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service instructions


Table 4-1. Transmitter Signal Levels.
 
SIGNAL GENERATOR
CONNECTION POINT
BAND-SWITCH
POSITION
SIGNAL GENERATOR
FREQUENCY
SIGNAL GENERATOR
OUTPUT VOLTAGE
For the following, short J16 to ground, peak EXCITER TUNING ior each band, and measure at test point with vtvm
V6-3 (grid)
 
 
 
 
V5-2 or 7Wiper of R15
3.0
7.0
14.0
21.2
28.5
VFO set at 100
Any
  1.0 to 1.8 volts
1.0 to 1.4 volts
1.0 to 1.4 volts
1.0 to 1.4 volts
1.0 to 1.4 volts
1.0 to 1.4 volts
1.0 to 1.4 volts
* frequency of internal tone osclllator.

lead from the power supply. Set meter switch to GRID. Peak EXCITER TUNING, and turn VOX CAIN control full counterclockwise. Short PTT jack J16 to ground to key the KWM-2/2A to transmit. connect signal generator output to points indicated in table 4-1, and adjust signal generator output attenuator until pa grid current just begins to show on the meter. Attenuator reading is signal voltage necessary at that point. Voltages given in the table are norninal and may vary 20 percent. Each time, be careful to set signal generator to frequency shown in the table. Oscillator output voltage may be measured with a vacuum-tube voltmeter.

  4.3 RECEIVER SIGNAL TRAClNG

Table 4-2 lists significant test points and normal signal levels. Figure 4-1 shows location of test points and adjustments. All rf and 1f measure-ments were made be connecting a vacuum-tube voltmeter ts the AVC bus and increasing signal generator output until the AVC threshold is reached. The AVC threshold voltage is the point at which the dc vtvm indcation just chang es with increased signal level. The receiver was tuned to 14.1 MHz for these measurements, and a test signal injected at indicated test points. Signal voltage valucs are taken from signal generator output attenua

Table A-2. Receiver Signal Levels

TEST POINT
FREQUENCY
VOl.TAGE
TEST POINT
FREQUENCY VOLTAGE
V1SB-8
 
V15B-9
 
V3B-6
V1B-6
V17B-9
V17B-8
455 kHz
 
455 kHz
 
455 kHz
 
455 kHz
2.5-2.7 MHz
3.055 MHz
1.1 volts
 
* 1 ,4 voIts
 
8000 microvolts
 
220 microvolts
*0.6 volt
180 microvolts
V1313-8
 
 
 
V13B-9
V7-1
J2 (RCVR ANT
or
J1 (RF OUT)
High-frequency
osclllator
Injectlon slgnal
(17.155 MHz)
14.1 MHz
14.1 MHz
14.1 MHz
*1.8 to 3.0 volts
 
 
 
55 microvolts
 
6.5 microvolts
 
2.3 mlcrovolls
* Oscilator Injectlon voltage, measured wlth rf vacuum-tube voltmeter.

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