TB 9-4931-488-35
(3) Set measuring receiver to measure peak AM with 50 Hz high-pass and 15 kHz
low-pass filters. Adjust %AM A26A2R19 (fig. 2) for a 50.0 0.1% measuring receiver
indication (R).
(4) Set AM and RF OFF/ON switches to OFF and repeat a above.
16. AM Sensitivity, Accuracy,
Distortion, and
Demodulated Output
(Models
Containing Option 004)
a. Performance Check
(2) Position controls as listed in (a) through (m) 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 FREQUENCY MHz display indication of
500 MHz.
(j) OUTPUT LEVEL 10 dB switch to +10 dBm.
(k) OUTPUT LEVEL 1 dB switch to 0 dBm.
(l) OUTPUT LEVEL vernier control fully cw.
(m) RF OFF/ON switch to ON.
(3) Set measuring receiver to measure AM with peak + detector. Set high-pass filter
to 50 Hz and low-pass filter to 15 kHz.
(4) Adjust 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 0.827-V level. The measuring
receiver will indicate between min and max limits listed in table 22; if not, perform b below.
(6) Repeat technique of (5) above for audio analyzer output levels listed in table 22.
The measuring receiver will indicate as specified; if not, perform b below.