Description of Antenna AT-884/APX-44

12. Description of Mounting MT-2100/APX-44

10. Description of Control, Transponder

(fig. 5)

Set C-2714/APX-44

(fig. 3)

The mounting is installed on a flat sur-

f a c e within the aircraft. The mounting

a. T h e c o n t r o l u n i t i s a s e p a r a t e l y

consists of a flanged bed, a mountingbase,

housed unit consisting of an illuminated

four resilient mounts, two front holddown

p a n e l on which are mounted the trans-

c l a m p s , and an injector-ejector mecha-

ponder set operating controls. The panel

is illuminated by the panel lights. A U-

n i s m . Bonding between the flanged bed

and mounting base is accomplished with

s h a p e d c o v e r , attached with machine

f o u r flexible ground straps. A bracket,

screws, protects the component parts

within the assembly.

with a connector cutout, index pins, and

holddown pins are located on the rear of

b. Power and control cabling is con-

nected to the control unit through a multi-

mounting.

pin connector on the rear of the chassis.

The control unit mounts in a rack or in a

13. Additional Equipment Required

cutout in the instrument panel of the air-

The following equipment is not supplied

c r a f t . F o u r quick disconnect fasteners

as part of the transponder set but is needed

secure the front panel to the case.

for use with the set:

a . P o w e r S o u r c e . A 27.5-volt, direct-

11. Description of Antenna AT-884/APX-44

current (dc) power source is required to

(fig. 4)

supply power to the transponder set.

b . M i c r o p h o n e . The microphone is part

The antenna is a lightweight blade-type

of the aircraft installation. It is used for

a n t e n n a assembly that is mounted in a

cutout in the skin of the aircraft frame.

modulating radiotelephone equipment and

to control the position identification func-

The antenna is secured to the airframe with

six machine screws. A coaxial cable con-

tion of the transponder set.

nector on the base of the antenna is used

c. Headset. The headset is part of the

t o connect the antenna to the receiver-

aircraft installation. It is used for mon-

itoring the reply pulses transmitted by the

transmitter.

receiver-transmitter.

d. Cables. Two cables are required for

connecting the components of the trans-

ponder set:

Figure 3. Control, Transponder Set C-2714/APX-44.

Figure 4. Antenna AT-884/APX-44.