Two batteries BA-30 or BA-3030 or an external 3-volt DC source are required. The external
source must be connected to the battery (BAT) binding posts. (See Figure 1-2.)
Figure 1-2. Telephone set TA-312/PT, controls and indicators.
Installation. The telephone may be used as a desk phone, or it may be mounted vertically on a
tree, pole, or other support.
a. Use as a desk set. Unbuckle the carrying case retaining strap and remove the housing
assembly from the carrying case. Store the carrying case for later use. Place the telephone in a
convenient location on the desk.
b. Installation on a tree or pole. Unhook the end of the carrying strap on the BZ-23/PT end of
the carrying case. Adjust the carrying strap to a length equal to the distance around the support For a
thin support, adjust it to go two times around the support. Place the TA-312/PT against the support with
the LINE 1-2 binding posts at the top. Wrap the carrying strap around the support and secure the free
end to the upper ring on the carrying case. Wrap a length of WD-l( )/TT around the support and through
the lower loop of the carrying case; tie it securely in place.
c. Use a screwdriver to set the SELECTOR switch to the proper position for the service being
d. To connect the WD-1( )/TT. Strip approximately 1 inch of insulation from the ends of the
two wires in the line. Be sure the wire is clean of any residue. Fold back the stripped wires about one-
half inch from the end. Push down one of the LINE 1-2 binding posts. Insert the bare end of one wire
into the binding post slot and release the post. Check to see that the wire is securely clamped. Repeat
the procedure with the other wire in the other post.