MODEL 8559A
ADJUSTMENTS
ADJUSTMENTS
5
-
26.
SECOND CONVERTER ADJUSTMENTS (Cont'd)
THESE POINTS SHOULD BE AT
SAME AMPLITUDE
WITH BANDPASS
>17
MHz WIDE
1
dB DOWN AS SHOWN
r
-
3.75 DIV
1
+3.75 DIV
THESE POINTS SHOULD BE AT
SAME AMPLITUDE LEVEL
k0.4
dB
7
ALTERNATE
IF
.
REGULAR
IF
a.
TYPICAL BANDPASS RESPONSE
b.
COMPOSITE PHOTO SHOWING LOCATION
OF IF SIGNALS
C
.
ROLL
-
OFF AT HIGH
-
END OF RESPONSE
d.
ROLL
-
OFF AT LOW
-
END OF RESPONSE
AF1 AND AF2 MUST BE
21
MHz BUT
S4
MHz
AF1 MUST EQUAL AF2
20.2
MHz
FIGURE 5
-
13.
FIRST IF
BANDPASS FILTER RESPONSE