302 BELL SYSTEM TECHNICAL JOURNAL 



after proper development, are analyzed electrically, making possible a 

 complete analysis on the ground and thereby reducing materially the time 

 devoted to flight test, and also simplifying the process of analysis of complex 

 wave forms. 



Ultra-Short-W ave Transmitter for the Cape Charles-Norfolk Multiplex 

 System.^ R. J. Kircher and R. W. Friis. Design features of an unat- 

 tended ultra-short-wave double-sideband multiplex transmitter are de- 

 scribed. Forty decibels of envelope feedback is utilized over the 12- to 

 60-kilocycle band of the twelve type-K carrier-signal channels which 

 modulate the last stage of the transmitter. Accessibility of apparatus 

 and ease in maintenance contribute toward obtaining maximum reliability 

 of the equipment in commercial service. 



Paper Capacitors Containing Chlorinated Impregnants. Stabilization 

 by Anthraquinone? D. A. McLean and L. Egerton. This paper shows 

 anthraquinone to be an effective stabilizer for capcitors having paper di- 

 electrics containing chlorinated impregnants when aluminum electrodes are 

 used and d-c. potentials are applied. One half per cent of anthraquinone 

 prevents formation of the usual carbonized brown spots in the paper, and 

 diminishes corrosion of electrodes and instability of leakage current. It 

 increases the life under accelerated testing conditions by factors of four to 

 one hundred fold, depending upon materials used and conditions of test. 

 This development has added appreciably to the reliability of paper capacitors 

 containing chlorinated impregnants, particularly for military equipment 

 where high temperatures and high voltages are often encountered simulta- 

 neously. Solubility of anthraquinone in the usual chlorinated impregnants 

 is Umited. Where greater solubility is desired, the more soluble chloro 

 and methyl derivatives can be used. 



Reflex Oscillators.^ J. R. Pierce. This paper discusses qualitatively 

 the behavior of reflex oscillators. Power production, electronic tuning, 

 variation of frequency with resonator voltage, effect of modulation coeffi- 

 cient, and influence of load are considered. Two brief mathematical appen- 

 dixes are included. 



Cape Charles-Norfolk Ultra-Short-Wave Multiplex System.^ N. F. 

 ScHLAACK and A. C. Dickieson. This paper describes the general features 

 of a radio multiplex system which has been installed between Cape Charles 

 and Norfolk, Virginia. The radio-frequency equipment operates in the 

 vicinity of 160 megacycles. The system employs the 12 telephone channels 

 of the type K cable carrier system which are in the frequency range 12 to 

 60 kilocycles. 



^Proc. I. R. E., February 1945. 

 ''Indus, c^ Engg. Cliem., January 1945. 

 8 P;-oc. /. i?. £., February 1945. 

 ^Proc. I. R. E., February 1945. 



