AN/ARC-5 Handbook

1  FT-227-A MT-70/ARC-5 Mounting for MT-71/ARC-5 
Radio transmitter rack 1  FT-225-A MT-76/ARC-5 Mounting (modulator) 1  FT-229-A MT-77/ARC-5 Mounting (antenna relay unit) 1 Mounting Plate FT-228-A MT-80/ARC-5 Mounting (transmitter control 
C-29/ARC-5 or C-50A/ARC-5) 1  FT-222-A MT-98/ARC-5 Mounting (Receiver control C-
43/ARC-5) 1 Mounting Rack FT-277-A MT-63/ARC-5 Rack for two radio receivers 1  
  MT-71/ARC-5 Rack for two radio transmitters 1 Test Unit I-104-A 
  Test unit for radio receivers 1  TS-...

 
Figure 1-4. Cable Assemblies CD 532 and CD 528  

 
Figure 1-5. Cable Assemblies CD 531 and CD 525  

 
Figure 1-64. Cable Assemblies CX-31/GRM-1 and CS-32/GRM-1  

 
Figure 1-74. Cable Assembly CD 527  

NOTES 
 
1. If Antenna relay unit RE-2/ARC-5, being tested, does not have a series capacitor, connect the 
transmitter to TRANS. Connect ANT of the antenna relay unit to terminal A, instead of to terminal 
5, of antenna A-61-A. 
 
2. Test Unit I-104-A normally is used with adapter cord CD-706 as shown. It may be used by attaching 
cord CD-532 to either position of the receiver rack and when so employed, the meter will not indicate 
when the meter switch is in position four or five. Volume control on AVC...

SECTION II PERFORMANCE CHECKS 
 
2--1. GENERAL. 
 
2--2. These PERFORMANCE CHECKS are to be made in the order given; when a performance 
requirement is not met, a reference is made to the appropriate voltage measurement or signal tracing 
procedure in TROUBLE ISOLATION. ALIGNMENT PROCEDURES are included, but are to be used 
only as directed in TROUBLE ISOLATION. Signal tracing techniques are used after voltage readings 
have been found to be normal. The standard maintenance manual should be referred to...

2--8. TEST PROCEDURE.  
STEP HEAD 
TEST 
SET METER 
SW CIRCUIT 
MEASURED NORMAL 
VALUES NORMAL 
METER 
INDIC. ABNORMAL 
METER INDIC. 1 I-I04-
A 1 Input voltage 27.5 v 56 2 I-I04-
A 2 Input current 1.4-1.7 a 14-17 3 I-I04-
A 3 Plate supply 230-250 v 46-50 4 I-I04-
A 4 Screen 
supply 76-100 v 38-50 5 I-I04-
A 5 Cathode 
current RF 
and 1st IF 
tubes 11-15 ma 44-60 Refer to 
TROUBLE 
ISOLATION 
PROCEDURE, 
Section IV, 
Paragraph 4-1.  
2--9. BAND NOISE.  
 
2--10. LIMITS: (Less than 15 milliwatts.)...

2--12. SENSITIVITY.  
 
2--13. LIMITS. Less than 10 uv R-F input to obtain 10 mw audio output with INCREASE OUTPUT 
control set at maximum.  
 
2--14. TEST PROCEDURE.  
STEP RECEIVER 
SETTINGS SIG. GEN 
CONNECTIONS OUTPUT INDIC. 
& 
CONNECTIONS NORMAL 
INDICATION POSSIBLE 
CAUSES OF 
ABNORMAL 
IND. 1 FREQUENCY 
at high end; 
MCW 
operation: 
INCREASE 
OUTPUT 
control at 
maximum. Through .006 
mfd capacitor, 
to receiver 
Antenna post. 
Set frequency to 
agree with 
receiver. Output meter, 
OP-182, and...

2--15. SELECTIVITY. 
 
2--16. PRELIMINARY ADJUSTMENTS: Set the Model 695 output meter to the 1.5 volt range. Connect 
a 300-ohm one-half or one watt composition resistor in parallel with the output meter; connect output 
meter to receiver phone jack. Set the receiver INCREASE OUTPUT control to full counterclockwise 
position. Tune the receiver and the signal generator to the proper frequency, as given in Table below. 
Adjust the signal generator attenuators for 50 microvolts output, 30 per cent modulated...