TB 9-6625-1998-35
(10) Position controls on SWR meter as listed in (a) through (d) below:
(a) INPUT switch to HIGH.
(b) RANGE switch to 30.
(c) FREQ adjust for peak indication on meter.
(d) GAIN/VERNIER control for 1 dB on SWR meter.
(11) Set ATTENUATOR switch to X100 V. SWR meter will indicate between 9.6
and 10.4 dB down from value established in (10)(d) above.
(12) Set ATTENUATOR switch to X10 V. SWR meter will indicate between 17
and 21.5 dB down from value established in (10)(d) above.
b. Adjustments
(1) Set ATTENUATOR switch to X10 V and OUTPUT CONTROL fully cw.
NOTE
For AN/URM-127, perform (2) through (4) below.
For
AN/URM-127A, perform (5) through (7) below.
(2) Adjust R2 (fig. 1) until OUTPUT RMS meter indicates 1.15 (R).
(3) Adjust OUTPUT CONTROL until audio analyzer indicates 10 V.
(4) Adjust R29 (fig. 1) until OUTPUT RMS meter indicates 1.0 (R).
(5) Adjust A2R5 (fig. 2) until audio analyzer indicates 12.0 V ac (R).
(6) Adjust OUTPUT CONTROL until audio analyzer indicates 10.0 V ac.
(7) Adjust A2R12 (fig. 2) until VOLTS RMS meter indicates 1.0 (R).
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