Section IV
Paragraphs 4-30 to 4-32
129.3 to 135.0 mc from the r-f chassis with 200 mc
the cathcode follower, still proportional to the r-f in-
put to V1509A, is coupled to the meter circuit and
from 200-mc oscillator V1510. The sum frequency at
the output of univerter mixer V1511 is amplified by
AUDIO OUT jack J1408 through an r-f filter (part of
univerter amplifiers V1512 and V1513 and delivered
the filter assembly) that prevents rf from radiating on
the external leads of the r-f chassis.
to the GS OUTPUT jack. The overall gain of the uni-
verter chassis is unity, so that the calibration of the
MICROVOLTS control is true durtng GS operation.
An avc (automatic volume control) circuit keeps the
4-32. INTRODUCTION. During GS operation the out-
overall univerter gain constant over the complete
put of the r-f chassis is connected to the univerter
range of the MICROVOLTS control. Plate voltage is
chassis (figure 4-2). The output frequency now re-
applied to the univerter circuits when the NAV-GS
quired, 329.3 to 335.0 mc, is developed by mixing
switch is set to GS.
