Chapter 3. FUNCTIONAL DESCRIPTION OF EQUIPMENT

TM 32-5865-21624&P

CHAPTER 3

FUNCTIONAL DESCRIPTION OF EQUIPMENT

Section I.

GENERAL

SCOPE .

3-1.

This chapter provides a functional description of the tunable

The circuits are explained to the extent necessary for

coupler.

general support maintenance.

ORGANIZATION .

3-2.

In addition to the functional description contained herein,

refer to TM 32586501210 for operating instructions for the tunable

The following description references block diagrams, an

coupler.

interconnection diagram, and schematic diagrams. Block diagrams are

The interconnection

provided in the text or as foldout drawings.

diagram and schematic diagrams are provided as foldout drawings.

Foldout drawings referenced in the text as FOs are located at the

rear of the manual.

LOGIC TERMINOLOGY.

3-3.

This paragraph provides information that applies to the

following functional description.

Logic input/output voltage levels are:

33.1 Logic Levels.

High (true) = +2.4 to 5.5 V dc

Low (false) = 0.0 to +0.4 V dc

33.2 Signal Names. Signal names describe the function performed by

the signal. A signal name with an overbar is read with the prefix

NOT . For example, RESET is read NOT RESET.

If RESET is low (zero

(0) or false), the opposite (RESET) is assumed to be high (one (1) or

true) .

FUNCTIONAL DESCRIPTION

Section II.

TUNABLE COUPLER.

3-4.

Refer to figure 3-1.

The tunable coupler contains separate

control, status, and power distribution circuits. As shown in figure

FO1, motherboard A7 provides interconnections between RF relays K1

and K2, RF switch assembly S2, stepper motor Ml, and the following

circuit card assemblies (CCAs):

Decoder CCA A4

Control logic CCA A3

3-1