panel.
(6) Connect video cable between SYNC
(3) From counterclockwise, OFF, position,
OUT connector and external equipment, if desired.
F
External Pulse Modulation.
slowly adjust FM AMPLITUDE control clockwise for
(1) Set MOD. SELECTOR switch to EXT
(4) Connect rf cable between RF
+ or EXT -, as required by the polarity of the external
OUTPUT con- nector and load. No output synchronizing
modulating pulse to be used.
pulses are available from the unit under these conditions.
(2) Connect external modulation pulse
h. Instrument
Readings
and
Indicator
voltage, with an amplitude of at least 15 volts, to EXT
Presenta- tions. Indicator presentations are conventional
MOD. connector on the front panel. (See tabulated data
for permissible range of characteristics of pulses to be
and depend on the operation to which the equipment is
employed.)
being used for each instance. In normal operation, the
(3) Other controls are inoperative and may
re- main in any position.
(4) Connect rf cable between RF
OUTPUT con nector and load. No synchronizing pulses
3-6.
Turnoff Procedure
are available from the unit under these conditions.
Regardless of the positions of the other controls, place
power ON-OFF switch in the OFF position to remove
(1) Set MOD SELECTOR switch to EXT
power from all electrical circuits and apply power to the
FM position.
space heaters. To completely remove power from the
(2) Connect external modulation voltage
instrument, disconnect power cable.
Section III. OPERATION UNDER UNUSUAL CONDITIONS
areas is the large amount of sand and dust that lodges in
3-7.
Operation in Arctic Climates
the moving parts and mechanical assemblies. Clean-
Subzero temperatures and climatic conditions as-
ing and servicing intervals shall be shortened accord- ing
sociated with cold weather may hamper the efficient
to local conditions.
operation of electronic equipment. Instructions and
precautions for operation under such conditions follow:
a. Keep the equipment warm and dry. If the
3-9.
Operation in Tropical Climates
In tropical climates, electronic equipment may be in-
equipment is not kept in a heated enclosure, construct
stalled in tents, huts, or when necessary, in under-
an insulated box for its protection.
b. Make certain the equipment has been
ground dugouts. When equipment is installed below
ground, and when it is set up in swamp areas, danger of
warmed up sufficiently before use. The solid state
moisture damage is more acute than normal in the
components may need a few minutes depending upon
tropics. Ventilation is usually very poor, and the rela-
the tempera- ture of the surrounding air.
c. When equipment which has been exposed
equipment whenever its temperature becomes lower
to the cold is brought into a warm room, it will sweat until
than the ambient air. To counteract this condition, place
it reaches room temperature. When the equipment has
lighted electric bulbs under the equipment.
reached room temperature, dry it thoroughly.
3-8.
Operation in Desert Climates
The main problem with electronic equipment in desert
3-8