Section IV
Paragraphs 4-69 to 4-70
c. TONE LOC. 90 cps and 150 cps from the LOC-GS
attenuator are fed to S1402B. Switch section S1402C
(See figure 4-24.)
again grounds the 30 cps variable phase signal and
section S1402D (figure 4-16) disables the 9960 cps
LECTOR switch sections S1402B and S1402A and a-f
d. GLIDE SLOPE. Same as in TONE LOC except
amplifier V1408B. All the audio signals produced by
signal amplitude is greater.
the audio chassis are fed to these two switch sections
e. 1000~. 1000 cps from V1407A is fed to S1402A
and are mixed, amplified by V1408B, an amplifier
rear. Switch section S1402C again grounds the 30
common to all audio signals, and fed to the r-f chas-
cps variable phase signal and S1402E disables the 90
sis. The audio signals are selected as follows:
cps and 150 cps circuit.
a. VOR. 9960 cps frequency modulated at 30 cps
30 cps variable phase from V1401A
f. 30~ VAR
from V1407A is fed to S1402A rear and 30 cps vari-
is coupled through R1444 to S1402B. Switch section
able phase from V1401A is coupled through R1444 to
S1402D disables the 9960 cps oscillator and S1402E
S1402B. Switch section S1402E (figure 4-22) disables
disables the 90 cps and 150 cps circuit.
the 90 cps and 150 cps circuit.
b. LOC. 9960 cps frequency modulated at 30 cps
g. 9960 FM. 9960 cps frequency modulated at 30
cps from V1407A is fed to S1402A rear. Switch sec-
from V1407A is fed to S1402A rear and 30 cps revers-
ible phase from its phase shifting network is fed to
tion S1402C grounds the 30 cps variable phase signal.
R1444 prevents the 9960 cps signal from being
S1402B. Switch section S1402C (figure 4-23) grounds
grounded at the same time. Switch section S1402E
the 30 cps variable phase signal and S1402E disables
disables the 90 cps and 150 cps circuit.
the 90 cps and 150 cps circuit.
