TB 9-4931-488-35
(2) Position controls as listed in (a) through (k) below.
(a)
COUNTER MODE INT EXT pushbutton pressed.
(b)
COUNTER MODE EXPAND X10 and X100 pushbuttons released.
(c)
COUNTER MODE LOCK ON pushbutton released.
(d)
AM X10% pushbutton pressed.
(e)
AM switch to DC.
(f)
AM control fully cw.
(g)
FM switch to OFF.
(h)
RANGE MHz switch to 512-256.
(i)
FREQUENCY TUNE control for a FREQUENCY MHz display indication of
500 MHz.
(j) OUTPUT LEVEL switch to +10 dBm and vernier control(s) fully cw.
(k) RF OFF/ON switch to ON.
(3) Set measuring receiver to acquire the frequency then to measure AM with peak
+ detector. Set high-pass filter to 50 Hz and low-pass filter to 15 kHz
(4) Set audio analyzer controls for a 1 kHz 600 Ω output frequency.
NOTE
In (5) and (8) below, record measuring receiver % AM display
indication using peak + detector and peak - detector. Average
the indications and use the average for determining the
results.
(5) Adjust audio analyzer output controls for a 1.272-V level. The measuring
receiver will indicate between min and max limits listed in table 19; if not, perform b below.
(6) Repeat technique of (5) above for audio analyzer output levels listed in table 19.
The measuring receiver will indicate as specified; if not, perform b below.
Table 19. AM Sensitivity
Audio analyzer
Measuring receiver
Output
Indications
levels
(% AM)
(V ac)
Min
Max
1.272
85.5
94.5
.9898
66.5
73.5
.707
47.5
52.5
.4242
28.5
31.5
.2828
19.0
21.0
.1414
9.5
10.5
(7) Adjust audio analyzer output controls for a 1.414-V level.
(8) Adjust AM control for 90 % modulation (9 on 0-10 scale) as indicated on TI
meter. The measuring receiver will indicate between min and max limits listed in table 20.
(9) Repeat technique of (8) for TI meter indications listed in table 20. The
modulation analyzer will indicate as specified.
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