TM 11-5805-424-15/NAVELEX 0967-220-9010/TO 31W2-2G-41
delay before the ME-26A/U indicates +6
(10) Adjust the OUTPUT LEVEL ADJ control
volts.
for a -12-dbm indication on the ME-
30A/U; the ME-26A/U should indicate -6
(8) If the +6-volt indication does not occur
volts, immediately.
exactly 2 seconds after the alarm
condition occurs, adjust the 350D
Note.
The alarm condition (+6 volts
attenuator for a -10-dbm indication on the
indication on ME-26A/U) must occur 2
ME30A/U; then rotate the REC CARRIER
seconds after the output level has
ALARM TIME control slightly (clockwise if
decreased 10 dbm from normal. If an
the delay time is too long; counterclock-
output level other than -7 dbm is to be
wise if the time is too short) and repeat
used, obtain the alarm condition by
the procedure in (4) above.
decreasing that output level by 10 dbm,
and remove the alarm condition by then
(9) Continue to perform the procedures in (8)
raising the output level by 5 dbm. For
and (4) above until the ME-26A/U
example, if the desired output level is 0
provides a +6-volt indication exactly 2
dbm, the alarm condition should occur at -
seconds after the input level is decreased
10 dbm, and reset at -5 dbm. Do not set
to -30 dbm.
the output level for less than -10 dbm or
(10) Adjust the 350D attenuator for a -20 dbm
an alarm condition will never be reached.
indication on the ME-30A/U; the ME-
c. Receiver Carrier Alarm Adjustments.
26A/U should indicate -6 volts immedi-
ately.
(1) Connect the ME-26A/U between test point
Note.
The alarm condition (+6 volts
TP5 on the control shelf (fig. 2-3) and
ground.
indication on the ME-26A/U must occur 2
seconds after the input level has
(2) Connect the BALANCED TRANSMIT
decreased 20 dbm from normal. If an
CARRIER OUTPUT terminals (13 and 14
input level other than -10 dbm is to be
on TB2 at the rear of the equipment, fig.
used, obtain the alarm condition by
decreasing the input level by 20 dbm, and
BALANCED RECEIVE CARRIER INPUT
remove the alarm condition by then
terminals (15 and 16 on TB2).
increasing the input level by 10 dbm. For
(3) Connect the ME-30A/U to terminals 15
example, if the desired input level is -6
and 16 on TB2, and adjust the 350D
dbm, the alarm condition should occur at -
attenuator for a -10-dbm indication on the
26 dbm and reset at -16 dbm.
ME-30A/U.
d. No-Transition Alarm Send.
Note. This is a normal input level value
(1) Connect the ME-26A/U between test point
and should be used as much as possible.
TP2 on the control shelf (fig. 2-3) and
Never can the receive input level be less
ground; the ME-26A/U should indicate -
than -15 dbm.
3.84 volts approximately.
(4) Adjust the 350D attenuator for a -30-dbm
(2) Set the INPUT SELECT switch to OFF
indication on the ME-30A/U (alarm
(alarm condition), and check for a 5-
condition); the ME-26A/U should indicate
second delay before the ME-26A/U
+6 volts after the -30-dbm level is
indicates +6 volts.
reached.
(3) If the +6-volt indication does not occur
(5) If the ME-26A/U does not indicate +6
exactly 5 seconds after the alarm
volts, adjust the REC CARRIER ALARM
condition occurs, set the INPUT SELECT
THRESHOLD control (fig. 2-3) until the
switch to DATA; then adjust the
ME-26A/U indicates +6 volts.,
TRANSITION ALARM TIME TRANSMIT
(6) Set the input level to -10-dbm level, as
control, on the control bracket, slightly
indicated by the ME-30A/U , and connect
(clockwise if the time delay is too long;
the ME-26A/U between test point TP6 (fig.
counterclockwise if the time delay is too
short) and repeat the procedure in (2)
indicate approximately -6 volts.
above.
(7) Adjust the 350D attenuator for a -30-dbm
(4) Continue to perform the procedures in (3)
output level, and check for a 2-second
and (2) above until the ME-26A/U
Change 6
8-3
