TM 1-1520-238-MTF
2-21
PROCEDURE
TROUBLESHOOTING
REFERENCE
AFTER STARTING APU (CONT)
(c) LOOP L-R control – Adjust
to obtain a maximum
deflection on TUNE meter.
This should be 90 from the
station.
(d) AUDIO control – Adjust for
a reading that is below 3
divisions on the TUNE
meter.
(e) Repeat steps (c) and (d)
until a sharp peak in
reading is obtained.
NOTE
If TUNE meter changes, impedance match-
ing amplifier requires adjustment.
(f) Mode selector – ANT. Note
TUNE meter indication.
(g) ADF – Set as required.
*b. AN/ARN-149 ADF Radio – Test as
follows:
(1) ANT mode operation.
(a) Mode selector – ANT.
(b) HSI No. 2 bearing pointer is
90 from aircraft heading.
