TM 11-5805-356-34-1
b. Send Loop Current Test.
Control
Position
ON-OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. OFF
(1) Operate the TH-22/TG front panel controls
115 V AC-230V AC-26V DC Position corresponding to power
as follows:
source being used.
MODE ONE-MODE TWO . . . . . . . ..MODE ONE
NOTE
NORM-REC-SEND . . . . . . . . . . . . . . . . . ..NORM
A control for which no position is specified
4W-2W-TEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..4W
may be left in any position.
(2) Connect AN/USM-459 input to TH-22/TG
Position
Control
ON-OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. OFF
4WS-TEL binding posts. AN/USM-459 should indi-
Position corresponding to power
115V AC-230V AC-26V DC
cate mark frequency (1317.5 Hz).
source being used.
(3) Insert an open plug into TH-22/TG SEND
(2) Connect the TH-22/TG to a power source.
(Use connector PI for ac power, connector J5 for dc
(1232.5 Hz).
power.
(4) Remove plug and depress BREAK-IN
(3) Connect the AN/PSM-45 (set to measure 50
switch. AN/USM-459 should read (1180 Hz).
milliamperes (ma) dc) to SEND jack J1 or J2 by
e. Send Circuit Output Level Test.
means of a telephone plug.
(1) Operate the TH-22/TG front panel controls
(4) Operate the ON-OFF switch to ON.
as follows:
(5) The AN/PSM-45 indicates 16.5 maormore.
NOTE
c. Receive Loop Current Test.
A control for which no position is specified
(1) Operate the TH-22/TG front panel controls
may be left in any position.
as follows:
Control
Position
ON-OFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. OFF
NOTE
115V AC-230V AC-26V DC
Position corresponding to power
A control for which no position is specified
source being used.
may be left in any position.
MODE ONE-MODE TWO . . . . . . . ..MODE ONE
NORM-REC-SEND . . . . . . . . . . . . . . . . . ..NORM
Position
Control
ON-OFF . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .. OFF
4W-2W-TEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..4W
Position corresponding to power
115V AC-230V AC-26V DC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..VF
source being used.
(2) Connect AN/USM-181 input to TH-22/TG
4W-2W-TEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. TEL
4WS-TEL binding posts, AN/USM-181 should read
(2) Connect the TH-22/TG to a power source.
0 dbm).
(Use connector P1 for ac power, connector J5 for dc
(3) Insert open plug into TH-22/TG SEND jack.
power.)
AN/USM-181 should read 0 dbm).
(3) Connect the AN/PSM-45 (set to measure 50
(4) Remove plug depress BREAK-IN switch.
ma) to REC J5 by means of a telephone Plug.
AN/USM-181 should read 0 dbm).
(4) Operate the ON-OFF switch to ON, and note
that the THRESHOLD indicator lights.
(1) Operate the TH-22/TG front panel controls
(5) The AN/PSM-45 indicates 21 ma 2.
as follows:
(6) Insert an open telephone plug into SEND
jack J1 or J2 and operate the 4W-2W-TEL switch to
NOTE
A control for which no position is specified
2W. THRESHOLD indicator lights after approxi-
may be left in any position.
mately 2.5 seconds.
(7) The AN/PSM-45 indicates less than 1.0 ma.
Control
Position
ON-OFF... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. OFF
115V AC-230V AC-26V DC
(1) Operate the TH-22/TG front panel controls
Position corresponding to power
source being used.
as follows:
MODE ONE-MODE TWO . . . . . . . ..MODE TWO
NOTE
NORM-REC-SEND . . . . . . . . . . . . . . . . . ..REC
4W-2W-TEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2W
A control for which no position is specified
may be left in any position.
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