TM 11-6625-2629-14&P
facilities. If standby operation is necessary, set
(3) Switch the TUNE-FINE TUNE switch to
the DEVIATION RANGE KC switch to 1000
the FINE TUNE position.
TUNE and leave the POWER switch ON.
(4) Rotate the TUNING knob until the
CARRIER SHIFT meter again indicates zero.
3-6. Procedures for Shutdown
The FREQUENCY-MC dial now indicates the
Stop the modulation meter as follows:
carrier resting frequency of the input signal.
a. Set the DEVIATION RANGE-KC switch to
NOTE
the 1000 TUNE position.
If necessary, adjust the signal generator
b. Set the TUNE-FINE TUNE switch to the
o u t p u t or vary t h e coupling when
TUNE position.
measuring a transmitter.
c. Set the POWER switch to OFF.
(5) Check the LIMITING meter to be sure
3-7. Preparation for Movement
that it indicates in the black area.
The modulation meter is provided with a transit
NOTE
case to contain and protect the unit and its ac-
Usually signal generators can be con-
cessories. If the modulation meter is used as a
nected direct to the INPUT connector if
reck-mounted teat equipment, proceed as follows;
their level is relatively low. When the
i f used as a free-standing test equipment,
d e v i a t i o n of an fm transmitter is
disregard steps c and d
measured, loosely couple the output of
a. Disconnect any test leads (that may be
the transmitter to the INPUT jack of the
connected to AUOIO OUTPUT binding posts or
modulation meter with a pickup coil of a
INPUT connector).
few turns.
b. Disconnect the main power plug.
(6) Apply modulation to the carrier.
c. Remove eight screws that secure the
(7) Rotate the DEVIATION RANGE-KC
s w i t c h without pegging t h e meter. The
modulation meter to the equipment rack.
CAUTION
DEVIATION meter now indicates the deviation
of the carrier from its resting frequency due to
Support the back of the modulation meter
modulation. If the 1000-TUNE position is used,
when the screws are removed; the unit
m u l t i p l y the 0 - 1 0 0 scale reading on the
weighs 57 pounds.
DEVIATION meter by 10.
d. Withdraw the modulation meter from the
equipment rack.
(8) If my shift in the resting frequency has
e. Slide the modulation meter into the transit
taken place due to the modulation, the amount of
case, face of the modulation meter toward the
shift will be indicated on the CARRIER SHIFT
meter.
case opening.
f. Plug the power connector into PLUG
(9) The AUDIO OUTPUT jacks can be used
f o r audio monitoring of the input signal
STORAGE ONLY receptacle (on the face of the
modulation. With a spectrum analyzer connected
modulation meter) and coil the power wire be-
to the AUDIO OUTPUT jack, distortion of input
tween the ttransit case and the equipment.
signal modulation can be measured. The output
g. Place the transit case cover in place and snap
level can be varied by adjusting the AUDIO ADJ
closed the eight fasteners that secure the lid to the
control.
case. The modulation is prepared for movement
unless shipment is involved (fig. 2-1).
3-5. Procedure for Placing Equipment in Standby
Condition
The modulation meter does not employ standby
3-3
