MODEL 8559A

ADJUSTMENTS

ADJUSTMENTS

5-26. SECOND CONVERTER ADJUSTMENTS(Cont'd)

THESE POINTS SHOULD BE A T

SAME AMPLITUDE WITH BANDPASS >17 MHz WIDE 1 dB DOWN AS SHOWN

 

 

THESE POINTS SHOULD BE A T

 

 

 

SAME AMPLITUDE LEVEL k0.4 dB

.

 

 

 

7

 

r

 

1

ALTERNATE

REGULAR

-3.75 DIV

+3.75 DIV

 

I F

I F

a. TYPICAL BANDPASS RESPONSE

b. COMPOSITE PHOTO SHOWING LOCATION

 

OF I F SIGNALS

C. ROLL-OFF A T HIGH-END OF RESPONSE

d. ROLL-OFF A T LOW-END OF RESPONSE

AF1 AND AF2 MUST BE 21MHz BUT S4 MHz

AF1 MUST EQUAL AF2 20.2 MHz

FIGURE5-13. FIRST IF BANDPASSFILTER RESPONSE