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INDEX TO TEST POINTS
NOTE:
Waveforms are measured with a Tektronix 211 or equivalent;
voltages are measured with a Simpson 260 or equivalent. All
measurements are made with respect to ground.
CIRCUIT:
AM oscillator PWB Output and Driver PWB Input.
TEST POINT: TP4 (blue) on Driver PWB.
MODE:
S1 on Recycle PWB in CONT. Shutdown switch OFF.
rated power into dummy load or antenna.
Full
INDICATION
REMARKS
ACTION
Waveforms
DC Voltages
+ 12 to +14.5 V
Normal.
100% modu-I
lation. Peak-to-peak
voltages will vary
according to drive
requirements
of
individual transmit-
ters. Vp_p. Up to 25
volts normal.
Drive level too high.
Less than 100% modu-
lation.
Normal.
Reduce
power
by
turning
RF
DRIVE
control on AM Oscil-
lator PWB CCW.
Adjust R3 on the AM
Oscillator PWB for
100% modulation.
118
Southern Avionics
Company
SS-800AVS
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