TB 9-6625-2343-40
(19) Press TI keys as listed in (a) and (b) below:
(a) DATA MHz.
(b) MEASUREMENT FM.
(20) Adjust calibrator level for a TI indication of 400 kHz.
(21) Switch TI DETECTOR between PEAK+ and PEAK- and note the difference
between the two indications.
(22) Adjust A18R23 FM DIST 1.5 MHz IF (fig. 4) for equal indications between TI
PEAK+ and PEAK-(R).
R23 FM DIST
R19 INC AM
1.5 MHZ IF
1.5 MHZ IF
FM DISTORTION AND
INCIDENTAL AM
1.5 MHZ IF.
Figure 4. A18 board.
(23) Press TI keys as listed in (a) and (b) below:
(a) DATA 3000.
(b) DATA kHz.
(24) Switch TI DETECTOR between PEAK+ and PEAK-. The difference should be
<1.6 kHz. If not, adjust A18R23 FM DIST 1.5 MHz IF (fig. 4) to reduce the difference by
one-half. Note the indications as PK1+ and PK1-.
(25) Press TI kHz key.
(26) Switch TI DETECTOR between PEAK+ and PEAK-. Note the indications as
PK2+ and PK2-.
(27) TI is properly adjusted when [(PK1+ - PK1-) + (PK2+ - PK2-)] <1.6 kHz.
(28) Move connection from AM/FM test source FM OUTPUT to AM/FM test source
FM/4 OUTPUT.
(29) Press TI keys as listed in (a) and (b) below:
(a) LP FILTER 3 kHz.
(b) AUTOMATIC OPERATION.
(30) Set calibrator for a wideband output of 1 kHz at an amplitude of 250 mV.
(31) Adjust calibrator output level for a TI indication of 50 kHz.
(32) Press TI MEASUREMENT AM key.
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