STATUS AND MONITORING - TM-11-6625-2884-300098

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

STATUS AND MONITORING

(Refer to figure FO-6.) Status Panel Assembly 1A2 has an RF path,moni-

2-7.

toring switch, status indicators and control switches relating to UUT status.

RF Path.

(1) The high RF power output from LRU-1 is reduced by a 30 dB RF power

attenuator installed at the RF output of LRU-1. The output of the

30 dB attenuator is coupled through RF IN Jack J2 at the front of

the status panel and then through two step attenuators.

(2) Attenuator AT1 provides O dB to 9 dB in increments of 1 dB. Atten-

uator AT2 provides O dB to 60 dB in increments of 10 dB. This pro-

vides a range of O dB to 69 dB by the settings of the respective

switches.

(3) Coax Switches S14 and S15 are controlled by the YIG FILTER IN/OUT

Switch S2 on the control panel. When the switch is in the OUT

position, the coax switch is de-energized and RF is directed

straight through to Directional Coupler DC1. This is the normal

condition when monitoring detected video signals.

(4) When a modulation depth signal is being tested, the YIG FILTER

IN/OUT switch S2 will be in the IN position. This energizes Coax

Switches S14 and S15, directing the RF through YIG filter and

driver and then to Directional Coupler DC1.

(5) Directional Coupler DC1 splits the RF. One path going to VAR RF

OUT Jack J3 at the front of the status panel and the other path

(reduced by 6 dB) going to Detector CR1. The detected video from

CR1 is sent to the DET VIDEO/UUT SIGNAL Switch S3.

(6) The YIG FILTER CONTROL Switch S3 1ocated on Control Panel Assembly

1A1 is used to tune the YIG Filter and Driver FL1 to the F1, F2 and

F3 frequencies as follows:

YIG FILTER CONTROL SETTINGS

FREQUENCY

330

509

688

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