Kenwood TM-221A Service Manual page 33

TM-221A/E/ES
ADJUSTMENT |
REQUIRED TEST EQUIPMENT
1.
2.
10.
11,
12,
13.
14.
DC V.M
1) High input impedance
RF VTVM (RF V.M)
1) Input impedance : 1MQ min., 2pF max.
2) Voltage range : F.S = 10mV ~ 300V
3) Frequency range: Up to 450MHz
Frequency Counter (f. counter)
1) Input sensitivity : Approx. 50mV
2) Frequency range : Up to 450MHz
DC Power Supply
1) Voltage : 10V ~ 17V, variable
2) Current : 6A min.
Power Meter
1) Measurement range Approx. : 30W, 3W, 1W
2) Input impedance : 502
3) Frequency range : 450MHz
AF VTVM (AF V.M)
1) Input impedance : 1MQ min.
2) Voltage range : F.S = ImV ~ 30V
3) Frequency range : 50Hz ~ 10kHz
AF Generator (AG)
1) Output frquency : 100Hz ~ 10kHz
2) Output voltage : 0.5mV ~ 1V
Linear Detector
1) Frequency range : 450MHz
Field Strength Meter
1) Frequency range : 450MHz
Directional Coupler
Oscilloscope
1) High sensitivity oscilloscope with horizontal input
terminal
SSG
1) Frequency range: 144MHz.
2) Modulation : AM and FM MOD.
3) Output level : —20dB to 100dB
Dummy Load
1) 89, 50W (approx.)
Noise Generator
1) Must generate ignition-like noise containing har-
monics beyond 450MHz.
15. Sweep Generator
1) Sweep range : 1440MHz and 430MHz bands
16. Tracking generator
PREPARATION
1) Unless otherwise specified, knobs and switches should
be set as follows Table 7.
POWER SW SHIFT SW
AF VOL VR
MIN. | REV SW
OFF
SCAN SW.
CTCSS SW (K,M)
ALERT SW (TW)
Table 7
Mic (@) @ GND (mic)
ss Q) ©
DOWN @) © 8m
GND @ uP
Fig. 18 MIC terminals (view from front panel side)
2) Use an insulated adjusting rod to adjust trimmers and
coils. ;
3) To prevent damaging SSG, never connect the micro-
phone to mic jack while adjusting the receiver section.
4) Be sure to turn the power switch OFF, before connect-
ing the power cable to a power source.
5) SSG output levels are those at the time the output
terminal is open.
6) Meter and display section should be set as follows
Fig. 19.
VFO/M__M.IN MHz KENWOOD
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