Analog Circuits (cont)

TM 11-6625-2884-30/NAVAIR 16-35TS3615-2

RF MODULATION (Continued)

(12) PULSE SYNC is generated together with ADDRESS ADVANCE and is used to

sync the oscilloscope.

(13) BLANKING pulse is generated 100 ns prior to the leading edge of the

PULSE DRIVE signal and ends 600 ns after the trailing edge of PULSE

DRIVE. The pulse is available at Blanking Jack J6 to simulate the

blanking pulse supplied to LRU-1 from the aircraft.

(14) PULSE WIDTH SELECT SWITCH S4. This control is capable of setting the

width from 0.1 to 9.9 s in 0.1 s steps.

(15) PULSE DRIVE. The PRI generator produces a pulse train simulating radar

threats except when PRI select switch is in OFF. The pulse drive signal

enables Pin Switch CR2 to pulse modulate the RF signal.

(16) PULSE/CW SWITCH S1. In the pulse position, the pulse drive signal is

In the CW position the pulse drive signal is inhibited.

(17) NORMAL/PATTERN SWITCH S8. Selects either pulse sync or pattern sync to

sync the oscilloscope when performing maintenance on LRU-1.

2-28