TM 5-6675-348-13&P
(6)
Loosen leg clamp (7) and remove each
extension foot (8).
(7)
Insert extension foot (8) into tripod
legs (9), with steps on tripod legs (9)
facing outward.
(8)
Tighten leg clamps (7).
b. Operation.
NOTE
The recommended working range
for the 1145-2 Laser Transmitter is
1000 ft (305 m).
The area encompassed by this
sweep of laser beam is 72 acres
(29 hectares). In flat fields, the
center of the field is usually the best
location. In rolling fields, locate the
1145-2 Laser Transmitter at an
elevation so the receiver can pick up
the plane of light approximately
midway in its receiver (or survey
rod) travel.
(1)
Select a location to utilize the 1145-2 Laser Transmitter.
NOTE
Consistent results with the 1145-2 Laser Transmitter require that the plane of light
remains stable. For this reason, the 1145-2 Laser Transmitter, the base, and the legs are
all carefully designed to use heavy components and special materials to minimize any
tendency to vibrate or drift.
When setting up the tripod assembly, it is important to obtain the most level and stable
base possible for the 1145-2 Laser Transmitter. The less the self-leveling mechanisms
have to work, the more stable the plane of light will be. Ground vibration, wind, or
extreme temperatures can influence the plane of light.
Ground vibration can be a problem in certain soils when working at long range from the
transmitting unit. Peat or muck readily conducts traffic vibration to the tripod legs. A
simple test is to stand next to the tripod assembly while heavy traffic passes. If you can
feel traffic vibration in your feet and legs, you may have a problem at longer ranges
where the vibrational effect on the 1145-2 Laser Transmitter will be magnified. Select
your site for the tripod assembly carefully.
(2)
Position Elevating Base and Tripod assembly with elevating base quick-release pointing upwind
and elevating base as vertical as possible.
5-22
