CHECKOUT PRIOR TO USE

TM 9-1375-213-12-3

TO 11A20-15-1

NOTE

CAUTION

FINGER TIGHTEN THE SCREW, DO

The transmitter antenna wire MUST

NOT USE A SCREWDRIVER (OVER-

be set up vertically. Laying it out on

TIGHTENING COULD DAMAGE

the ground(as can be done with the

will drastically

THE ANTENNA).

receiver

reduce the unit's range.

(6) While holding the antenna in posi-

tion, hand turn the captive screw clockwise

(d) If the RF connector is to be

used, use a flat tip screwdriver or screwdriver

until it engages and secures the antenna.

blade of demolition kit knife to loosen captive

b. Improvising a Replacement Antenna. If

screw at base of carrying handle/antenna hous-

ing. Pull out the remains of the original

the transmitter's antenna becomes badly dam-

aged and a replacement is not available, take

antenna. Do not discard the antenna if there is

the following action:

any hope of repairing it.

(e) Connect the antenna wire to

(1) If the damage is above the anten-

the transmitter as follows:

na's coil and there is at least a foot of antenna

left (even if it's bent or crushed), the transmit-

1. By use of the RF connector

ter may still be used but its range will be

Without the full length of antenna

(fig. 3-5 a).

above the coil, the range should still be at least

2. Secure the antenna's clip

half the normally expected range of a complete

or clamp to the remains of the antenna

antenna.

BELOW the coil (fig. 3-5 b.)

(2) If the coil is damaged, loosened, or

removed from the antenna or if there is less

3. Tie the stripped end of the

antenna wire tightly around the remains of the

than a foot of antenna left above the coil, a sub-

antenna BELOW the coil. Tape or tie with a

stitute antenna must be rigged:

string to assure a good contact (fig. 3-5 c.)

(a) Obtain a 10 foot length of insu-

lated wire (similar to the receiver's antenna,

para 2-3b). If the proper radio frequency (RF)

connector (NSN 5935-00-166-6281 or 5935-00-

470-2813) is available, solder the conductor to

Methods 2 and 3 above will reduce the

the center contact of the RF connector.

effective range or the transmitter.

Remove the protective cap from the auxiliary

antenna connector (fig. 1-2).. Secure the RF con-

nector to the auxiliary antenna connector. A

push-twist motion is required to do so.

CHECKOUT PRIOR TO USE

3-9.

Disconnect the RF connector after assuring it

works properly. If this is done, skip step (b)

should

to step (c) If the RF connector is

a. General. Checkout procedures

below and

not available and if possible, obtain an alligator

be undertaken at the following time:

clip or a similar electrical clamp suitable for

grasping the antenna below the coil.

(1) As soon after issue as practicable.

(2) Prior to any mission when the

(b) Strip half an inch of insulation

M122 components have been in storage or other-

from one end of the wire and secure the clip or

wise inactive for more than a few days.

clamp to the wire. If no clip or clamp is avail-

able, strip about four inches of insulation from

one end of the wire.

(3) After dropping or impacting the

units.

tion, secure the wire in a vertical attitude,

(4) After cleaning a battery compart-

ment that has battery leakage or corrosion on

stripped end down. Take or tie the antenna in

position with string or-similar item, not wire.

its battery contacts or when a mercury battery

is being used in the receiver.

Do not tie the antenna wire itself around any-

thing since this will effectively shorten the

antenna and reduce the operational range.

(5) Prior to ALL missions where time

and circumstances permit conducting the test.

This will give added assurance of mission suc-

cess.

3-7