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Adjustment Procedures.
Up
TM-11-5825-270-23 Monitor Radio Frequency R-2176/FRN (NSN
Next
Chapter 3. FUNCTIONING OF EQUIPMENT


TM 11-5825-270-23
above.  The rms voltmeter may be
the alarm volume is satisfactory.
connected directly across TB1 (1-2).
(25) Silence aural alarm by momentarily
pressing the ALARM SIL switch.
NOTE
(26) Using the multimeter, check the state of
The maximum output level at TB1 (1-
alarm contacts at TB1 (at rear of the unit): Contacts 5-4
2) is 250 mW.  This equals 12.25 V
of TB1 must be open circuit and contacts 4-3 must be
rms into 600 ohms.
closed (shorted).
(27) Slowly turn SENSITIVITY control R7
(29) Close the front panel and turn the latch
clockwise until the CARRIER LEVEL meter reading is 1
so that it engages.
dB greater than the trip level set in (22) above. Check to
(30) Set power ON/OFF switch to OFF.
see that the receiver reverts back to normal operation
(NORM light on and ALARM light off). Now adjust R7 for
Table 2-2. Relationship Between RF Tune Control and
0 dB reading on the CARRIER LEVEL meter.
Operating Frequency
NOTE
When performing (27) above note
DIAL
DIAL
KHZ
SETTING
KHZ
SETTING
that receiver cannot revert back to
190
10
360
81
normal operation during the pause
200
20
370
82
between code transmissions.  The
210
29
380
83
SENSITIVITY  control  R7  should
220
38
390
84
therefore be adjusted during the
230
43
400
85
keying sequence.
240
47
410
86
250
51
420
87
(28) Connect a 600 ohm, 1W resistor across
260
55
430
88
TB1 (1-2) and connect an rms voltmeter across the
270
58
440
89
280
62
450
90
resistor. Check that meter reads 12.25 V rms (0.1 V).
290
66
460
91
If this reading is not correct, adjust AUDIO LEVEL
300
69
470
92
potentiometer R14 on the IF PCB for 12.25 V rms
310
72
480
93
(0.1V) on the volt-meter.
320
74
500
94
330
76
520
95
NOTE
340
78
535
96
If TB1 (1-2) is terminated into a 600
350
80
ohm line, do not install the 600 ohm
1W resistor as specified in (28)
2-6


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