TM 11-6625-3053-14
AR5 is the meter amplifier (Item I . The detected rf signal is fed to the inverting input of AR5 and a positive voltage is
produced at the output and fed through METER CAL potentiometer R16 (Item J to the power monitor meter.
Amplitude Modulation (A.M.) is obtained by adding a modulating signal to the DC level control signal connected to AT1.
A section of the MODULATION switch (Item K ) selects the source of the modulating signal. In the case of A.M., the
signal is obtained from the front panel EXT AM Jack (Item L . When PULSE modulation is selected, the pulse from the
EXT PULSE jack (Item N ) is inverted by pulse amplifier Q2 (Item M ) and connected to the DC level control signal.
When square wave modulation is selected, an internal oscillator AR1 (Item O is used to produce a 950-1050 Hz
square wave. This square wave is amplified by AR2 (Item P ) and Q1 (Item before being connected to the DC level
control line at the modulation switch (Item K . A dual power supply consisting of CR3-CR6, C10, C11, and AR5-AR6
(Item R provides + and -12V DC power on the A3 card for these circuits.
SECTION III. ELECTRICAL CHECK PROCEDURES
6-13.
This section contains a check procedure which determines if the signal generator is operating correctly.
completely, every six months.
on those performance stands which may have been affected as a result of a repair, immediately after the
repair.
on those performance standards which you suspect are not functioning properly, when you suspect them.
The check procedures are in tabular form:
6-12