Section II. OPERATION UNDER USUAL CONDITIONS

TM 11-5865-215-13

Section II.

OPERATION UNDER USUAL CONDITIONS

General.

There are five receiver control operating modes: self-test, manual

control, programmed control, programmed auto-step control, and auto-

sweep (tuning) control. These modes are described in the following

paragraphs.

Operating Procedures.

a. Self-Test Mode. The operator may activate the self-test mode

by pressing the keyboard decimal point (.) key three times. The self-

test function is stopped by pressing the CLR key. Successful execu-

tion of the self-test sequence verifies that the receiver control is

functioning normally. This sequence is illustrated in the test flow-

chart shown in figure FO-2.

b. Manual Control Mode. When in the manual control mode, the op-

erator may select a receiver tuning frequency by using keyboard nu-

meric(s) or the MANUAL TUNING control. In addition, the operator may

select various receiver operating commands by pressing the appropriate

RECEIVER FUNCTIONS key. The MAN TUNE key lights to indicate that the

operator may tune the receiver by using the MANUAL TUNING control.

This method is used when in the AUTO SWEEP or AUTO STEP mode and the

HOLD key is lit, or when the MAN TUNE key is lit and other modes are

not active. Keyboard and nonkeyboard manual control modes are de-

scribed below.

( 1 ) Manual ( keyboard) control.

(a) Select desired frequency by using keyboard numerics

(0 thru 9) and decimal point, (.). The frequency selec-

tion is presented on the TUNING FREQUENCY (MHZ) display.

NOTE

Floating point decimal operation may be used, but is

not necessary if the tuning entries contain leading

zeros for all frequencies under 100 MHz.

(b) Select receiver operating commands by pressing appropriate

RECEIVER FUNCTIONS keys (selected RECEIVER FUNCTIONS keys

will light).

( c ) Press TUNE RECEIVER. Observe that TUNE RECEIVER key is

lit, indicating displayed tuning frequency (on FREQUENCY

(MHZ ) display) , and that operating commands are being

transferred to receiver (lit RECEIVER FUNCTIONS keys).