TM 11-6625-3053-14
STEP
OPERATION
NORMAL INDICATION
CORRECTIVE ACTION
Make sure ATTENUATOR dial
still shows 50 dBm in center of
window.
Set POWER SET/AUTO CAL
control so that ATTENUATOR
hairline is on 58 dBm on the
already set ATTENUATOR dial.
Carefully move the POWER SET
probe keeping it oriented with
ground stub vertical in very small
steps until you obtain the -7 dBm
on the external power meter.
Move the probe toward the cavity
for more power, away from the
cavity for less power.
When the -7 dBm is obtained,
tighten set screws on POWER
SET PROBE and deenergize the
sig gen.
Disconnect the ext power meter.
Reconnect P2 to J2 on the A5
assembly.
If alinement ends here reas-
semble the tuning head assy onto
Adjust ALC SET control (R1) fully clockwise and Modulation Switch to RF OFF.
Wait 2 mins. and set MODULATION switch to CW.
Set attenuator control so that attenuator reading of 50 is in the center of the window. Set hairline at -
58.
Adjust A3R16 for a -1 dBm deflection on POWER MONITOR METER.
The POWER MONITOR METER is now calibrated.
7
CALIBRATION OF ATTENUATOR OUTPUT With tuning head still to right of main frame:
Deenergize sig gen.
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