TRAVELING WAVE TUBE FOR 6,000-MC RADIO RELAY 



1341 



150 



125 



I/) 



LU 100 

 CE 



a. 



o 

 o 



75 



50 



25 



-10 



-5 



5 10 



POWER INPUT IN DBM 



15 



20 



25 



Fig. 45 — Compression as a function of input level for two values of helix volt- 

 age. Triangles represent data obtained with the test set of Fig. 24. Circles and 

 squares represent data obtained by the two signal intermodulation measurement. 



in frequency and 30 db different in level. From measurements of signal 

 strength at the various frequencies involved, the magnitudes of S>\ and 

 *S2 were determined with the results shown in Fig. 44. From these re- 

 sults the values of c and h^ were calculated and then converted to % 

 compression and degrees per db in order to compare with the results of 



-15 



-10 



-5 



5 10 



POWER INPUT IN DBM 



15 



20 



25 



Fig. 46 — Conversioia of amplitude modulation to phase modulation as a func- 

 tion of input level for two values of heli.x voltage. Triangles represent data ob- 

 tained with the test set of Fig. 24. Circles and squares represent data obtained by 

 the two signal intermodulation measurement. 



