to be dark, signals from small stations have been received at great distances BEST RKSUITS. The best results are recorded be-twsen be-twsen 4 SO p. m. and 8:30 a m during dur-ing the winter. Winter nighitime conditions re responsible re-sponsible for the record-breaking reception re-ception of low-power stations at great distances. Vmru-ic.-in ,-7T)Hteurs spanned thi Atlantic durine Pec-ember British naval e"SSels off the coasts of Australia heard a low-power tele-j phone station on the Pacific coast last winter. But dog days are hot days. And reception Is comparatively poor. |