ULTRA-SHORT'WA VE TRANSMISSION PHENOMENA 



199 



nificance to these observations as the superregenerative receiver is 

 fundamentally incapable of quantitative field strength indications. 



Further work was therefore undertaken using the double detection 

 field strength measuring set. The transmitter site was at first the same 



I 





Fig. la — Front view of measuring set. 



as for the preceding autumn, viz., the Holmdel Laboratory where a 

 half-wave center-tapped antenna on a 65-foot (20-meter) pole was fed 

 with a simple parallel wire transmission line of No. 14 B & S gauge 

 tinned copper wire, 1/4-inch (0.635-centimeter) spacing, with 246 

 ohms characteristic impedance. With the antenna impedance equal 



