YIG FILTER Control

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

CONTROL AND POWER DISTRIBUTION (Continued)

b. YIG FILTER Control . The BTS contains a microwave bandpass filter of the

Yttrium Iron Garnet (YIG) type.

(1) 115 VAC,

60 Hz, 10 is applied through input power jack J5 to line

filters

FL1 and FL2 which eliminate conductive EMI from the BTS.

Circuit

Breaker CB2, when enabled, supplies input ac power to

Circuit

Breaker CB3.

(2) Circuit Breaker CB3 is a push-to-reset device located on the front

panel of 1A1. When CB3 is enabled ac power is applied to

YIG Filter Power Supplies PS1, PS2 and PS3.

( 3) Power Supply PS1, when enabled, supplies -15 Vdc 1% with an

output current of 0.1 amps to the YIG filter in the status panel

assembly. Power Supply PS2, when enabled, supplies +15 Vdc 1%

with an output current of 1.0 amps to the YIG filter in the status

panel.

(4) POWER Indicator DS3 lights when +15V Power Supply PS2 is enabled.

(5) Power Supply PS3, when enabled, supplies +10 Vdc 1% with an

output current of 0.12 amps to the YIG FILTER CONTROL switch S3.

S3 is a three decade thumbwheel switch used to tune the YIG filter

to the F1, F2 and F3 frequencies.

(6) The +28 Vdc is applied through INPUT POWER jack J6 to line filter

FL3 and FL4 which eliminate conductive EMI from the BTS. Circuit

Breaker CB1, when enabled, supplies heater power to YIG filter

1A2FL1.

(7) YIG FILTER IN/OUT Switch S2 is used to switch the YIG filter in or

out of the RF Path in the status panel.

OUT position - YIG filter bypassed (no insertion loss)

IN position = YIG filter in circuit (used to measure depth of modu-

lation)

(8) Al 1 signals are routed through P4 to status panel connector 1A2J10.

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