Thales 421, Operation And Maintenance, Page: 72 / 256

LLZ 421
Operation Operation and Maintenance
ILS 420
3−6
Ed. 01.07 SOAC
Board Indicator Color Control Function of control or indicator (lit or flashing)
VAM−ILS
(option)
cont. R3
R4
R5
R6
R7
R8
R9
jack 3.5 mm
Used to adjust the output signal to LG−A/2.
Set such, that with 700 mVrms at X18 the out-
put amplitude is 3.75 Vrms, i.e. 10.6 Vpp for a
maximum modulation depth of 40 %.
Used to set gain of line input pre−amplifier 1:
R4 left: 6 dB, R4 right: 40 dB;
default setting: 0 dB, X30 open.
Used to set gain of the microphone input
pre−amplifier 1; R5 left: 6 dB, R5 right: 40 dB;
default setting: ca. +20 dB, X31 closed.
Used to set buffer gain of microphone input
pre−amplifier 2; default setting: ca. 0 dB.
Used to set VCA gain of microphone input
pre−amplifier 2; default setting: ca. +14 dB;
set X24 for adjustment or check.
Used to set buffer gain of line input pre−am-
plifier 2; default setting: ca. 0 dB.
Used to set VCA gain of line input pre−ampli-
fier 2; default setting: ca. +10 dB; set X23 for
adjustment or check.
Upper (out): used to connect a headphone
Lower (in): used to connect a microphone
INTFC
SNR: 120628
LED (dual) green
red
Hex switch
indicates ident key tone
not supported
Factory use (manual test detector input select)
Ed. 01.10