TB 9-4931-527-40
7. Equipment Setup
Set LINE switch to ON and allow 30 minutes for warm-up.
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
8. Frequency Range
a. Performance Check
(1) Set TEST MODE switch to FM.
(2) Set measuring receiver to measure frequency and connect measuring receiver
sensor to TI FM OUTPUT.
(3) Rotate CARRIER FREQUENCY TUNE control from fully ccw through fully cw
while observing measuring receiver indications. If measuring receiver does not indicate
less than 352 MHz at low end and more than 432 MHz at high end, perform b below.
(4) Connect measuring receiver sensor to TI FM/4 OUTPUT.
(5) Repeat technique of (1) through (3) above for TI connections and switch positions
listed in table 3. Measuring receiver will indicate within limits specified.
Table 3. Frequency Range
Measuring receiver
Test instrument
indications (MHz)
TEST MODE
Connection
Maximum
Minimum
switch positions
(OUTPUT)
for ccw
for cw
FM/4
FM
88
108
AM, FM/32
FM
11
13.5
AM, FM/32
AM
11
13.5
b. Adjustments
(1) Connect multimeter to A1TP4 (fig. 1), and chassis ground.
(2) Set TEST MODE switch to AM and adjust CARRIER FREQUENCY TUNE
control for a -4.60 V dc indication on multimeter.
(3) Unsolder loop A1L3 (fig. 1) and slide it in or out until measuring receiver
indicates 400 MHz. Resolder loop A1L3 (fig. 1) (R).