V. G. ELLERBRUCH, F. C. FITCHEN AND R. W. SAWREY 
1117 
'200 
Case II- 
190 
Case I 
160 
l50 
Figure 13. — FM modulator using AR or AX. 
semiconductor devices. M.S. thesis, South Dakota 
State University, pp. 52-66, 126-129, 1970. 
6. Dypre, J. and Bodway, George. The application of 
scattering parameters to high frequency circuit 
design. IEEE Intntl Conv. Digest, New York, 1970. 
DISCUSSION 
Questioner (unidentified) : You mentioned 
150 to 160 MHz. You were talking about crys- 
tals there, or were you talking about other 
transducers ? 
Dr. ELLERBRUCH : No, you see when I talked 
about that (Figure 13), I would take the crystal 
out. But with a crystal in that range on a 
seventh overtone, you can drive the crystal 
maybe 5, 10, 15 kHz. 
