AN/ARC-5 Handbook

*** at 50,000 microvolts input 
 
2--17. AVC CHARACTERISTICS. 
 
2--18. LIMITS: 
10X Normal sensitivity -- 50 to 150 mw. 
100X Normal sensitivity -- 100 to 200 mw. 
1000X Normal sensitivity -- 200 mw. 
10000X Normal sensitivity -- 200 to 400 mw. 
Note 
Normal sensitivity is that setting of the signal generator output necessary to produce 
10 mw receiver output. 
 
2--19. PRELIMINARY INSTRUCTIONS. Obtain normal sensitivity before starting this check. This 
check may be omitted on R-23 and R-24 navigation...

2--21. TRANSMITTER CHECKS. 
 
2--22. POWER SUPPLY. 
 
2--23. LIMITS: Input voltage 27.5 v dc. 
Secondary voltage 545 v dc. 
 
2--24. PRELIMINARY INSTRUCTIONS: Use Test Set, AN/GRM-1, as shown in figure 1--3. Apply d-c  
power and allow time for the equipment to warm up. Depress the test key when recording all tests. 
 
2--25. TEST PROCEDURE. 
 
STEP C-29/ARC-5 
CONTROL 
BOX OPERATION TS-
58/GRM-1 
READS VOLTMETER 
VALUES POSSIBLE 
CAUSES 
OF 
ABNORMAL 
IND. 1 Select 
transmitter 1 or 
2 
corresponding...

2--26. TRANSMITTER TRACKING AND LOADING. 
 
2--27. LIMIT: Phantom Antenna Plate Current: 
 TS-58/GRM-1, pos. 5 
Current No load (zero 
coupling)  10  25 ma Loaded-MCW-VOICE  20-40  50-100 ma Loaded-CW  60-80  150-200 ma  
Frequency Calibration: 
Within 0.03% of dial reading at any frequency, except at crystal frequency, where tolerance b 0.05%. 
**** 
R-F Power Output:CW emission--2.25 amps minimum (25 watts) 
VOICE emission--l.61 amps minimum (13 watts) unmod. 
TONE emission--1.85 amps minimum (17...

2--28. TEST PROCEDURE. 
STEP TRANSMITTER 
CONTROLS  OPERATION  NORMAL 
INDICATION  ABNORMAL 
INDICATION  1 Select and 
switch on 
transmitter 1 or 
2 depending on 
position in rack. 
Switch to CW. 
Unlock all 
transmitter 
controls. Set 
COUPLING 
and ANT. 
INDUCTANCE 
at zero. Set TS-58/GRM-
I switch to 
position 5. Set 
transmitter dial 
to the lowest 
frequency. 
Observe TS-58 
GRM-1 meter 
while tuning 
transmitter dial 
throughout its 
range. TS-58/GRM-1 
meter reading 
should not exceed 
10 through...

9 Lock all controls except coupling control.  
2--29. MODULATION CHECK. 
 
2--30. PRELIMINARY INSTRUCTIONS: 
Modulation capabilities of the transmitter are determined by use of the oscilloscope, displaying a 
modulation envelope type of pattern. In addition to the normal oscilloscope control settings, the 
following should be observed: 
Oscilloscope Settings--Vertical input to plates direct. Sync control to EXTERNAL. 
Oscilloscope Connections-Sync voltage is obtained from one of the phone jacks in...

SUMMARY TEST DATA CHECK OFF SHEET 
AN/ARC-5 
Antenna Relay__________Mike Jack___________Phone Jack___________Dynamotor Ripple 
___________ 
Calibration (.08%)__________Vibration____________Align Input__________Dyn. Overhaul 
Date_________ 
Max. Band Noise .19-.55mc .52-1.5mc 1.5-3.0mc 3.0-6.0mc 6.0-9.1mc 
(15 mw) ________ ________ ________ ________ _________SENSITIVITY HIGH END LOW END 
AVC CHARACTERISTICS 
(7uv) CW MCW INPUT OUTPUT 
RATIO LIMITS 
.19-.55mc _________________ _________________ NOR. SENS....

SECTION III ALIGNMENT PROCEDURE 
 
3--1. RECEIVER ALIGNMENT.  
Figure 3-1. Receiver Alignment Connections  
Figure 3-2. Location of Trimmers, Typical Receiver  

3--2. PRELIMINARY INSTRUCTIONS.Output Meter--Daven, Model OP-182, connected into headset jack on 
receiver rack; IMPEDANCE SELECTOR set at 300 ohms.  
Signal Generator--LP-5 or Hickok 19X connected between the point indicated on alignment chart and ground. 
Controls-Set gain control at maximum, emission to MCW, signal generator switch ON, and dial as indicated in 
chart. 
Output Level--During alignment, the signal generator output must be attenuated to maintain the receiver output 
at 10 mw as indicated...

3 Same Use MOD 
RF.  .52 mc 
1.4 mc  
2.9 mc  
5.8 mc  
8.9 mc  R-23 
R-24 
R-25 
R-26 
R-27  .52 mc 
1.4 mc  
2.9 mc  
5.8 mc  
8.9 mc  Switch to MCW. 
Adjust oscillator 
trimmer for 
maximum output 
meter reading. C-4E 4 Through .006 
mfd capacitor to 
ANT post.  Same  
  Same  Adjust R-F 
trimmer and 
ALIGN INPUT 
trimmer for 
maximum 
output.  C-4D  
C-2 5 Same  Same  
  Same  Adjust oscillator 
trimmer for 
maximum 
output. C-4E 6 Same  
.21 mc  
.57 mc  
1.55 mc  
3.1 mc  
6.1 mc R-23 
R-24 
R-25...

Figure 3-3. Transmitter Alignment Connections)  
Figure 3-4. Transmitter Adjustment Points (Top)  
Figure 3-5. Transmitter Adjustment Points (Bottom)